| K51.90 | Ulcerative colitis, unspecified, without complications | BILLABLE CODE |
| K51.91 | Ulcerative colitis, unspecified, with complications | NON-BILLABLE CODE |
| K51.911 | Ulcerative colitis, unspecified with rectal bleeding | BILLABLE CODE |
| K51.912 | Ulcerative colitis, unspecified with intestinal obstruction | BILLABLE CODE |
| K51.913 | Ulcerative colitis, unspecified with fistula | BILLABLE CODE |
| K51.914 | Ulcerative colitis, unspecified with abscess | BILLABLE CODE |
| K51.918 | Ulcerative colitis, unspecified with other complication | BILLABLE CODE |
| K51.919 | Ulcerative colitis, unspecified with unspecified complications | BILLABLE CODE |
