2026 ICD-10-CM Diagnosis Code A05.1Botulism food poisoning

ICD-10-CM Codes›A00–B99›A00-A09›A05

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

A05.1 is a billable ICD-10-CM diagnosis code for botulism food poisoning. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Foodborne intoxications.

Code Identity

ICD-10-CM Code
A05.1
Billable Status
Yes — Valid for Submission
Code Describes
Botulism food poisoning
Short Description
Botulism food poisoning
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 CodeA05.1Botulism food poisoning

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adult infection of intestine caused by Clostridium botulinum
  • Adult intestinal botulism
  • Autonomic disorder due to botulism
  • Disorder of autonomic nervous system due to infectious disease
  • Disorder of neuromuscular junction caused by botulinum toxin
  • Foodborne botulism
  • Foodborne botulism, type A
  • Foodborne botulism, type B
  • Foodborne botulism, type E
  • Foodborne botulism, type F
  • Infection caused by Clostridium botulinum
  • Infection of intestine caused by Clostridium botulinum
  • Intestinal botulism
  • Poisoning caused by Clostridium botulinum toxin
  • Toxic neuromuscular junction disorder

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Botulism NOS
  • Classical foodborne intoxication due to Clostridium botulinum

Type 1 Excludes

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.

    • Botulism(foodborne intoxication)
    • Enteritis(acute) (diarrheal) (hemorrhagic) (noninfective)
      • Clostridium
        • botulinum (food poisoning)
    • Infection, infected, infective(opportunistic)
      • Clostridium NEC
        • botulinum (food poisoning)
    • Intoxication
      • foodborne
        • classical (Clostridium botulinum)
    • Intoxication
      • foodborne
        • due to
          • Clostridium
            • botulinum
    • Poisoning(acute)
      • Bacillus B (aertrycke) (cholerae (suis)) (paratyphosus) (suipestifer)
        • botulinus
    • Poisoning(acute)
      • botulism
    • Poisoning(acute)
      • Clostridium botulinum
    • Poisoning(acute)
      • food NEC
        • due to
          • Bacillus (aertrycke) (choleraesuis) (paratyphosus) (suipestifer)
            • botulinus

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Foodborne Botulism

    botulism that is caused by consuming food or beverage that contains the botulinum toxin.

Patient EducationClinical

Botulism

Botulism is a rare but serious illness. The cause is a toxin (poison) made by a bacterium called Clostridium botulinum. It occurs naturally in soil.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A05.1 to ICD-9-CMHistory

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

ICD-9-CM
005.1 Botulism food poisoning
Exact Match The mapping is direct, with no qualifiers.

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 A05.1Overview

Is A05.1 a billable code?

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

What MS-DRG does A05.1 group to?

When botulism food poisoning is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A05.1?

Under the General Equivalence Mappings, botulism food poisoning converts to ICD-9-CM 005.1 (botulism food poisoning). The mapping is a direct match.

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.