| Code | Description | Billable | Details | 
|---|---|---|---|
| K31.0 | Acute dilatation of stomach | ||
| K31.1 | Adult hypertrophic pyloric stenosis | Type 1 Excludes (1) | |
| K31.2 | Hourglass stricture and stenosis of stomach | Type 1 Excludes (2) | |
| K31.3 | Pylorospasm, not elsewhere classified | Type 1 Excludes (3) | |
| K31.4 | Gastric diverticulum | Type 1 Excludes (1) | |
| K31.5 | Obstruction of duodenum | Type 1 Excludes (1) | |
| K31.6 | Fistula of stomach and duodenum | ||
| K31.7 | Polyp of stomach and duodenum | Type 1 Excludes (1) | |
| K31.8 | Other specified diseases of stomach and duodenum | ||
| K31.81 | Angiodysplasia of stomach and duodenum | 
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