| ICD Code | Description |
|---|---|
| K20 | Esophagitis |
| K21 | Gastro-esophageal reflux disease |
| K22 | Other diseases of esophagus |
| K23 | Disorders of esophagus in diseases classified elsewhere |
| K25 | Gastric ulcer |
| K26 | Duodenal ulcer |
| K27 | Peptic ulcer, site unspecified |
| K28 | Gastrojejunal ulcer |
| K29 | Gastritis and duodenitis |
| K30 | Functional dyspepsia |
| K31 | Other diseases of stomach and duodenum |