A04
Other bacterial intestinal infections
A04 is a non-billable ICD-10-CM code category for other bacterial intestinal infections. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are A04.0 Enteropathogenic Escherichia coli infection, A04.1 Enterotoxigenic Escherichia coli infection, A04.2 Enteroinvasive Escherichia coli infection, A04.3 Enterohemorrhagic Escherichia coli infection and 6 more. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 5 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (5 notes)
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- diseases generally recognized as communicable or transmissible
More specific codes under A04 10
- A04.0Enteropathogenic Escherichia coli infectionBillable
- A04.1Enterotoxigenic Escherichia coli infectionBillable
- A04.2Enteroinvasive Escherichia coli infectionBillable
- A04.3Enterohemorrhagic Escherichia coli infectionBillable
- A04.4Other intestinal Escherichia coli infectionsBillable
- A04.5Campylobacter enteritisBillable
- A04.6Enteritis due to Yersinia enterocoliticaBillable
- A04.7Enterocolitis due to Clostridium difficileHeader
- A04.8Other specified bacterial intestinal infectionsBillable
- A04.9Bacterial intestinal infection, unspecifiedBillable