| K279 | Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation |
| K28 | Gastrojejunal ulcer |
| K280 | Acute gastrojejunal ulcer with hemorrhage |
| K281 | Acute gastrojejunal ulcer with perforation |
| K282 | Acute gastrojejunal ulcer with both hemorrhage and perforation |
| K283 | Acute gastrojejunal ulcer without hemorrhage or perforation |
| K284 | Chronic or unspecified gastrojejunal ulcer with hemorrhage |
| K285 | Chronic or unspecified gastrojejunal ulcer with perforation |
| K286 | Chronic or unspecified gastrojejunal ulcer with both hemorrhage and perforation |
| K287 | Chronic gastrojejunal ulcer without hemorrhage or perforation |
| K289 | Gastrojejunal ulcer, unsp as acute or chr, w/o hemor or perf Gastrojejunal ulcer, unspecified as acute or chronic, without hemorrhage or perforation |
| K29 | Gastritis and duodenitis |
| K290 | Acute gastritis |
| K2900 | Acute gastritis without bleeding |
| K2901 | Acute gastritis with bleeding |
| K292 | Alcoholic gastritis |
| K2920 | Alcoholic gastritis without bleeding |
| K2921 | Alcoholic gastritis with bleeding |
| K293 | Chronic superficial gastritis |
| K2930 | Chronic superficial gastritis without bleeding |
| K2931 | Chronic superficial gastritis with bleeding |
| K294 | Chronic atrophic gastritis |
| K2940 | Chronic atrophic gastritis without bleeding |
| K2941 | Chronic atrophic gastritis with bleeding |
| K295 | Unspecified chronic gastritis |
| K2950 | Unspecified chronic gastritis without bleeding |
| K2951 | Unspecified chronic gastritis with bleeding |
| K296 | Other gastritis |
| K2960 | Other gastritis without bleeding |
| K2961 | Other gastritis with bleeding |
| K297 | Gastritis, unspecified |
| K2970 | Gastritis, unspecified, without bleeding |
| K2971 | Gastritis, unspecified, with bleeding |
| K298 | Duodenitis |
| K2980 | Duodenitis without bleeding |
| K2981 | Duodenitis with bleeding |
| K299 | Gastroduodenitis, unspecified |
| K2990 | Gastroduodenitis, unspecified, without bleeding |
| K2991 | Gastroduodenitis, unspecified, with bleeding |
| K30 | Functional dyspepsia |
| K31 | Other diseases of stomach and duodenum |
| K310 | Acute dilatation of stomach |
| K311 | Adult hypertrophic pyloric stenosis |
| K312 | Hourglass stricture and stenosis of stomach |
| K313 | Pylorospasm, not elsewhere classified |
| K314 | Gastric diverticulum |
| K315 | Obstruction of duodenum |
| K316 | Fistula of stomach and duodenum |
| K317 | Polyp of stomach and duodenum |
| K318 | Other specified diseases of stomach and duodenum |