ICD-10-CM category K31: Other diseases of stomach and duodenum
Category K31 is a heading in chapter 11 (Diseases of the digestive system (K00-K95)), section Diseases of esophagus, stomach and duodenum (K20-K31). It is not billable; report one of the 26 complete codes below.
Notes that apply to every K31 code
- Includes
- functional disorders of stomach
- Excludes2 (not part of this condition, may be coded together)
- diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
- diverticulum of duodenum (K57.00-K57.13)
Billable codes in K31
| Code | Description |
|---|---|
| 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 |
| K31.811 | Angiodysplasia of stomach and duodenum with bleeding |
| K31.819 | Angiodysplasia of stomach and duodenum without bleeding |
| K31.82 | Dieulafoy lesion (hemorrhagic) of stomach and duodenum |
| K31.83 | Achlorhydria |
| K31.84 | Gastroparesis |
| K31.89 | Other diseases of stomach and duodenum |
| K31.9 | Disease of stomach and duodenum, unspecified |
| K31.A0 | Gastric intestinal metaplasia, unspecified |
| K31.A11 | Gastric intestinal metaplasia without dysplasia, involving the antrum |
| K31.A12 | Gastric intestinal metaplasia without dysplasia, involving the body (corpus) |
| K31.A13 | Gastric intestinal metaplasia without dysplasia, involving the fundus |
| K31.A14 | Gastric intestinal metaplasia without dysplasia, involving the cardia |
| K31.A15 | Gastric intestinal metaplasia without dysplasia, involving multiple sites |
| K31.A19 | Gastric intestinal metaplasia without dysplasia, unspecified site |
| K31.A21 | Gastric intestinal metaplasia with low grade dysplasia |
| K31.A22 | Gastric intestinal metaplasia with high grade dysplasia |
| K31.A29 | Gastric intestinal metaplasia with dysplasia, unspecified |
| K31.B | Hypertrophic pyloric stenosis, in childhood |
Sources
Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.
- ICD-10-CM FY2027 tabular order file (category titles)Version FY2027 · effective 2026-10-01 · file icd10cm_order_2027.txtSHA-256 38981fb2c1226e2b…
- ICD-10-CM FY2027 tabular list (chapter titles and ranges)Version FY2027 · effective 2026-10-01 · file 2027-code-tables-tabular-index.zipSHA-256 37baa476323714be…
- ICD-10-CM FY2027 code descriptions addenda (codes added, deleted and revised)Version FY2027 · effective 2026-10-01 · file icd10cm_codes_addenda_2027.txtSHA-256 cfba025073235af4…
- ICD-10 MS-DRG Definitions Manual v44 (text)Version v44 · effective 2026-10-01 · file fy2027-fr-icd10-ms-drg-definitions-manual-files-v44.zipSHA-256 ae4f6c11727fe91f…
- IPPS FY2027 Tables 6A-6K: new, invalid and revised ICD-10-CM/PCS codes, CC/MCC list changes and CC exclusionsVersion FY2027 (final rule; not reissued by CN3) · effective 2026-10-01 · file fy2027-ipps-fr-tables-6a-6k.zipSHA-256 ca0af87b0869a405…
- ICD-10-CM FY2027 POA-exempt codes (full list, additions, deletions and revisions)Version FY2027 · effective 2026-10-01 · file 2027-poa-exempt-codes.zipSHA-256 03f55091045024d0…
- ICD-10-CM to CMS-HCC V28 mappings, payment year 2027 initialVersion PY2027 initial ICD-10-CM mappings (dates of service 2026) · effective 2027-01-01 · file 2027 Initial ICD-10-CM Mappings.csvSHA-256 9c260b06d0dd2806…
- Medicare Coverage Database, current Billing and Coding Articles exportVersion MCD release 2026-10-08 · effective 2026-10-04 · file article.csvSHA-256 5e95c4a8ac3664be…
Codes from the FY2027 ICD-10-CM files (all chapters). Report the code that matches the documentation and the Official Guidelines; this list is not coding advice.