K31.8
Other specified diseases of stomach and duodenum
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 11 never code together
K31code
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
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 1
K31code
Includes
- functional disorders of stomach
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 10 same parent — K31
K31.0 Acute dilatation of stomach K31.1 Adult hypertrophic pyloric stenosis K31.2 Hourglass stricture and stenosis of stomach K31.3 Pylorospasm, not elsewhere classified K31.4 Gastric diverticulum K31.5 Obstruction of duodenum K31.6 Fistula of stomach and duodenum K31.7 Polyp of stomach and duodenum K31.9 Disease of stomach and duodenum, unspecified K31.A Gastric intestinal metaplasia category
Subordinate codes 5
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.