| K220 | Achalasia of cardia |
| K221 | Ulcer of esophagus |
| K2210 | Ulcer of esophagus without bleeding |
| K2211 | Ulcer of esophagus with bleeding |
| K222 | Esophageal obstruction |
| K223 | Perforation of esophagus |
| K224 | Dyskinesia of esophagus |
| K225 | Diverticulum of esophagus, acquired |
| K226 | Gastro-esophageal laceration-hemorrhage syndrome |
| K227 | Barrett's esophagus |
| K2270 | Barrett's esophagus without dysplasia |
| K2271 | Barrett's esophagus with dysplasia |
| K22710 | Barrett's esophagus with low grade dysplasia |
| K22711 | Barrett's esophagus with high grade dysplasia |
| K22719 | Barrett's esophagus with dysplasia, unspecified |
| K228 | Other specified diseases of esophagus |
| K2281 | Esophageal polyp |
| K2282 | Esophagogastric junction polyp |
| K2289 | Other specified disease of esophagus |
| K229 | Disease of esophagus, unspecified |
| K23 | Disorders of esophagus in diseases classified elsewhere |
| K25 | Gastric ulcer |
| K250 | Acute gastric ulcer with hemorrhage |
| K251 | Acute gastric ulcer with perforation |
| K252 | Acute gastric ulcer with both hemorrhage and perforation |
| K253 | Acute gastric ulcer without hemorrhage or perforation |
| K254 | Chronic or unspecified gastric ulcer with hemorrhage |
| K255 | Chronic or unspecified gastric ulcer with perforation |
| K256 | Chronic or unspecified gastric ulcer with both hemorrhage and perforation |
| K257 | Chronic gastric ulcer without hemorrhage or perforation |
| K259 | Gastric ulcer, unspecified as acute or chronic, without hemorrhage or perforation |
| K26 | Duodenal ulcer |
| K260 | Acute duodenal ulcer with hemorrhage |
| K261 | Acute duodenal ulcer with perforation |
| K262 | Acute duodenal ulcer with both hemorrhage and perforation |
| K263 | Acute duodenal ulcer without hemorrhage or perforation |
| K264 | Chronic or unspecified duodenal ulcer with hemorrhage |
| K265 | Chronic or unspecified duodenal ulcer with perforation |
| K266 | Chronic or unspecified duodenal ulcer with both hemorrhage and perforation |
| K267 | Chronic duodenal ulcer without hemorrhage or perforation |
| K269 | Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation |
| K27 | Peptic ulcer, site unspecified |
| K270 | Acute peptic ulcer, site unspecified, with hemorrhage |
| K271 | Acute peptic ulcer, site unspecified, with perforation |
| K272 | Acute peptic ulcer, site unspecified, with both hemorrhage and perforation |
| K273 | Acute peptic ulcer, site unsp, w/o hemorrhage or perforation Acute peptic ulcer, site unspecified, without hemorrhage or perforation |
| K274 | Chronic or unspecified peptic ulcer, site unspecified, with hemorrhage |
| K275 | Chronic or unspecified peptic ulcer, site unspecified, with perforation |
| K276 | Chronic or unspecified peptic ulcer, site unspecified, with both hemorrhage and perforation |
| K277 | Chronic peptic ulcer, site unspecified, without hemorrhage or perforation |