Att G20_Surgical Site Infection

G20. Surgical Site Infection.pdf

The National Healthcare Safety Network (NHSN)

Att G20_Surgical Site Infection

OMB: 0920-0666

Document [pdf]
Download: pdf | pdf
Procedure-associated Module
SSI

Surgical Site Infection (SSI) Event
Introduction: In 2010, an estimated 16 million operative procedures were performed in acute
care hospitals in the United States1. A recent prevalence study found that SSIs were the most
common healthcare-associated infection, accounting for 31% of all HAIs among hospitalized
patients2. The CDC healthcare-associated infection (HAI) prevalence survey found that there
were an estimated 157,500 surgical site infections associated with inpatient surgeries in 20113.
NHSN data included 16,147 SSIs following 849,659 operative procedures in all groups
reported, for an overall SSI rate of 1.9% between 2006-20084. A 19% decrease in SSI related
to 10 select procedures was reported between 2008 and 20135.
While advances have been made in infection control practices, including improved operating
room ventilation, sterilization methods, barriers, surgical technique, and availability of
antimicrobial prophylaxis, SSIs remain a substantial cause of morbidity, prolonged
hospitalization, and death. SSI is associated with a mortality rate of 3%, and 75% of SSIassociated deaths are directly attributable to the SSI6.
Surveillance of SSI with feedback of appropriate data to surgeons has been shown to be an
important component of strategies to reduce SSI risk7-10. A successful surveillance program
includes the use of epidemiologically-sound infection definitions and effective surveillance
methods, stratification of SSI rates according to risk factors associated with SSI development,
and data feedback8,9. A new CDC and Healthcare Infection Control Practices Advisory
Committee guideline for the prevention of surgical site infection is scheduled for publication
soon, and will replace the previous Guideline for Prevention of Surgical Site Infection, 199910.
Settings: Surveillance of surgical patients will occur in any inpatient and/or outpatient setting
where the selected NHSN operative procedure(s) are performed.
Requirements: Perform surveillance for SSI following at least one NHSN operative
procedure category (ICD-10-PCS and CPT Mapping) as indicated in the Patient Safety
Monthly Reporting Plan (CDC 57.106). Collect SSI (numerator) and operative procedure
category (denominator) data on all procedures included in the selected procedure categories for
at least one month to meet NHSN requirements, or as otherwise specified by mandates and
other reporting requirements. A procedure must meet the NHSN definition of an operative
procedure in order to be included in the surveillance. All procedures included in the NHSN
monthly surveillance plan are followed for superficial, deep, and organ/space SSIs.
SSI monitoring requires active, patient-based, prospective surveillance. Post-discharge and
ante-discharge surveillance methods should be used to detect SSIs following inpatient and
outpatient operative procedures. These methods include: 1) direct examination of patients’
wounds during follow-up visits to either surgery clinics or physicians’ offices, 2) review of
medical records or surgery clinic patient records, 3) surgeon surveys by mail or telephone, and
4) patient surveys by mail or telephone (though patients may have a difficult time assessing
January 2016

9-1

Procedure-associated Module
SSI

their infections). Any combination of these methods is acceptable for use; however, CDC
criteria for SSI must be used. To minimize Infection Preventionists’ (IPs) workload of
collecting denominator data, operating room data may be downloaded (See file specifications
at: http://www.cdc.gov/nhsn/PDFs/training/ImportProcedureData8.5.pdf).
An SSI will be associated with a particular NHSN operative procedure and the facility in
which that procedure was performed. Refer to the NHSN application’s Help system for
instruction on linking an SSI to an operative procedure.
The International Classification of Diseases, 10th Revision Clinical Modifications (ICD-10CM/PCS) codes, which are defined by the ICD-10 Coordination and Maintenance Committee
of the National Center for Health Statistics and the Centers for Medicare and Medicaid
Services (CMS), are developed as a tool for classification of morbidity data. Their wide use
enables the grouping of surgery types for the purpose of determining SSI rates. The ICD-10PCS mapping is located on the NHSN website in the SSI Protocol under “Supporting
Materials”. NHSN has also mapped Current Procedural Terminology (CPT) codes to NHSN
operative procedure categories to assist users in determining the correct NHSN code to report
for facilities which use CPT codes. The CPT NHSN operative procedure mapping is also
found in the “Supporting Materials” section of the SSI Protocol on the NHSN website. Both
the ICD-10-PCS and the CPT codes include a general description of the types of operations
contained in the NHSN operative procedure categories.
Notes:
 The Infection Window Period, Present on Admission, Hospital Associated Infection
and Repeat Infection Timeframe definitions should not be applied to the SSI protocol.
 ICD-10-PCS and CPT code fields remain as optional fields in 2016.
 ICD-10-PCS and CPT codes do not differentiate between spinal fusions (FUSN) and
repeat spinal fusions (RFUSN). Therefore the NHSN procedure group FUSN will
include both fusion and re-fusion procedures and the RFUSN category should not be
used for procedures performed on or after October 1, 2015.
 The NHSN Category “OTH” will not be mapped to ICD-10-PCS and CPT codes. Any
infections associated with procedures in that group will not be considered an NHSN
surgical site infection, beginning with October 1, 2015 procedures.
Definition of an NHSN Operative Procedure
An NHSN Operative Procedure is a procedure:
 that is included in the ICD-10-PCS or CPT NHSN operative procedure code mapping.
And
 takes place during an operation where at least one incision (including laparoscopic
approach) is made through the skin or mucous membrane, or reoperation via an
incision that was left open during a prior operative procedure
And

January 2016

9-2

Procedure-associated Module
SSI



takes place in an operating room (OR), defined as a patient care area that met the
Facilities Guidelines Institute’s (FGI) or American Institute of Architects’ (AIA)
criteria for an operating room when it was constructed or renovated11. This may include
an operating room, C-section room, interventional radiology room, or a cardiac
catheterization lab.

Exclusions: Otherwise eligible procedures that are assigned an ASA score of 6 are not eligible
for NHSN SSI surveillance
Note: Incisional closure method is NOT a part of the NHSN operative procedure definition; all
otherwise eligible procedures are included, regardless of closure type. Therefore both
primarily closed procedures and those that are not closed primarily should be entered into the
denominator data for procedures in the facility’s monthly reporting plan. Any SSIs attributable
to either primarily closed or non-primarily closed procedures should be reported.
NHSN Operative Procedure Category Mappings to ICD-10-PCS and CPT Codes:
ICD-10-PCS and CPT Code Mappings to NHSN Operative Procedures
Denominator for Procedure Definitions:
ASA physical status: Assessment by the anesthesiologist of the patient’s preoperative physical
condition using the American Society of Anesthesiologists’ (ASA) Classification of Physical
Status12,13. Patient is assigned one of the following:
1. A normally healthy patient
2. A patient with mild systemic disease
3. A patient with severe systemic disease
4. A patient with severe systemic disease that is a constant threat to life
5. A moribund patient who is not expected to survive without the operation.
Note: Do NOT report procedures with an ASA physical status of 6 (a declared brain-dead
patient whose organs are being removed for donor purposes) to NHSN.
Date of event (DOE): For an SSI the date of event is the date when the first element used to
meet the SSI infection criterion occurs for the first time during the surveillance period.
Synonym: infection date.
Diabetes: The NHSN SSI surveillance definition of diabetes indicates that the patient has a
diagnosis of diabetes requiring management with insulin or a non-insulin anti-diabetic agent.
This includes patients with “insulin resistance” who are on management with anti-diabetic
agents. This also includes patients with a diagnosis of diabetes who are noncompliant with
their diabetes medications. The ICD-10-CM diagnosis codes that reflect the diagnosis of
diabetes are also acceptable for use to answer YES to the diabetes field question on the
denominator for procedure entry. These codes are found on the NHSN website in the SSI
January 2016

9-3

Procedure-associated Module
SSI

section under “Supporting Materials”. The NHSN definition excludes patients with no
diagnosis of diabetes. The definition also excludes patients who receive insulin for
perioperative control of hyperglycemia but have no diagnosis of diabetes.
Duration of operative procedure: The interval in hours and minutes between the
Procedure/Surgery Start Time, and the Procedure/Surgery Finish Time, as defined by the
Association of Anesthesia Clinical Directors (AACD)14:
 Procedure/Surgery Start Time (PST): Time when the procedure is begun (e.g., incision
for a surgical procedure).
 Procedure/Surgery Finish (PF): Time when all instrument and sponge counts are
completed and verified as correct, all postoperative radiologic studies to be done in the
OR are completed, all dressings and drains are secured, and the physicians/surgeons
have completed all procedure-related activities on the patient.
Emergency operative procedure: A nonelective, unscheduled operative procedure. Emergency
operative procedures are those that do not allow for the standard immediate preoperative
preparation normally done within the facility for a scheduled operation (e.g., stable vital signs,
adequate antiseptic skin preparation, etc.).
General anesthesia: The administration of drugs or gases that enter the general circulation and
affect the central nervous system to render the patient pain free, amnesic, unconscious, and
often paralyzed with relaxed muscles. This does not include conscious sedation.
Height: The patient’s most recent height documented in the medical record in feet (ft) and
inches (in.), or meters (m).
NHSN Inpatient Operative Procedure: An NHSN operative procedure performed on a patient
whose date of admission to the healthcare facility and the date of discharge are different
calendar days.
NHSN Outpatient Operative Procedure: An NHSN operative procedure performed on a patient
whose date of admission to the healthcare facility and date of discharge are the same calendar
day. Procedures performed at an ASC should be designated as outpatient procedures.
Non-primary Closure is defined as closure that is other than primary and includes surgeries in
which the skin level is left completely open during the original surgery and therefore cannot be
classified as having primary closure. For surgeries with non-primary closure, the deep tissue
layers may be closed by some means (with the skin level left open), or the deep and superficial
layers may both be left completely open. An example of a surgery with non-primary closure
would be a laparotomy in which the incision was closed to the level of the deep tissue layers,
sometimes called “fascial layers” or “deep fascia,” but the skin level was left open. Another
example would be an “open abdomen” case in which the abdomen is left completely open after
the surgery. Wounds with non-primary closure may or may not be described as "packed” with

January 2016

9-4

Procedure-associated Module
SSI

gauze or other material, and may or may not be covered with plastic, “wound vacs,” or other
synthetic devices or materials.
Primary Closure is defined as closure of the skin level during the original surgery, regardless
of the presence of wires, wicks, drains, or other devices or objects extruding through the
incision. This category includes surgeries where the skin is closed by some means. Thus, if
any portion of the incision is closed at the skin level, by any manner, a designation of primary
closure should be assigned to the surgery.
Note: If a procedure has multiple incision/laparoscopic trocar sites and any of the incisions are
closed primarily then the procedure technique is recorded as primary closed.
Scope: An instrument used to visualize the interior of a body cavity or organ. In the context of
an NHSN operative procedure, use of a scope involves creation of several small incisions to
perform or assist in the performance of an operation rather than use of a traditional larger
incision (i.e., open approach). Robotic assistance is considered equivalent to use of a scope for
NHSN SSI surveillance. See also Instructions for Completion of Denominator for Procedure
Form and both Numerator Data and Denominator Data reporting instructions in this chapter.
Note: If a scope site has to be extended for hand assist or removal of specimen this will still
meet scope = Yes. If the procedure is converted to an open procedure it will be scope = No.
Secondary BSI Attribution Period for SSI: The secondary BSI attribution period for SSI is a
17-day period that includes the date of event, 3 days prior and 13 days after. For detailed
instructions on determining whether identification of an organisms from a blood specimen
represents a secondary BSI, refer to the Secondary BSI Guide (Appendix 1 of the BSI Event
Protocol).
Trauma: Blunt or penetrating injury occurring prior to the start of the procedure.
Weight: The patient’s most recent weight documented in the medical record in pounds (lbs.) or
kilograms (kg) prior to or otherwise closest to the procedure.
Wound class: An assessment of the degree of contamination of a surgical wound at the time of
the operation. Wound class should be assigned by a person involved in the surgical procedure
(e.g., surgeon, circulating nurse, etc.). The wound class system used in NHSN is an adaptation
of the American College of Surgeons wound classification schema.
There are a group of NHSN procedures that can never be coded as clean. NHSN reached the
decision regarding which NHSN operative procedures can never be classified as clean based
on feedback from external experts in the field of surgery.

January 2016

9-5

Procedure-associated Module
SSI

The procedures that can never be entered as clean are: APPY, BILI, CHOL, COLO, REC, SB
and VHYS. Therefore, for these procedures in the application clean is not an option on the
drop down menu.
For all other procedures clean is available as a choice and if the surgical team deems the
procedure to be clean it can be entered as such into the NHSN application. For example CSEC,
HYST, or OVRY can be a clean wound class if documented as such.
Wounds are divided into four classes:
1. Clean: An uninfected operative wound in which no inflammation is encountered and
the respiratory, alimentary, genital, or uninfected urinary tracts are not entered. In
addition, clean wounds are primarily closed and, if necessary, drained with closed
drainage. Operative incisional wounds that follow nonpenetrating (blunt) trauma
should be included in this category if they meet the criteria.
Note: The clean wound classification level will not be available for denominator data
entry for the following NHSN operative procedure categories: APPY, BILI, CHOL,
COLO, REC, SB, and VHYS
2. Clean-Contaminated: Operative wounds in which the respiratory, alimentary, genital,
or urinary tracts are entered under controlled conditions and without unusual
contamination. Specifically, operations involving the biliary tract, appendix, vagina,
and oropharynx are included in this category, provided no evidence of infection or
major break in technique is encountered.
3. Contaminated: Open, fresh, accidental wounds. In addition, operations with major
breaks in sterile technique (e.g., open cardiac massage) or gross spillage from the
gastrointestinal tract, and incisions in which acute, nonpurulent inflammation is
encountered including necrotic tissue without evidence of purulent drainage (e.g., dry
gangrene) are included in this category.
4. Dirty or Infected: Includes old traumatic wounds with retained devitalized tissue and
those that involve existing clinical infection or perforated viscera. This definition
suggests that the organisms causing postoperative infection were present in the
operative field before the operation.

January 2016

9-6

Procedure-associated Module
SSI

Table 1. Surgical Site Infection Criteria
Criterion

Surgical Site Infection (SSI)
Superficial incisional SSI
Must meet the following criteria:
Infection occurs within 30 days after any NHSN operative procedure
(where day 1 = the procedure date)
AND
involves only skin and subcutaneous tissue of the incision
AND
patient has at least one of the following:
a. purulent drainage from the superficial incision.
b. organisms identified from an aseptically-obtained specimen
from the superficial incision or subcutaneous tissue by a culture or
non-culture based microbiologic testing method which is
performed for purposes of clinical diagnosis or treatment (e.g., not
Active Surveillance Culture/Testing (ASC/AST).
c. superficial incision that is deliberately opened by a surgeon,
attending physician** or other designee and culture or non-culture
based testing is not performed.
AND
patient has at least one of the following signs or symptoms: pain or
tenderness; localized swelling; erythema; or heat. A culture or
non-culture based test that has a negative finding does not meet
this criterion.
d. diagnosis of a superficial incisional SSI by the surgeon or
attending physician** or other designee.
http://www.cdc.gov/nhsn/xls/icd10-pcs-pcm-nhsn-opc.xlsx
http://www.cdc.gov/nhsn/xls/cpt-pcm-nhsn.xlsx

** The term attending physician for the purposes of application of the
NHSN SSI criteria may be interpreted to mean the surgeon(s), infectious
disease, other physician on the case, emergency physician or physician’s
designee (nurse practitioner or physician’s assistant).

January 2016

9-7

Procedure-associated Module
SSI

Criterion
Comments

Reporting
Instructions
for
Superficial
SSI

January 2016

Surgical Site Infection (SSI)
There are two specific types of superficial incisional SSIs:
1. Superficial Incisional Primary (SIP) – a superficial incisional SSI
that is identified in the primary incision in a patient that has had an
operation with one or more incisions (e.g., C-section incision or
chest incision for CBGB)
2. Superficial Incisional Secondary (SIS) – a superficial incisional
SSI that is identified in the secondary incision in a patient that has
had an operation with more than one incision (e.g., donor site
incision for CBGB)
The following do not qualify as criteria for meeting the NHSN
definition of superficial SSI:
 Diagnosis/treatment of cellulitis (redness/warmth/swelling), by itself,
does not meet criterion d for superficial incisional SSI. An incision
that is draining or that has organisms identified by culture or nonculture based testing is not considered a cellulitis.
 A stitch abscess alone (minimal inflammation and discharge confined
to the points of suture penetration)
 A localized stab wound or pin site infection. While it would be
considered either a skin (SKIN) or soft tissue (ST) infection,
depending on its depth, it is not reportable under this module.
Note: A laparoscopic trocar site for an NHSN operative procedure is
not considered a stab wound.
 Circumcision is not an NHSN operative procedure. An infected
circumcision site in newborns is classified as CIRC and is not
reportable under this module.
 An infected burn wound is classified as BURN and is not reportable
under this module.

9-8

Procedure-associated Module
SSI

Criterion

Surgical Site Infection (SSI)
Deep incisional SSI
Must meet the following criteria:
Infection occurs within 30 or 90 days after the NHSN operative procedure
(where day 1 = the procedure date) according to the list in Table 2
AND
involves deep soft tissues of the incision (e.g., fascial and muscle layers)
AND
patient has at least one of the following:
a. purulent drainage from the deep incision.
b. a deep incision that spontaneously dehisces, or is deliberately
opened or aspirated by a surgeon, attending physician** or other
designee and organism is identified by a culture or non-culture
based microbiologic testing method which is performed for
purposes of clinical diagnosis or treatment (e.g., not Active
Surveillance Culture/Testing (ASC/AST) or culture or non-culture
based microbiologic testing method is not performed
AND
patient has at least one of the following signs or symptoms: fever
(>38°C); localized pain or tenderness. A culture or non-culture
based test that has a negative finding does not meet this criterion.
c. an abscess or other evidence of infection involving the deep
incision that is detected on gross anatomical or histopathologic
exam, or imaging test
** The term attending physician for the purposes of application of the
NHSN SSI criteria may be interpreted to mean the surgeon(s), infectious
disease, other physician on the case, emergency physician or physician’s
designee (nurse practitioner or physician’s assistant).

Comments

There are two specific types of deep incisional SSIs:
1. Deep Incisional Primary (DIP) – a deep incisional SSI that is
identified in a primary incision in a patient that has had an
operation with one or more incisions (e.g., C-section incision or
chest incision for CBGB)
2. Deep Incisional Secondary (DIS) – a deep incisional SSI that is
identified in the secondary incision in a patient that has had an
operation with more than one incision (e.g., donor site incision for
CBGB)
Organ/Space SSI
Must meet the following criteria:
Infection occurs within 30 or 90 days after the NHSN operative procedure
(where day 1 = the procedure date) according to the list in Table 2

January 2016

9-9

Procedure-associated Module
SSI

Criterion

January 2016

Surgical Site Infection (SSI)
AND
infection involves any part of the body deeper than the fascial/muscle
layers, that is opened or manipulated during the operative procedure
AND
patient has at least one of the following:
a. purulent drainage from a drain that is placed into the organ/space
(e.g., closed suction drainage system, open drain, T-tube drain, CT
guided drainage)
b. organisms are identified from an aseptically-obtained fluid or
tissue in the organ/space by a culture or non-culture based
microbiologic testing method which is performed for purposes of
clinical diagnosis or treatment (e.g., not Active Surveillance
Culture/Testing (ASC/AST).
c. an abscess or other evidence of infection involving the
organ/space that is detected on gross anatomical or histopathologic
exam, or imaging test
AND
meets at least one criterion for a specific organ/space infection site listed
in Table 3. These criteria are found in the Surveillance Definitions for
Specific Types of Infections chapter.

9-10

Procedure-associated Module
SSI

Table 2. Surveillance Period for Deep Incisional or Organ/Space SSI Following Selected
NHSN Operative Procedure Categories. Day 1 = the date of the procedure.

30-day Surveillance
Code
AAA
AMP
APPY
AVSD
BILI
CEA
CHOL
COLO
CSEC
GAST
HTP

Operative Procedure
Abdominal aortic aneurysm repair
Limb amputation
Appendix surgery
Shunt for dialysis
Bile duct, liver or pancreatic surgery
Carotid endarterectomy
Gallbladder surgery
Colon surgery
Cesarean section
Gastric surgery
Heart transplant

Code
LAM
LTP
NECK
NEPH
OVRY
PRST
REC
SB
SPLE
THOR
THYR

HYST
KTP

Abdominal hysterectomy
Kidney transplant

VHYS
XLAP

Operative Procedure
Laminectomy
Liver transplant
Neck surgery
Kidney surgery
Ovarian surgery
Prostate surgery
Rectal surgery
Small bowel surgery
Spleen surgery
Thoracic surgery
Thyroid and/or parathyroid
surgery
Vaginal hysterectomy
Exploratory Laparotomy

90-day Surveillance
Code
BRST
CARD
CBGB
CBGC
CRAN
FUSN
FX
HER
HPRO
KPRO
PACE
PVBY
VSHN

Operative Procedure
Breast surgery
Cardiac surgery
Coronary artery bypass graft with both chest and donor site incisions
Coronary artery bypass graft with chest incision only
Craniotomy
Spinal fusion
Open reduction of fracture
Herniorrhaphy
Hip prosthesis
Knee prosthesis
Pacemaker surgery
Peripheral vascular bypass surgery
Ventricular shunt

Note: Superficial incisional SSIs are only followed for a 30-day period for all procedure types.

January 2016

9-11

Procedure-associated Module
SSI

Table 3. Specific Sites of an Organ/Space SSI.
Code
BONE

Osteomyelitis

Site

BRST
CARD
DISC
EAR

Breast abscess or mastitis
Myocarditis or pericarditis
Disc space
Ear, mastoid

EMET
ENDO
EYE
GIT
HEP
IAB
IC
JNT

Endometritis
Endocarditis
Eye, other than conjunctivitis
GI tract
Hepatitis
Intraabdominal, not specified
Intracranial, brain abscess or dura
Joint or bursa

Code
Site
LUNG Other infections of the respiratory
tract
MED
Mediastinitis
MEN
Meningitis or ventriculitis
ORAL Oral cavity (mouth, tongue, or gums)
OREP Other infections of the male or female
reproductive tract
PJI
Periprosthetic Joint Infection
SA
Spinal abscess without meningitis
SINU Sinusitis
UR
Upper respiratory tract
USI
Urinary System Infection
VASC Arterial or venous infection
VCUF Vaginal cuff

(Criteria for these sites can be found in the Surveillance Definitions for Specific Types of
Infections chapter).
Note: Appendix 1 contains a list of all NHSN operative procedure groups and the site specific
SSIs that are available as events for each group.
Numerator Data: All patients having any of the procedures included in the selected NHSN
operative procedure category(s) are monitored for signs of SSI. The Surgical Site Infection
(SSI) form is completed for each such patient found to have an SSI. If no SSI events are
identified during the surveillance month, check the “Report No Events” field in the Missing
PA Events tab of the Incomplete/Missing List.
The Instructions for Completion of the Surgical Site Infection form include brief instructions
for collection and entry of each data element on the form. The SSI form includes patient
demographic information and information about the operative procedure, including the date
and type of procedure. Information about the SSI includes the date of SSI, specific criteria met
for identifying the SSI, when/how the SSI was detected, whether the patient developed a
secondary bloodstream infection, whether the patient died, the organisms identified and the
organisms’ antimicrobial susceptibilities.

January 2016

9-12

Procedure-associated Module
SSI

SSI Event Reporting Instructions:
1. Excluded organisms: Organisms belonging to the following genera cannot be used to
meet any NHSN definition: Blastomyces, Histoplasma, Coccidioides, Paracoccidioides,
Cryptococcus and Pneumocystis. These organisms are typically causes of communityassociated infections and are rarely known to cause healthcare-associated infections, and
therefore are excluded.
2. Attributing SSI to an NHSN procedure when there is evidence of infection at the time
of the primary surgery: POA definition does not apply to the SSI protocol. If there was
evidence of infection at the time of the procedure and then later in the surveillance period
the patient develops an infection that meets the NHSN SSI criteria it is attributed to the
procedure (see PATOS below). A high wound class is not an exclusion for a patient later
meeting criteria for an SSI.
3. Infection present at time of surgery (PATOS): PATOS denotes that there is evidence of
an infection or abscess at the start of or during the index surgical procedure (in other
words, it is present preoperatively). PATOS is a YES/NO field on the SSI Event form.
PATOS does not apply if there is a period of wellness between the time of a preoperative
condition and surgery. The evidence of infection or abscess must be noted/documented
intraoperatively in an intraoperative note (immediate postoperative note). Only select
PATOS = YES if it applies to the depth of SSI that is being attributed to the procedures
(e.g., if a patient has evidence of an intraabdominal infection at the time of surgery and
then later returns with an organ/space SSI the PATOS field would be selected as a YES. If
the patient returned with a superficial or deep incisional SSI the PATOS field would be
selected as a NO). The patient does not have to meet the NHSN definition of an SSI at the
time of the primary procedure but there must be notation that there is evidence of an
infection or abscess present at the time of surgery. PATOS is not diagnosis driven (e.g.
diverticulitis, peritonitis, and appendicitis). Identification of an organism alone using
culture or non-culture based microbiologic testing method or on a pathology report from a
surgical specimen does not = PATOS. Additionally, the following verbiage alone without
specific mention of infection does not meet the PATOS definition: colon perforation,
necrosis, gangrene, fecal spillage, nicked bowel during procedure, or a note of
inflammation. Fresh traumas that are contaminated cases do not necessarily meet PATOS.
For example, a gunshot wound to the abdomen will be a trauma case with a high wound
class but there would not have been time for infection to develop. PATOS can be met
when an abscess is noted, there is mention of infection in the OR note, purulence or pus is
noted, septic/feculent peritonitis is noted. An infected appendix that has ruptured will meet
PATOS =Yes, if the patient has a subsequent intraabdominal organ space SSI.
a) Example: Patient admitted with an acute abdomen. Sent to OR for an XLAP where
there is a finding of an abscess due to ruptured appendix and an APPY is performed.
Patient returns two weeks later and meets criteria for an organ/space IAB SSI. The
PATOS field would be selected as YES on the SSI event.
January 2016

9-13

Procedure-associated Module
SSI

b) Example: Patient is admitted with a ruptured diverticulum. In the OR note the surgeon
documents that there are multiple abscesses in the intraabdominal cavity. Patient
returns three weeks later and meets criteria for a superficial SSI. The PATOS field
would be selected as NO since there was no documentation of evidence of infection or
abscess of the superficial area at the time of the procedure.
c) Example: During an unplanned cesarean section (CSEC) the surgeon nicks the bowel
and there is contamination of the intraabdominal cavity. One week later the patient
returns and meets criteria for an organ/space OREP (other reproductive) SSI. The
PATOS field would be selected as NO since there was no documentation of evidence
of infection or abscess at the time of the CSEC. The colon nick was a complication but
there was no infection present at the time of surgery.
4. Multiple tissue levels are involved in the infection: The type of SSI (superficial
incisional, deep incisional, or organ/space) reported should reflect the deepest tissue layer
involved in the infection during the surveillance period:
a) Report infection that involves the organ/space as an organ/space SSI, whether or
not it also involves the superficial or deep incision sites.
b) Report infection that involves the superficial and deep incisional sites as a deep
incisional SSI.
c) If an SSI started as a superficial SSI on day 10 of the SSI surveillance period and
then a week later, (day 17 of the SSI surveillance period) meets criteria for a deep
incisional SSI the date of event would be the date the of deep incisional SSI.
5. Reporting of SSI after a non-primary closure: If a patient develops an SSI after a nonprimary closure it should be reported as attributable to that procedure if it meets criteria for
an SSI within the appropriate surveillance period.
6. Attributing SSI to a NHSN procedure when several are performed on different dates:
If a patient has several NHSN operative procedures performed on different dates prior to
an infection, report the operative procedure code of the operation that was performed most
closely in time prior to the infection date, unless there is evidence that the infection was
associated with a different operation.
Note: For multiple NHSN operative procedures performed within a 24 hour period, see
Denominator Reporting Instruction #9.
7. Attributing SSI to NHSN procedures that involve multiple primary incision sites: If
multiple primary incision sites of the same NHSN operative procedure become infected,
only report as a single SSI, and assign the type of SSI (superficial incisional, deep
incisional, or organ/space) that represents the deepest tissue level involved at any of the
infected sites. For example:
a) If one laparoscopic incision meets criteria for a superficial incisional SSI and
another meets criteria for a deep incisional SSI, only report one deep incisional SSI.

January 2016

9-14

Procedure-associated Module
SSI

b) If one or more laparoscopic incision sites meet criteria for superficial incisional SSI
but the patient also has an organ/space SSI related to the laparoscopic procedure,
only report one organ/space SSI.
c) If an operative procedure is limited to a single breast and involves multiple
incisions in that breast that become infected, only report a single SSI.
d) In a colostomy formation or reversal (take down) procedure, the stoma and other
abdominal incision sites are considered primary incisions. If both the stoma and
another abdominal incision site develop superficial incisional SSI, report only as
one SSI (SIP).
8. Attributing SSI to NHSN procedures that have secondary incision sites: Certain
procedures can involve secondary incisions (i.e., BRST, CBGB, CEA, FUSN, PVBY,
REC, and VSHN). The surveillance period for all secondary sites is 30 days, regardless of
the required deep incisional or organ/space SSI surveillance period for the primary incision
site(s) (Table 2). Procedures meeting this designation are reported as only one operative
procedure. For example:
a) A saphenous vein harvest incision site in a CBGB procedure is considered the
secondary incision. One CBGB procedure is reported, the saphenous vein harvest
site is monitored for 30 days after surgery for SSI, and the chest incision is
monitored for 90 days. If the patient has a superficial infection of the leg site and a
deep incisional SSI of the chest site two SSIs are reported.
b) A tissue harvest site (e.g., Transverse Rectus Abdominis Myocutaneous [TRAM]
flap) in a BRST procedure is considered the secondary incision site. One BRST
procedure is reported, and if the secondary incision gets infected, report as either
SIS or DIS as appropriate.
9. SSI detected at another facility: It is required that if an SSI is detected at a facility other
than the one in which the operation was performed, notify the IP of the index facility with
enough detail so the infection can be reported to NHSN. When reporting the SSI, the index
facility should indicate that Detected = RO – (Readmission to facility other than where
procedure was performed).
10. SSI Attribution after Multiple types of NHSN procedures are performed during a
single trip to the OR: If more than one NHSN operative procedure category was
performed through a single incision/laparoscopic sites during a single trip to the operating
room, attribute the SSI to the procedure that is thought to be associated with the infection.
If it is not clear, as is often the case when the infection is an incisional SSI, use the NHSN
Principal Operative Procedure Category Selection Lists (Table 4) to select the operative
procedure to which the SSI should be attributed. For example, if a patient develops SSI
after a single trip to the OR in which both a COLO and SB were performed, and the source
of the SSI is not apparent, assign the SSI to the COLO procedure.
11. SSI following invasive manipulation/accession of the operative site: If during the postoperative period the surgical site has an invasive manipulation/accession for diagnostic or
January 2016

9-15

Procedure-associated Module
SSI

therapeutic purposes (e.g., needle aspiration), and following this manipulation/accession an
SSI develops, the infection is not attributed to the operation. This reporting instruction
does NOT apply to closed manipulation (e.g., closed reduction of a dislocated hip after an
orthopedic procedure). Invasive manipulation does not include wound packing, or
changing of wound packing materials as part of postoperative care.
12. Reporting instructions for specific post-operative infection scenarios: An SSI that
otherwise meets the NHSN definitions should be reported to NHSN without regard to postoperative accidents, falls, inappropriate showering or bathing practices, or other
occurrences that may or may not be attributable to patients’ intentional or unintentional
postoperative actions. Also, SSI should also be reported regardless of the presence of
certain skin conditions (e.g., dermatitis, blister, impetigo) that occur near an incision, and
regardless of the possible occurrence of a “seeding” event from an unrelated procedure
(e.g., dental work). This instruction concerning various postoperative circumstances is
necessary to reduce subjectivity and data collection burden associated with the previously
exempted scenarios.
Table 4. NHSN Principal Operative Procedure Category Selection Lists
(The categories with the highest risk of SSI are listed before those with lower risks).
Priority
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Priority
1
2
3
January 2016

Code
LTP
COLO
BILI
SB
REC
KTP
GAST
AAA
HYST
CSEC
XLAP
APPY
HER
NEPH
VHYS
SPLE
CHOL
OVRY
Code
HTP
CBGB
CBGC

Abdominal Operations
Liver transplant
Colon surgery
Bile duct, liver or pancreatic surgery
Small bowel surgery
Rectal surgery
Kidney transplant
Gastric surgery
Abdominal aortic aneurysm repair
Abdominal hysterectomy
Cesarean section
Laparotomy
Appendix surgery
Herniorrhaphy
Kidney surgery
Vaginal Hysterectomy
Spleen surgery
Gall bladder surgery
Ovarian surgery
Thoracic Operations
Heart transplant
Coronary artery bypass graft with donor incision(s)
Coronary artery bypass graft, chest incision only
9-16

Procedure-associated Module
SSI

4
5
Priority
1
2
3
4
Priority
1
2

CARD
THOR
Code
VSHN
CRAN
FUSN
LAM
Code
NECK
THYR

Cardiac surgery
Thoracic surgery
Neurosurgical (Brain/Spine) Operations
Ventricular shunt
Craniotomy
Spinal fusion
Laminectomy
Neck Operations
Neck surgery
Thyroid and or parathyroid surgery

Denominator Data: For all patients having any of the procedures included in the NHSN
Operative Procedure category(s) selected for surveillance during the month, complete the
Denominator for Procedure form. The data are collected individually for each operative
procedure performed during the month specified on the Patient Safety Monthly Reporting
Plan. The Instructions for Completion of the Denominator for Procedure Form include brief
instructions for collection and entry of each data element on the form.
Denominator Reporting Instructions:
1. Closure type: Incisional closure is NOT a part of the NHSN operative procedure
definition; all otherwise eligible procedures are included in the denominator reporting,
regardless of closure type. The closure technique is entered for each denominator for
procedure. If a procedure has multiple incision sites and any of the incisions are closed
primarily then the procedure is entered as a primary closure.
Note: When the patient returns to the OR within 24 hours of the end of the first procedure
assign the surgical wound closure that applies when the patient leaves the OR from the first
operative procedure.
2. Wound class: A high wound class is not an exclusion for denominator reporting. If the
procedure meets the definition of an NHSN operative procedure it should be reported in
the denominator data regardless of wound class. NHSN will use the wound class for risk
adjustment, as appropriate.
3. Different operative procedure categories performed during same trip to the OR: If
procedures in more than one NHSN operative procedure category are performed during the
same trip to the operating room through the same or different incisions, a Denominator for
Procedure form is reported for each NHSN operative procedure category being monitored.
For example, if a CARD and CBGC are done through the same incision, a Denominator
for Procedure form is reported for each. In another example, if following a motor vehicle
accident, a patient has an open reduction of fracture (FX) and splenectomy (SPLE)
performed during the same trip to the operating room and both procedure categories are
being monitored, complete a Denominator for Procedure form for each.
January 2016

9-17

Procedure-associated Module
SSI

EXCEPTION: If a patient has both a CBGC and CBGB during the same trip to the
operating room, report only as a CBGB. Only report as a CBGC if there is only a chest
incision. CBGB and CBGC are never reported for the same patient for the same trip to the
operating room.
4. Duration of the procedure when more than one category of NHSN operative
procedure is performed through the same incision: If more than one NHSN operative
procedure category is performed through the same incision during the same trip to the
operating room, record the combined duration of all procedures, which is the time from
procedure/surgery start time to procedure/surgery finish time. For example, if a CBGC and
a CARD are performed on a patient during the same trip to the operating room, the time
from start time to finish time is reported for both operative procedures.
5. Duration of Operative procedures if patient has two different NHSN operative
procedures performed via separate incisions on the same trip to the OR; try to
determine the correct duration for each separate procedure (if this is documented),
otherwise, take the time for both procedures and split it evenly between the two.
6. Same operative procedure category but different ICD-10-PCS or CPT codes during
same trip to the OR: If procedures of different ICD-10-PCS or CPT codes from the same
NHSN operative procedure category are performed through the same incision/laparoscopic
sites, record only one procedure for that category. For example, a facility is performing
surveillance for CARD procedures. A patient undergoes a replacement of both the mitral
and tricuspid valves during the same trip to the operating room. Complete one CARD
Denominator for Procedure form because both procedures are in the same operative
procedure category [CARD].
7. For revision HPRO and KPRO procedures: If total or partial revision HPRO or KPRO
is performed, evaluate if any of the ICD-10-PCS/CM diagnosis or procedure codes (see
link below) were coded for that joint in the 90 days prior to and including the index HPRO
or KPRO revision. If any of the specified codes is recorded, indicate on the denominator
form that the revision was associated with ‘prior infection at index joint’ = YES. Note that
the ‘prior infection at index joint’ variable only applies to revision HPRO and KPRO. The
cases designated ‘prior infection at index joint’ = yes should be validated before the
procedure is submitted to NHSN. This validation is necessary to ensure the code is aligned
with the index joint revision. The ICD-10-PCS/CM code mapping guidance is found on the
NHSN website in the SSI section under “Supporting Materials.”
8. Same NHSN operative procedure via separate incisions: For operative procedures that
can be performed via separate incisions during same trip to operating room (i.e., AMP,
BRST, CEA, FUSN, FX, HER, HPRO, KPRO, LAM, NEPH, OVRY, PVBY, REFUSN),
separate Denominator for Procedure forms are completed. To document the duration of
the procedures, indicate the procedure/surgery start time to procedure/surgery finish time

January 2016

9-18

Procedure-associated Module
SSI

for each procedure separately or, alternatively, take the total time for the procedures and
split it evenly between procedures.
Notes:
1. A COLO procedure with a colostomy formation is entered as one COLO procedure.
2. Laparoscopic hernia repairs are considered one procedure, regardless of the number of
hernias that are repaired in that trip to the OR. In most cases there will be only one
incision time documented for this procedure. If more than one time is documented,
total the durations. Open (i.e., non-laparoscopic) hernia repairs are reported as one
procedure for each hernia repaired via a separate incision, (i.e., if two incisions are
made to repair two defects), then two procedures will be reported. It is anticipated that
separate incision times will be recorded for these procedures. If not, take the total time
for both procedures and split it evenly between the two.
9. More than one operative procedure through same incision within 24 hours: If a
patient goes to the operating room more than once during the same admission and another
procedure of the same or different NHSN procedure category is performed through the
same incision and the start time of the second procedure is within 24 hours of the finish
time of the original operative incision, report only one Denominator for Procedure form
for the original procedure, combining the durations for both procedures based on the
procedure start times and finish times for both procedures. For example, a patient has a
CBGB lasting 4 hours. He returns to the OR six hours later for another NHSN operative
procedure via the same incision (e.g., CARD). The second operation has duration of 1.5
hours. Record the operative procedure as one CBGB and the duration of operation as 5
hour 30 minutes. If the wound class has changed, report the higher wound class. If the
ASA class has changed, report the higher ASA class. Do not report the CARD procedure
in your denominator data.
Note: When the patient returns to the OR within 24 hours of the end of the first procedure
assign the surgical wound closure technique that applies when the patient leaves the OR
from the first operative procedure.
10. Patient expires in the OR: If a patient expires in the operating room, do not complete a
Denominator for Procedure form. This operative procedure is excluded from the
denominator.
11. Laparoscopic hysterectomy – HYST or VHYS: When assigning the correct ICD-10PCS or CPT hysterectomy procedure codes, a trained coder must determine what structures
were detached and how they were detached based on the medical record documentation.
The code assignment is based on the surgical technique or approach used for the
detachment of those structures, not on the location of where the structures were physically
removed from the patient’s body.

January 2016

9-19

Procedure-associated Module
SSI

Data Analyses: The Standardized Infection Ratio (SIR) is calculated by dividing the number
of observed infections by the number of predicted (i.e., expected) infections. The number of
predicted infections is calculated using SSI probabilities estimated from multivariate logistic
regression models constructed from NHSN data during a baseline time period, which
represents a standard population’s SSI experience4.
There are three SSI SIR models available from NHSN, each briefly described in the table
below.
All SSI SIR
Model





Complex
A/R SSI
Model




Complex
30-day SSI
model (used
for CMS
IPPS)








Includes Superficial, Deep & Organ/Space SSIs
Superficial & Deep incisional SSIs limited to primary incisional SSIs only
Includes SSIs identified on admission, readmission & via post-discharge
surveillance
Includes only Deep incisional primary SSIs & Organ/Space SSIs
Includes only SSIs identified on Admission/Readmission to facility where
procedure was performed
Includes only inpatient procedures
Used for the HAI Progress Report, published annually by CDC
Includes only in-plan, inpatient COLO and HYST procedures in adult
patients (i.e., ≥ 18 years of age)
Includes only deep incisional primary SSIs and organ/space SSIs with an
event date within 30 days of the procedure
Uses only age and ASA to determine risk
Used only for CMS IPPS reporting and for public reporting on Hospital
Compare

While the SSI SIR can be calculated for single procedure categories and for specific surgeons,
the measure also allows you to summarize your data across multiple procedure categories
while adjusting for differences in the estimated probability of infection among the patients
included across the procedure categories. For example, you will be able to obtain one SSI SIR
adjusting for all procedures reported. Alternatively, you can obtain one SSI SIR for all colon
surgeries (COLO) only within your facility.
Additional Notes about SSI SIRS:
1. Primary closure: All of the SSI SIRs that use the 2006-2008 SSI baseline data will
include only those procedures that were reported with a primary closure method.3
2. Infection present at time of surgery (PATOS): All of the SSI SIRs that use the 20062008 SSI baseline will include SSIs that are reported as present at time of surgery.
3. SIRs based on Procedure Date: SSIs will be included in the numerator of an SIR
based on the date of procedure, not the date of event.
4. Calculation of the SIR: The SIR will be calculated only if the number of predicted
HAIs (“numExp” in the NHSN application) is ≥ 1 to help enforce a minimum precision
criterion.
January 2016

9-20

Procedure-associated Module
SSI

SIR = Observed (O) HAIs
Expected (E) HAIs
SSI rates per 100 operative procedures are calculated by dividing the number of SSIs by the
number of specific operative procedures and multiplying the results by 100. SSIs will be
included in the numerator of a rate based on the date of procedure, not the date of event. Using
the advanced analysis feature of the NHSN application, SSI rate calculations can be performed
separately for the different types of operative procedures and stratified by the basic risk index.
Descriptive analysis options of numerator and denominator data are available in the NHSN
application, such as line listings, frequency tables, and bar and pie charts. SIRs and SSI rates
and run charts are also available. Guides on using NHSN analysis features are available from:
http://www.cdc.gov/nhsn/PS-Analysis-resources/reference-guides.html

January 2016

9-21

Procedure-associated Module
SSI

APPENDIX 1: SSI specific event types attributed to each NHSN procedure category.
Procedure code
AAA - abdominal aortic aneurysm repair

AMP - Limb amputation

APPY - Appendix surgery

Specific Event Code
DIP - Deep Incisional Primary
CARD - Myocarditis or pericarditis
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
SIP - Superficial Incisional Primary
VASC - Arterial or venous infection
BONE - Osteomyelitis
DIP - Deep Incisional Primary
JNT - Joint or bursa
SIP - Superficial Incisional Primary
DIP - Deep Incisional Primary
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
SIP - Superficial Incisional Primary

AVSD - AV shunt for dialysis

DIP - Deep Incisional Primary
SIP - Superficial Incisional Primary
VASC - Arterial or venous infection

BILI - Bile duct, liver or pancreatic
surgery

DIP - Deep Incisional Primary
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
SIP - Superficial Incisional Primary

BRST - Breast surgery

BRST - Breast abscess or mastitis
DIP - Deep Incisional Primary
DIS - Deep Incisional Secondary
SIP - Superficial Incisional Primary
SIS - Superficial Incisional Secondary

CARD - Cardiac surgery

BONE - Osteomyelitis
CARD - Myocarditis or pericarditis
DIP - Deep Incisional Primary
ENDO - Endocarditis
IAB - Intraabdominal, not specified elsewhere
LUNG - Other infections of the lower respiratory tract
MED - Mediastinitis
SIP - Superficial Incisional Primary
VASC - Arterial or venous infection

January 2016

9-22

Procedure-associated Module
SSI

Procedure code
CBGB - Coronary bypass with chest &
donor incisions

CBGC - Coronary bypass graft with chest
incision

CEA - Carotid endarterectomy

CHOL - Gallbladder surgery

COLO - Colon surgery

CRAN - Craniotomy

January 2016

Specific Event Code
BONE - Osteomyelitis
CARD - Myocarditis or pericarditis
DIP - Deep Incisional Primary
DIS - Deep Incisional Secondary
ENDO - Endocarditis
IAB - Intraabdominal, not specified elsewhere
LUNG - Other infections of the lower respiratory tract
MED - Mediastinitis
SIP - Superficial Incisional Primary
SIS - Superficial Incisional Secondary
VASC - Arterial or venous infection
BONE - Osteomyelitis
CARD - Myocarditis or pericarditis
DIP - Deep Incisional Primary
ENDO - Endocarditis
IAB - Intraabdominal, not specified elsewhere
LUNG - Other infections of the lower respiratory tract
MED - Mediastinitis
SIP - Superficial Incisional Primary
VASC - Arterial or venous infection
DIP - Deep Incisional Primary
DIS - Deep Incisional Secondary
SIS - Superficial Incisional Secondary
SIP - Superficial Incisional Primary
VASC - Arterial or venous infection
DIP - Deep Incisional Primary
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
SIP - Superficial Incisional Primary
DIP - Deep Incisional Primary
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
SIP - Superficial Incisional Primary
OREP - Other infection of the male or female
reproductive tract
USI - Urinary System Infection
BONE - Osteomyelitis
DIP - Deep Incisional Primary
IC - Intracranial infection
MEN - Meningitis or ventriculitis
SINU - Sinusitis
SIP - Superficial Incisional Primary

9-23

Procedure-associated Module
SSI

Procedure code
CSEC - Cesarean section

FUSN - Spinal fusion

FX - Open reduction of fracture

GAST - Gastric surgery

HER - Herniorrhaphy

HPRO - Hip prosthesis

January 2016

Specific Event Code
DIP - Deep Incisional Primary
EMET - Endometritis
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
USI - Urinary System Infection
BONE - Osteomyelitis
DIP - Deep Incisional Primary
DIS - Deep Incisional Secondary
DISC - Disc space infection
IAB - Intraabdominal, not specified elsewhere
IC - Intracranial infection
LUNG - Other infections of the lower respiratory tract
MEN - Meningitis or ventriculitis
SA - Spinal abscess without meningitis
SIP - Superficial Incisional Primary
SIS - Superficial Incisional Secondary
BONE - Osteomyelitis
DIP - Deep Incisional Primary
JNT - Joint or bursa
SIP - Superficial Incisional Primary
DIP - Deep Incisional Primary
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
LUNG - Other infections of the lower respiratory tract
SIP - Superficial Incisional Primary
DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
SIP - Superficial Incisional Primary
BONE - Osteomyelitis
DIP - Deep Incisional Primary
PJI - Prosthetic joint infection
SIP - Superficial Incisional Primary

9-24

Procedure-associated Module
SSI

Procedure code
HTP - Heart transplant

HYST - Abdominal hysterectomy

KPRO - Knee prosthesis

KTP - Kidney transplant

LAM - Laminectomy

LTP - Liver transplant

January 2016

Specific Event Code
BONE - Osteomyelitis
CARD - Myocarditis or pericarditis
DIP - Deep Incisional Primary
ENDO - Endocarditis
IAB - Intraabdominal, not specified elsewhere
LUNG - Other infections of the lower respiratory tract
MED - Mediastinitis
SIP - Superficial Incisional Primary
VASC - Arterial or venous infection
DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
VCUF - Vaginal cuff infection
BONE - Osteomyelitis
DIP - Deep Incisional Primary
SIP - Superficial Incisional Primary
PJI - Prosthetic joint infection
DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
USI - Urinary System Infection
VASC - Arterial or venous infection
BONE - Osteomyelitis
DIP - Deep Incisional Primary
DISC - Disc space infection
IAB - Intraabdominal, not specified elsewhere
IC - Intracranial infection
MEN - Meningitis or ventriculitis
SA - Spinal abscess without meningitis
SIP - Superficial Incisional Primary
DIP - Deep Incisional Primary
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
HEP - Hepatitis
SIP - Superficial Incisional Primary
VASC - Arterial or venous infection

9-25

Procedure-associated Module
SSI

Procedure code
NECK - Neck surgery

NEPH - Kidney surgery

OVRY - Ovarian surgery

PACE - Pacemaker surgery

PRST - Prostate surgery

PVBY - Peripheral vascular bypass
surgery

REC - Rectal surgery

January 2016

Specific Event Code
DIP - Deep Incisional Primary
EAR - Ear, mastoid infection
ORAL - Oral cavity infection (mouth, tongue, or gums)
SIP - Superficial Incisional Primary
UR - Upper respiratory tract infection, pharyngitis,
laryngitis, epiglottitis
DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
USI - Urinary System Infection
DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
USI - Urinary System Infection
CARD - Myocarditis or pericarditis
DIP - Deep Incisional Primary
ENDO - Endocarditis
IAB - Intraabdominal, not specified elsewhere
SIP - Superficial Incisional Primary
VASC - Arterial or venous infection
DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
USI - Urinary System Infection
DIP - Deep Incisional Primary
DIS - Deep Incisional Secondary
SIP - Superficial Incisional Primary
SIS - Superficial Incisional Secondary
VASC - Arterial or venous infection
DIP - Deep Incisional Primary
DIS - Deep Incisional Secondary
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
SIS - Superficial Incisional Secondary
USI - Urinary System Infection

9-26

Procedure-associated Module
SSI

Procedure code
SB - Small bowel surgery

Specific Event Code
DIP - Deep Incisional Primary
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
USI - Urinary System Infection

SPLE - Spleen surgery

DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
SIP - Superficial Incisional Primary

THOR - Thoracic surgery

BONE - Osteomyelitis
BRST - Breast abscess or mastitis
DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
LUNG - Other infections of the lower respiratory tract
SIP - Superficial Incisional Primary
DIP - Deep Incisional Primary
EAR - Ear, mastoid infection
GIT - Gastrointestinal tract
SIP - Superficial Incisional Primary
UR - Upper respiratory tract infection, pharyngitis,
laryngitis, epiglottitis
DIP - Deep Incisional Primary
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
USI - Urinary System Infection
VCUF - Vaginal cuff infection
BONE - Osteomyelitis
DIP - Deep Incisional Primary
DIS - Deep Incisional Secondary
IAB - Intraabdominal, not specified elsewhere
IC - Intracranial infection
LUNG - Other infections of the lower respiratory tract
MEN - Meningitis or ventriculitis
SA - Spinal abscess without meningitis
SIP - Superficial Incisional Primary
SIS - Superficial Incisional Secondary

THYR - Thyroid and/or parathyroid
surgery

VHYS - Vaginal hysterectomy

VSHN - Ventricular shunt

January 2016

9-27

Procedure-associated Module
SSI

Procedure code
XLAP - Exploratory laparotomy

January 2016

Specific Event Code
DIP - Deep Incisional Primary
EMET - Endometritis
GIT - Gastrointestinal tract
IAB - Intraabdominal, not specified elsewhere
OREP - Other infection of the male or female
reproductive tract
SIP - Superficial Incisional Primary
USI - Urinary System Infection

9-28

Procedure-associated Module
SSI

References
1.

2.

3.
4.

5.

6.
7.
8.

9.

10.

11.
12.
13.

14.

15.

CDC. Data from the National Hospital Discharge Survey. 2010 [cited 2013 Dec
10]; Available from:
http://www.cdc.gov/nchs/data/nhds/4procedures/2010pro_numberpercentage.pdf.
Magill, S.S., et al., "Prevalence of healthcare-associated infections in acute care
hospitals in Jacksonville, Florida". Infection Control Hospital Epidemiology, 33(3):
(2012): 283-91.
Magill, S.S., et al., "Multistate point-prevalence survey of health care-associated
infections". New England Journal of Medicine, 370(13): (2014): 1198-1208.
Mu, Y., et al., "Improving risk-adjusted measures of surgical site infection for the
national healthcare safety network". Infection Control Hospital Epidemiology, 32(10):
(2011): 970-86.
CDC National and State Healthcare-Associated Infections Progress Report, published
March 2014, available at http://www.cdc.gov/HAI/pdfs/progress-report/hai- progressreport.pdf.
Awad, S.S., "Adherence to surgical care improvement project measures and postoperative surgical site infections". Surgical Infection (Larchmt), 13(4): (2012): 234-7.
Condon, R.E., et al., "Effectiveness of a surgical wound surveillance program".
Archives of Surgery, 118(3): (1983): 303-7.
Consensus paper on the surveillance of surgical wound infections. The Society for
Hospital Epidemiology of America; The Association for Practitioners in Infection
Control; The Centers for Disease Control; The Surgical Infection Society. Infection
Control Hospital Epidemiology, 13(10): (1992): 599-605.
Haley, R.W., et al., "The efficacy of infection surveillance and control programs
in preventing nosocomial infections in US hospitals". American Journal of
Epidemiology, 121(2) :(1985):182-205.
Mangram, A.J., et al., "Guideline for prevention of surgical site infection, 1999".
Hospital Infection Control Practices Advisory Committee. Infection Control Hospital
Epidemiology, 20(4): (1999): 250-78; quiz 279-80.
Institute, F.G., Guidelines for design and construction of health care facilities. 2010, Chicago,
IL: American Society for Healthcare Engineering.
Anonymous, "New classification of physical status". Anesthesiology, 24: (1963):
111.
ASA. ASA Physical Status Classification System. [cited 2013 Dec 10]; Available
from: http://www.asahq.org/Home/For-Members/Clinical-Information/ASA-PhysicalStatus-Classification-System.
Donham, R.T., W.J. Mazzei, and R.L. Jones, Association of Anesthesia Clinical
Directors' Procedure Times Glossary. American Journal of Anesthesiology, 23(5S):
(1996):S1-S12.
Centers for Disease Control and Prevention. The National Healthcare Safety
Network (NHSN) Manual: Patient Safety Component. Atlanta, GA: Division of
Healthcare Quality Promotion, National Center for Emerging and Zoonotic Infectious
Diseases. Available at: http://www.cdc.gov/nhsn/acute-care-hospital/index.html.

January 2016

9-29


File Typeapplication/pdf
File Title9 Surgical Site Infection (SSI) Event
SubjectInformation about surgical site infections andn NHSN system
AuthorCDC/OID/NCEZID/DHQP
File Modified2016-03-28
File Created2016-03-28

© 2024 OMB.report | Privacy Policy