Other bacterial intestinal infections (A04) ICD-10-CM
The A04 code range covers other bacterial intestinal infections with 13 ICD-10-CM diagnosis codes. 11 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the A04 Range 13 codes · 11 billable
- A04 Other bacterial intestinal infectionsNon-billable
- A04.0 Enteropathogenic Escherichia coli infection
- A04.1 Enterotoxigenic Escherichia coli infection
- A04.2 Enteroinvasive Escherichia coli infection
- A04.3 Enterohemorrhagic Escherichia coli infection
- A04.4 Other intestinal Escherichia coli infections
- A04.5 Campylobacter enteritis
- A04.6 Enteritis due to Yersinia enterocolitica
- A04.7 Enterocolitis due to Clostridium difficileNon-billable
- A04.71 Enterocolitis due to Clostridium difficile, recurrent
- A04.72 Enterocolitis due to Clostridium difficile, not specified as recurrent
- A04.8 Other specified bacterial intestinal infections
- A04.9 Bacterial intestinal infection, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A04 range.
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.
About the A04 Code Range
These bacterial intestinal infections include those attributed to Escherichia coli, Campylobacter, Yersinia enterocolitica, and Clostridium difficile.
The Escherichia coli codes separate enteropathogenic (A04.0), enterotoxigenic (A04.1), enteroinvasive (A04.2), enterohemorrhagic (A04.3), and other intestinal infections (A04.4).
Separate codes identify Campylobacter enteritis (A04.5) and enteritis due to Yersinia enterocolitica (A04.6). Clostridium difficile enterocolitis splits into recurrent (A04.71) and not specified as recurrent (A04.72). The remaining codes distinguish other specified (A04.8) from unspecified (A04.9) bacterial intestinal infections.
Questions About This Page
How many billable codes are in the A04 range?
Of the 13 codes in this range, 11 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the A04 range classify?
The range classifies other bacterial intestinal infections. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
