| K31 | Other diseases of stomach and duodenum |
| | Acute dilatation of stomach |
| | Adult hypertrophic pyloric stenosis |
| | Hourglass stricture and stenosis of stomach |
| | Pylorospasm, not elsewhere classified |
| | Gastric diverticulum |
| | Obstruction of duodenum |
| | Fistula of stomach and duodenum |
| | Polyp of stomach and duodenum |
| | Other specified diseases of stomach and duodenum |
| | Angiodysplasia of stomach and duodenum |
| | Angiodysplasia of stomach and duodenum, with bleeding |
| | Angiodysplasia of stomach and duodenum, without bleeding |
| | Dieulafoy lesion (hemorrhagic) of stomach and duodenum |
| | Achlorhydria |
| | Gastroparesis |
| | Other diseases of stomach and duodenum |
| | Disease of stomach and duodenum, unspecified |
| | Gastric intestinal metaplasia |
| | Gastric intestinal metaplasia, unspecified |
| | Gastric intestinal metaplasia without dysplasia |
| | Gastric intestinal metaplasia without dysplasia, involving the antrum |
| | Gastric intestinal metaplasia without dysplasia, involving the body (corpus) |
| | Gastric intestinal metaplasia without dysplasia, involving the fundus |
| | Gastric intestinal metaplasia without dysplasia, involving the cardia |
| | Gastric intestinal metaplasia without dysplasia, involving multiple sites |
| | Gastric intestinal metaplasia without dysplasia, unspecified site |
| | Gastric intestinal metaplasia with dysplasia |
| | Gastric intestinal metaplasia with low grade dysplasia |
| | Gastric intestinal metaplasia with high grade dysplasia |
| | Gastric intestinal metaplasia with dysplasia, unspecified |
