A05.2 — Foodborne Clostridium perfringens [Clostridium welchii] intoxication

BillableCC

Is A05.2 billable?

Yes — A05.2 is billable for FY2027. A05.2 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. A05.2 may be submitted for encounters from October 1, 2026 through September 30, 2027.

A05.2 at a glance

Code	A05.2
Description	Foodborne Clostridium perfringens [Clostridium welchii] intoxication
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does A05.2 group to?

A05.2 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, A05.2 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is A05.2 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to A05.2. They show the wording a clinician may have documented, which often differs from the Tabular description.

Pig-bel
Enteritis › necroticans (acute) (diarrheal) (hemorrhagic) (noninfective)
Infection, infected, infective › Clostridium NEC › perfringens › due to food (opportunistic)
Infection, infected, infective › Clostridium NEC › perfringens › foodborne (opportunistic)
Infection, infected, infective › Clostridium NEC › welchii › foodborne (opportunistic)
Infection, infected, infective › Clostridium NEC › welchii › necrotizing enteritis (opportunistic)
Poisoning › food NEC › due to › Clostridium (acute)
Intoxication › foodborne › due to › Clostridium › perfringens
Intoxication › foodborne › due to › Clostridium › welchii

Inclusion terms

Alternative wording in documentation that is classified to A05.2.

Enteritis necroticans
Pig-bel

Excludes1 — never code together — inherited from A05

The conditions below can never be reported together with A05.2 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

Clostridium difficile foodborne intoxication and infection (A04.7-)
Escherichia coli infection (A04.0-A04.4)
listeriosis (A32.-)
salmonella foodborne intoxication and infection (A02.-)
toxic effect of noxious foodstuffs (T61-T62)

Use additional code — inherited from Chapter 1

Report an additional code alongside A05.2 to fully describe the condition. A05.2 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 A05.2, but a patient may have both at the same time. When documentation supports it, A05.2 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 A05.2 existed?

A05.2 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.

Which conditions are coded to A05.2?

ICD-10 code for Enteritis