K31.1
Adult hypertrophic pyloric stenosis
Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 12 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
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 6
Alongside this code 10 same parent — K31
K31.0 Acute dilatation of stomach 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 K31.8 Other specified diseases of stomach and duodenum category K31.9 Disease of stomach and duodenum, unspecified K31.A Gastric intestinal metaplasia category
Medications 1
MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.