A09
Infectious gastroenteritis and colitis, unspecified
Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 10 never code together
A09code
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 5
Index entries leading here 13
- Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) A09
- arthritis A09
- Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) M19.90
- in (due to)
- enteritis, infectious NEC A09
- in (due to)
- Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) K52.9
- regional — see Enteritis, regional, large intestine
- infectious A09
- regional — see Enteritis, regional, large intestine
- Diarrhea, diarrheal (disease) (infantile) (inflammatory) R19.7
- Disease, diseased — see also Syndrome
- diarrheal, infectious NEC A09
- Ulcer, ulcerated, ulcerating, ulceration, ulcerative
- dysenteric A09
- Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) K52.9
- Enterocolitis K52.9
- infectious NEC A09
- Gastroenteritis (acute) (chronic) (noninfectious) K52.9
- epidemic (infectious) A09
- Gastroenteropathy K52.9
- infectious A09
- Ileitis (chronic) (noninfectious) K52.9
- infectious A09
- Ileocolitis K52.9
- infectious A09
- Sigmoiditis K52.9
- infectious A09
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.