ICD-10-CM · Chapter 11 · K00-K95
K51 Ulcerative colitis
Excludes 1 (cannot be coded together)
- Crohn's disease [regional enteritis] (K50.-)
Use Additional Code
- code to identify any associated fistulas, if applicable:
- anal fistula (K60.3-)
- anorectal fistula (K60.5-)
- rectal fistula (K60.4-)
- code to identify manifestations, such as:
- pyoderma gangrenosum (L88)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| K51..0 | Ulcerative (chronic) pancolitis | No |
| K51..00 | Ulcerative (chronic) pancolitis without complications | Yes |
| K51..01 | Ulcerative (chronic) pancolitis with complications | No |
| K51..011 | Ulcerative (chronic) pancolitis with rectal bleeding | Yes |
| K51..012 | Ulcerative (chronic) pancolitis with intestinal obstruction | Yes |
| K51..013 | Ulcerative (chronic) pancolitis with fistula | Yes |
| K51..014 | Ulcerative (chronic) pancolitis with abscess | Yes |
| K51..018 | Ulcerative (chronic) pancolitis with other complication | Yes |
| K51..019 | Ulcerative (chronic) pancolitis with unspecified complications | Yes |
| K51..2 | Ulcerative (chronic) proctitis | No |
| K51..20 | Ulcerative (chronic) proctitis without complications | Yes |
| K51..21 | Ulcerative (chronic) proctitis with complications | No |
| K51..211 | Ulcerative (chronic) proctitis with rectal bleeding | Yes |
| K51..212 | Ulcerative (chronic) proctitis with intestinal obstruction | Yes |
| K51..213 | Ulcerative (chronic) proctitis with fistula | Yes |
| K51..214 | Ulcerative (chronic) proctitis with abscess | Yes |
| K51..218 | Ulcerative (chronic) proctitis with other complication | Yes |
| K51..219 | Ulcerative (chronic) proctitis with unspecified complications | Yes |
| K51..3 | Ulcerative (chronic) rectosigmoiditis | No |
| K51..30 | Ulcerative (chronic) rectosigmoiditis without complications | Yes |
| K51..31 | Ulcerative (chronic) rectosigmoiditis with complications | No |
| K51..311 | Ulcerative (chronic) rectosigmoiditis with rectal bleeding | Yes |
| K51..312 | Ulcerative (chronic) rectosigmoiditis with intestinal obstruction | Yes |
| K51..313 | Ulcerative (chronic) rectosigmoiditis with fistula | Yes |
| K51..314 | Ulcerative (chronic) rectosigmoiditis with abscess | Yes |
| K51..318 | Ulcerative (chronic) rectosigmoiditis with other complication | Yes |
| K51..319 | Ulcerative (chronic) rectosigmoiditis with unspecified complications | Yes |
| K51..4 | Inflammatory polyps of colon | No |
| K51..40 | Inflammatory polyps of colon without complications | Yes |
| K51..41 | Inflammatory polyps of colon with complications | No |
| K51..411 | Inflammatory polyps of colon with rectal bleeding | Yes |
| K51..412 | Inflammatory polyps of colon with intestinal obstruction | Yes |
| K51..413 | Inflammatory polyps of colon with fistula | Yes |
| K51..414 | Inflammatory polyps of colon with abscess | Yes |
| K51..418 | Inflammatory polyps of colon with other complication | Yes |
| K51..419 | Inflammatory polyps of colon with unspecified complications | Yes |
| K51..5 | Left sided colitis | No |
| K51..50 | Left sided colitis without complications | Yes |
| K51..51 | Left sided colitis with complications | No |
| K51..511 | Left sided colitis with rectal bleeding | Yes |
| K51..512 | Left sided colitis with intestinal obstruction | Yes |
| K51..513 | Left sided colitis with fistula | Yes |
| K51..514 | Left sided colitis with abscess | Yes |
| K51..518 | Left sided colitis with other complication | Yes |
| K51..519 | Left sided colitis with unspecified complications | Yes |
| K51..8 | Other ulcerative colitis | No |
| K51..80 | Other ulcerative colitis without complications | Yes |
| K51..81 | Other ulcerative colitis with complications | No |
| K51..811 | Other ulcerative colitis with rectal bleeding | Yes |
| K51..812 | Other ulcerative colitis with intestinal obstruction | Yes |
| K51..813 | Other ulcerative colitis with fistula | Yes |
| K51..814 | Other ulcerative colitis with abscess | Yes |
| K51..818 | Other ulcerative colitis with other complication | Yes |
| K51..819 | Other ulcerative colitis with unspecified complications | Yes |
| K51..9 | Ulcerative colitis, unspecified | No |
| K51..90 | Ulcerative colitis, unspecified, without complications | Yes |
| K51..91 | Ulcerative colitis, unspecified, with complications | No |
| K51..911 | Ulcerative colitis, unspecified with rectal bleeding | Yes |
| K51..912 | Ulcerative colitis, unspecified with intestinal obstruction | Yes |
| K51..913 | Ulcerative colitis, unspecified with fistula | Yes |
| K51..914 | Ulcerative colitis, unspecified with abscess | Yes |
| K51..918 | Ulcerative colitis, unspecified with other complication | Yes |
| K51..919 | Ulcerative colitis, unspecified with unspecified complications | Yes |
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category K51:
- Ulcerative Colitis — Colitis ulcerosa
Last reviewed: September 2026