| K25 | Gastric ulcer |
| K25.0 | Acute gastric ulcer with hemorrhage |
| K25.1 | Acute gastric ulcer with perforation |
| K25.2 | Acute gastric ulcer with both hemorrhage and perforation |
| K25.3 | Acute gastric ulcer without hemorrhage or perforation |
| K25.4 | Chronic or unspecified gastric ulcer with hemorrhage |
| K25.5 | Chronic or unspecified gastric ulcer with perforation |
| K25.6 | Chronic or unspecified gastric ulcer with both hemorrhage and perforation |
| K25.7 | Chronic gastric ulcer without hemorrhage or perforation |
| K25.9 | Gastric ulcer, unspecified as acute or chronic, without hemorrhage or perforation |
| K26 | Duodenal ulcer |
| K26.0 | Acute duodenal ulcer with hemorrhage |
| K26.1 | Acute duodenal ulcer with perforation |
| K26.2 | Acute duodenal ulcer with both hemorrhage and perforation |
| K26.3 | Acute duodenal ulcer without hemorrhage or perforation |
| K26.4 | Chronic or unspecified duodenal ulcer with hemorrhage |
| K26.5 | Chronic or unspecified duodenal ulcer with perforation |
| K26.6 | Chronic or unspecified duodenal ulcer with both hemorrhage and perforation |
| K26.7 | Chronic duodenal ulcer without hemorrhage or perforation |
| K26.9 | Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation |
| K27 | Peptic ulcer, site unspecified |
| K27.0 | Acute peptic ulcer, site unspecified, with hemorrhage |
| K27.1 | Acute peptic ulcer, site unspecified, with perforation |
| K27.2 | Acute peptic ulcer, site unspecified, with both hemorrhage and perforation |
| K27.3 | Acute peptic ulcer, site unspecified, without hemorrhage or perforation |
| K27.4 | Chronic or unspecified peptic ulcer, site unspecified, with hemorrhage |
| K27.5 | Chronic or unspecified peptic ulcer, site unspecified, with perforation |
| K27.6 | Chronic or unspecified peptic ulcer, site unspecified, with both hemorrhage and perforation |
| K27.7 | Chronic peptic ulcer, site unspecified, without hemorrhage or perforation |
| K27.9 | Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation |
| K28 | Gastrojejunal ulcer |
| K28.0 | Acute gastrojejunal ulcer with hemorrhage |
| K28.1 | Acute gastrojejunal ulcer with perforation |
| K28.2 | Acute gastrojejunal ulcer with both hemorrhage and perforation |
| K28.3 | Acute gastrojejunal ulcer without hemorrhage or perforation |
| K28.4 | Chronic or unspecified gastrojejunal ulcer with hemorrhage |
| K28.5 | Chronic or unspecified gastrojejunal ulcer with perforation |
| K28.6 | Chronic or unspecified gastrojejunal ulcer with both hemorrhage and perforation |
| K28.7 | Chronic gastrojejunal ulcer without hemorrhage or perforation |
| K28.9 | Gastrojejunal ulcer, unspecified as acute or chronic, without hemorrhage or perforation |