| K26 | Duodenal ulcer | NON-BILLABLE CODE |
| K26.0 | Acute duodenal ulcer with hemorrhage | BILLABLE CODE |
| K26.1 | Acute duodenal ulcer with perforation | BILLABLE CODE |
| K26.2 | Acute duodenal ulcer with both hemorrhage and perforation | BILLABLE CODE |
| K26.3 | Acute duodenal ulcer without hemorrhage or perforation | BILLABLE CODE |
| K26.4 | Chronic or unspecified duodenal ulcer with hemorrhage | BILLABLE CODE |
| K26.5 | Chronic or unspecified duodenal ulcer with perforation | BILLABLE CODE |
| K26.6 | Chronic or unspecified duodenal ulcer with both hemorrhage and perforation | BILLABLE CODE |
| K26.9 | Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation | BILLABLE CODE |
