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 2026, 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
About the A04 Code Range
ICD-10 codes in the A04 section classify various bacterial intestinal infections caused by different types of bacteria, primarily Escherichia coli strains, Campylobacter, Yersinia enterocolitica, Clostridium difficile, and other specified bacteria. These codes help identify specific infections like enteropathogenic, enterotoxigenic, and enterohemorrhagic E. coli infections, Campylobacter enteritis, and Clostridium difficile colitis.
This section is used when coding infections such as Escherichia coli colitis (e.g., A04.0 for enteropathogenic E. coli, or A04.3 for enterohemorrhagic E. coli, known for causing hemorrhagic colitis), and traveler’s diarrhea caused by enterotoxigenic E. coli (A04.1). It also covers Campylobacter jejuni or coli infections (A04.5), Yersinia enterocolitica enteritis (A04.6), as well as enterocolitis due to Clostridium difficile, including recurrent infections (A04.7 and subcodes). Additionally, A04.8 encompasses other less common bacterial intestinal infections caused by various bacteria such as Staphylococcus aureus, Klebsiella, and Helicobacter. The unspecified bacterial intestinal infection code A04.9 covers cases when the exact bacteria are unknown but symptoms show bacterial intestinal infection.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
