2026 ICD-10-CM Diagnosis Code A04.5Campylobacter enteritis

ICD-10-CM Codes›A00–B99›A00-A09›A04

ICD-10-CM A04.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A04.5 is a billable ICD-10-CM diagnosis code for campylobacter enteritis. 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 campylobacter colitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Intestinal infection.

Code Identity

ICD-10-CM Code
A04.5
Billable Status
Yes — Valid for Submission
Code Describes
Campylobacter enteritis
Short Description
Campylobacter enteritis
Same as the full description in the CMS dataset.
Parent Code
A04
Other bacterial intestinal infections

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA04Other bacterial intestinal infections
This CodeA04.5Campylobacter enteritis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Campylobacter colitis
  • Campylobacter jejuni or Campylobacter coli
  • Campylobacteriosis
  • Enteric campylobacteriosis
  • Intestinal infection caused by Campylobacter coli
  • Intestinal infection caused by Campylobacter jejuni

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.

    • Diarrhea, diarrheal(disease) (infantile) (inflammatory)
      • due to
        • Campylobacter
    • Enteritis(acute) (diarrheal) (hemorrhagic) (noninfective)
      • infectious NOS
        • due to
          • Campylobacter
    • Infection, infected, infective(opportunistic)
      • Campylobacter, intestinal

Clinical ClassificationClinical

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

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG001
Intestinal infection
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Campylobacter Enteritis

    a gastrointestinal infection attributed to the bacteria campylobacter. it is usually contracted by consuming raw or undercooked poultry or consuming a food that has been in contact with raw poultry. it is characterized by abdominal pain, fever, and diarrhea and usually resolves in two to five days.

Patient EducationClinical

Foodborne Illness

Each year, around 48 million people in the United States get sick from contaminated food. Common causes include bacteria and viruses. Less often, the cause may be a parasite or a harmful chemical, such as a high amount of pesticides. Symptoms of foodborne illness depend on the cause. They can be mild or serious. They usually include:

Read the full article at MedlinePlus

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

Convert A04.5 to ICD-9-CMHistory

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

ICD-9-CM
008.43 Int infec campylobacter
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 A04.5Overview

Is A04.5 (Other bacterial intestinal infections) a billable code?

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

What MS-DRG does A04.5 group to?

When campylobacter enteritis 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 A04.5?

Under the General Equivalence Mappings, campylobacter enteritis converts to ICD-9-CM 008.43 (int infec campylobacter). 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.