K29.0
Acute gastritis
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 12 never code together
K29code
K00-K95chapter
Excludes2
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
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 2
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 8 same parent — K29
K29.2 Alcoholic gastritis category K29.3 Chronic superficial gastritis category K29.4 Chronic atrophic gastritis category K29.5 Unspecified chronic gastritis category K29.6 Other gastritis category K29.7 Gastritis, unspecified category K29.8 Duodenitis category K29.9 Gastroduodenitis, unspecified category
Subordinate codes 2
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.