A04.9
Bacterial intestinal infection, unspecified
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 9 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 7 never code together
A04code
A00-B99chapter
Excludes1
- certain localized infections - see body system-related chapters
Excludes2
- carrier or suspected carrier of infectious disease (Z22.-)Z22.-
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)O98.-
- infectious and parasitic diseases specific to the perinatal period (P35-P39)P35-P39
- influenza and other acute respiratory infections (J00-J22)J00-J22
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 3
Index entries leading here 3
Alongside this code 9 same parent — A04
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 difficile category A04.8 Other specified bacterial intestinal infections
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.