2026 ICD-10-CM Diagnosis Code A05.4Foodborne Bacillus cereus intoxication

ICD-10-CM Codes›A00–B99›A00-A09›A05

ICD-10-CM A05.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A05.4 is a billable ICD-10-CM diagnosis code for foodborne Bacillus cereus intoxication. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 371 through 373. Coders also document this condition as food poisoning caused by Bacillus cereus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Foodborne intoxications.

Code Identity

ICD-10-CM Code
A05.4
Billable Status
Yes — Valid for Submission
Code Describes
Foodborne Bacillus cereus intoxication
Short Description
Foodborne Bacillus cereus intoxication
Same as the full description in the CMS dataset.
Parent Code
A05
Other bacterial foodborne intoxications, not elsewhere classified

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA05Other bacterial foodborne intoxications, not elsewhere classified
This CodeA05.4Foodborne Bacillus cereus intoxication

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Food poisoning caused by Bacillus cereus

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Intoxication
      • foodborne
        • due to
          • Bacillus cereus

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF005
Foodborne intoxications
Default principal diagnosis: inpatient Yes · outpatient Yes

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 A05.4 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
005.89 Bact food poisoning NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A05.4Overview

Is A05.4 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report foodborne Bacillus cereus intoxication on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A05.4 group to?

When foodborne Bacillus cereus intoxication is the principal diagnosis on an inpatient stay, it groups to MS-DRG 371, 372, 373, with relative weights from 0.7274 to 1.7731 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A05.4?

Under the General Equivalence Mappings, foodborne Bacillus cereus intoxication converts to ICD-9-CM 005.89 (bact food poisoning NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.