K31: Other diseases of stomach and duodenum
Codes under K31 (Other diseases of stomach and duodenum). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| K31.0 | Acute dilatation of stomach | ✓ |
| K31.0 | Acute dilatation of stomach | ✓ |
| K31.1 | Adult hypertrophic pyloric stenosis | ✓ |
| K31.1 | Adult hypertrophic pyloric stenosis | ✓ |
| K31.2 | Hourglass stricture and stenosis of stomach | ✓ |
| K31.2 | Hourglass stricture and stenosis of stomach | ✓ |
| K31.3 | Pylorospasm, not elsewhere classified | ✓ |
| K31.3 | Pylorospasm, not elsewhere classified | ✓ |
| K31.4 | Gastric diverticulum | ✓ |
| K31.4 | Gastric diverticulum | ✓ |
| K31.5 | Obstruction of duodenum | ✓ |
| K31.5 | Obstruction of duodenum | ✓ |
| K31.6 | Fistula of stomach and duodenum | ✓ |
| K31.6 | Fistula of stomach and duodenum | ✓ |
| K31.7 | Polyp of stomach and duodenum | ✓ |
| K31.7 | Polyp of stomach and duodenum | ✓ |
| K31.8 | Other specified diseases of stomach and duodenum | — |
| K31.8 | Other specified diseases of stomach and duodenum | — |
| K31.9 | Disease of stomach and duodenum, unspecified | ✓ |
| K31.9 | Disease of stomach and duodenum, unspecified | ✓ |
| K31.81 | Angiodysplasia of stomach and duodenum | — |
| K31.81 | Angiodysplasia of stomach and duodenum | — |
| K31.82 | Dieulafoy lesion (hemorrhagic) of stomach and duodenum | ✓ |
| K31.82 | Dieulafoy lesion (hemorrhagic) of stomach and duodenum | ✓ |
| K31.83 | Achlorhydria | ✓ |
| K31.83 | Achlorhydria | ✓ |
| K31.84 | Gastroparesis | ✓ |
| K31.84 | Gastroparesis | ✓ |
| K31.89 | Other diseases of stomach and duodenum | ✓ |
| K31.89 | Other diseases of stomach and duodenum | ✓ |
| K31.811 | Angiodysplasia of stomach and duodenum with bleeding | ✓ |
| K31.811 | Angiodysplasia of stomach and duodenum with bleeding | ✓ |
| K31.819 | Angiodysplasia of stomach and duodenum without bleeding | ✓ |
| K31.819 | Angiodysplasia of stomach and duodenum without bleeding | ✓ |
| K31.A | Gastric intestinal metaplasia | — |
| K31.A | Gastric intestinal metaplasia | — |
| K31.A0 | Gastric intestinal metaplasia, unspecified | ✓ |
| K31.A0 | Gastric intestinal metaplasia, unspecified | ✓ |
| K31.A1 | Gastric intestinal metaplasia without dysplasia | — |
| K31.A1 | Gastric intestinal metaplasia without dysplasia | — |
| K31.A2 | Gastric intestinal metaplasia with dysplasia | — |
| K31.A2 | Gastric intestinal metaplasia with dysplasia | — |
| K31.A11 | Gastric intestinal metaplasia without dysplasia, involving the antrum | ✓ |
| K31.A11 | Gastric intestinal metaplasia without dysplasia, involving the antrum | ✓ |
| K31.A12 | Gastric intestinal metaplasia without dysplasia, involving the body (corpus) | ✓ |
| K31.A12 | Gastric intestinal metaplasia without dysplasia, involving the body (corpus) | ✓ |
| K31.A13 | Gastric intestinal metaplasia without dysplasia, involving the fundus | ✓ |
| K31.A13 | Gastric intestinal metaplasia without dysplasia, involving the fundus | ✓ |
| K31.A14 | Gastric intestinal metaplasia without dysplasia, involving the cardia | ✓ |
| K31.A14 | Gastric intestinal metaplasia without dysplasia, involving the cardia | ✓ |
| K31.A15 | Gastric intestinal metaplasia without dysplasia, involving multiple sites | ✓ |
| K31.A15 | Gastric intestinal metaplasia without dysplasia, involving multiple sites | ✓ |
| K31.A19 | Gastric intestinal metaplasia without dysplasia, unspecified site | ✓ |
| K31.A19 | Gastric intestinal metaplasia without dysplasia, unspecified site | ✓ |
| K31.A21 | Gastric intestinal metaplasia with low grade dysplasia | ✓ |
| K31.A21 | Gastric intestinal metaplasia with low grade dysplasia | ✓ |
| K31.A22 | Gastric intestinal metaplasia with high grade dysplasia | ✓ |
| K31.A22 | Gastric intestinal metaplasia with high grade dysplasia | ✓ |
| K31.A29 | Gastric intestinal metaplasia with dysplasia, unspecified | ✓ |
| K31.A29 | Gastric intestinal metaplasia with dysplasia, unspecified | ✓ |
| K31.B | Hypertrophic pyloric stenosis, in childhood | ✓ |
Frequently asked questions
What is ICD-10-CM code K31?
K31 is an ICD-10-CM category covering Other diseases of stomach and duodenum. It contains 61 more specific diagnosis codes, 51 of which are billable.
Is K31 a billable code?
No — K31 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example K31.0 — Acute dilatation of stomach). 51 of the 61 codes under K31 are billable.
What codes fall under K31?
K31 includes K31.0, K31.0, K31.1, K31.1, K31.2, plus 56 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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