2027 ICD-10-CM Diagnosis Code A05.2Foodborne Clostridium perfringens [Clostridium welchii] intoxication
ICD-10-CM Codes›A00–B99›A00-A09›A05
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A05.2 is a billable ICD-10-CM diagnosis code for foodborne Clostridium perfringens [Clostridium welchii] intoxication. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 371 through 373. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 84 closely related codes. Coders also document this condition as clostridial enteric disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Foodborne intoxications.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Clostridial enteric disease
- Enteritis necroticans
- Food poisoning caused by Clostridia
- Food poisoning caused by Clostridium perfringens
- Infection caused by Clostridium perfringens
- Infection caused by Clostridium perfringens type C
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A05.2: its own notes plus those printed at A05 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Enteritis necroticans
- Pig-bel
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name A05.2, its category, or a range that includes it.
Excludes1 4
These codes carry an Excludes1 note naming A05.2: they are not reported together with it, unless the two conditions are unrelated.
- A04 Other bacterial intestinal infectionsbacterial foodborne intoxications, NEC (A05.-) names A05.-, which includes this code
- T61 Toxic effect of noxious substances eaten as seafoodbacterial foodborne intoxications (A05.-) names A05.-, which includes this code
- T62 Toxic effect of other noxious substances eaten as foodbacterial food borne intoxications (A05.-) names A05.-, which includes this code
- T78.1 Other adverse food reactions, not elsewhere classifiedbacterial food borne intoxications (A05.-) names A05.-, which includes this code
Excludes2 2
These codes carry an Excludes2 note naming A05.2: its condition is not part of those codes, and both may be reported when the patient has both.
- Block P35-P39 Infections specific to the perinatal period
- P37 Other congenital infectious and parasitic diseases
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Infection, infected, infective (opportunistic) B99.9
due to food A05.2
foodborne (disease) A05.2
foodborne (disease) A05.2
necrotizing enteritis A05.2
perfringens A05.2
welchii A05.2
Pig-bel A05.2
Poisoning (acute) See Also: Table of Drugs and Chemicals;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Bacterial Infections
Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.
The full article covers:
- What are bacteria?
- How do bacterial infections spread?
- What are the treatments for bacterial infections?
- Can bacterial infections be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A05.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A05.2Overview
What is the ICD-10 code for foodborne Clostridium perfringens [Clostridium welchii] intoxication?
The ICD-10-CM code for foodborne Clostridium perfringens [Clostridium welchii] intoxication is A05.2 (sometimes written as A052). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A05.2 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report foodborne Clostridium perfringens [Clostridium welchii] intoxication on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A05.2 group to?
When foodborne Clostridium perfringens [Clostridium welchii] intoxication is the principal diagnosis on an inpatient stay, it groups to MS-DRG 372, 371, 373, with relative weights from 0.6945 to 1.7087 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A05.2 a CC or MCC?
CMS lists A05.2 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 84 closely related codes in its exclusion list.
Can A05.2 be reported with a code from A04.7?
Not as a rule. The Excludes1 note at A05, which applies to A05.2, lists "Clostridium difficile foodborne intoxication and infection (A04.7-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
