A04.8 — Other specified bacterial intestinal infections

BillableUnspecifiedCC

Is A04.8 billable?

Yes, but A04.8 is an unspecified code. A04.8 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, A04.8 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting A04.8 — the more specific alternatives are listed below.

More specific alternatives

A04.8 at a glance

Code	A04.8
Description	Other specified bacterial intestinal infections
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does A04.8 group to?

A04.8 sits in MDC 06 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

371Major Gastrointestinal Disorders and Peritoneal Infections with MCCmedical
372Major Gastrointestinal Disorders and Peritoneal Infections with CCmedical
373Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCCmedical

As a secondary diagnosis, A04.8 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is A04.8 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to A04.8. They show the wording a clinician may have documented, which often differs from the Tabular description.

Colitis › staphylococcal (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)
Enteritis › staphylococcal (acute) (diarrheal) (hemorrhagic) (noninfective)
Infection, infected, infective › Helicobacter pylori (opportunistic)
Pseudotuberculosis › enterocolitis
Diarrhea, diarrheal › due to › Clostridium perfringens (disease) (infantile) (inflammatory)
Diarrhea, diarrheal › due to › Staphylococcus (disease) (infantile) (inflammatory)
Diarrhea, diarrheal › specified › bacterium NEC (disease) (infantile) (inflammatory)
Enteritis › bacterial › specified NEC (acute) (diarrheal) (hemorrhagic) (noninfective)
Diarrhea, diarrheal › due to › bacteria › specified NEC (disease) (infantile) (inflammatory)
Diarrhea, diarrheal › due to › specified organism NEC › bacterial (disease) (infantile) (inflammatory)
Enteritis › infectious NOS › due to › Aerobacter aerogenes (acute) (diarrheal) (hemorrhagic) (noninfective)
Enteritis › infectious NOS › due to › Clostridium perfringens (acute) (diarrheal) (hemorrhagic) (noninfective)

Excludes1 — never code together — inherited from A04

The conditions below can never be reported together with A04.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

bacterial foodborne intoxications, NEC (A05.-)
tuberculous enteritis (A18.32)

Use additional code — inherited from Chapter 1

Report an additional code alongside A04.8 to fully describe the condition. A04.8 is sequenced first.

code to identify resistance to antimicrobial drugs (Z16.-)

Excludes2 — not included here — inherited from Chapter 1

The conditions below are not part of A04.8, but a patient may have both at the same time. When documentation supports it, A04.8 and the excluded code may both be reported.

carrier or suspected carrier of infectious disease (Z22.-)
certain localized infections - see body system-related chapters
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
infectious and parasitic diseases specific to the perinatal period (P35-P39)
influenza and other acute respiratory infections (J00-J22)

How long has A04.8 existed?

A04.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.