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ICD-10-CM 2027 diagnosis code

A05.2Foodborne Clostridium perfringens [Clostridium welchii] intoxication

✓ Billable / specificCC — complication/comorbidity

A05.2 is a valid, billable ICD-10-CM code for foodborne clostridium perfringens [clostridium welchii] intoxication. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Foodborne Clostridium perfringens intoxication

Looking up by condition? See ICD-10 code for Pig-bel.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A05.2

A05.2 is the ICD-10-CM diagnosis code for foodborne Clostridium perfringens [Clostridium welchii] intoxication. It belongs to category A05 (other bacterial foodborne intoxications, not elsewhere classified), block A00-A09 (intestinal infectious diseases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A05 (other bacterial foodborne intoxications, not elsewhere classified), A05.2 is specifically for foodborne Clostridium perfringens [Clostridium welchii] intoxication. Related codes cover foodborne staphylococcal intoxication (A05.0), botulism food poisoning (A05.1), foodborne Vibrio parahaemolyticus intoxication (A05.3), foodborne Bacillus cereus intoxication (A05.4), foodborne Vibrio vulnificus intoxication (A05.5), other specified bacterial foodborne intoxications (A05.8) and bacterial foodborne intoxication, unspecified (A05.9).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC, relative weight 1.7089), DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC, relative weight 0.9964) and DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC, relative weight 0.6941), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 005.2 (food poisoning due to Clostridium perfringens (C. welchii)).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Enteritis necroticans
  • Pig-bel

Notes that apply from higher levels

Instructions written at a parent level also apply to A05.2.

› From A05 Other bacterial foodborne intoxications, not elsewhere classified
Excludes1
  • 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)

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

9 entries

Terms in the official ICD-10-CM index that lead to A05.2.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 005.2Food poisoning due to Clostridium perfringens (C. welchii)exact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about A05.2

Is A05.2 billable?

Yes. A05.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A05.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A05.2 as a principal diagnosis.

Is A05.2 a CC or MCC?

A05.2 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does A05.2 group to?

A05.2 is used in the MS-DRG v44.0 logic for MS-DRG 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC), MS-DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC) and MS-DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for A05.2?

The CMS General Equivalence Mappings map A05.2 to ICD-9-CM 005.2.