| K51.20 | Ulcerative (chronic) proctitis without complications | BILLABLE CODE |
| K51.21 | Ulcerative (chronic) proctitis with complications | NON-BILLABLE CODE |
| K51.211 | Ulcerative (chronic) proctitis with rectal bleeding | BILLABLE CODE |
| K51.212 | Ulcerative (chronic) proctitis with intestinal obstruction | BILLABLE CODE |
| K51.213 | Ulcerative (chronic) proctitis with fistula | BILLABLE CODE |
| K51.214 | Ulcerative (chronic) proctitis with abscess | BILLABLE CODE |
| K51.218 | Ulcerative (chronic) proctitis with other complication | BILLABLE CODE |
| K51.219 | Ulcerative (chronic) proctitis with unspecified complications | BILLABLE CODE |
