ICD-10-CM category
K51 Ulcerative colitis
K51 is a category, not a billable code. Report one of the 49 complete codes below.
K51.0…
7 codes
- K51.00Ulcerative (chronic) pancolitis without complications
- K51.011Ulcerative (chronic) pancolitis with rectal bleeding
- K51.012Ulcerative (chronic) pancolitis with intestinal obstruction
- K51.013Ulcerative (chronic) pancolitis with fistula
- K51.014Ulcerative (chronic) pancolitis with abscess
- K51.018Ulcerative (chronic) pancolitis with other complication
- K51.019Ulcerative (chronic) pancolitis with unspecified complications
K51.2…
7 codes
- K51.20Ulcerative (chronic) proctitis without complications
- K51.211Ulcerative (chronic) proctitis with rectal bleeding
- K51.212Ulcerative (chronic) proctitis with intestinal obstruction
- K51.213Ulcerative (chronic) proctitis with fistula
- K51.214Ulcerative (chronic) proctitis with abscess
- K51.218Ulcerative (chronic) proctitis with other complication
- K51.219Ulcerative (chronic) proctitis with unspecified complications
K51.3…
7 codes
- K51.30Ulcerative (chronic) rectosigmoiditis without complications
- K51.311Ulcerative (chronic) rectosigmoiditis with rectal bleeding
- K51.312Ulcerative (chronic) rectosigmoiditis with intestinal obstruction
- K51.313Ulcerative (chronic) rectosigmoiditis with fistula
- K51.314Ulcerative (chronic) rectosigmoiditis with abscess
- K51.318Ulcerative (chronic) rectosigmoiditis with other complication
- K51.319Ulcerative (chronic) rectosigmoiditis with unspecified complications
K51.4…
7 codes
- K51.40Inflammatory polyps of colon without complications
- K51.411Inflammatory polyps of colon with rectal bleeding
- K51.412Inflammatory polyps of colon with intestinal obstruction
- K51.413Inflammatory polyps of colon with fistula
- K51.414Inflammatory polyps of colon with abscess
- K51.418Inflammatory polyps of colon with other complication
- K51.419Inflammatory polyps of colon with unspecified complications
K51.5…
7 codes
- K51.50Left sided colitis without complications
- K51.511Left sided colitis with rectal bleeding
- K51.512Left sided colitis with intestinal obstruction
- K51.513Left sided colitis with fistula
- K51.514Left sided colitis with abscess
- K51.518Left sided colitis with other complication
- K51.519Left sided colitis with unspecified complications
K51.8…
7 codes
- K51.80Other ulcerative colitis without complications
- K51.811Other ulcerative colitis with rectal bleeding
- K51.812Other ulcerative colitis with intestinal obstruction
- K51.813Other ulcerative colitis with fistula
- K51.814Other ulcerative colitis with abscess
- K51.818Other ulcerative colitis with other complication
- K51.819Other ulcerative colitis with unspecified complications
K51.9…
7 codes
- K51.90Ulcerative colitis, unspecified, without complications
- K51.911Ulcerative colitis, unspecified with rectal bleeding
- K51.912Ulcerative colitis, unspecified with intestinal obstruction
- K51.913Ulcerative colitis, unspecified with fistula
- K51.914Ulcerative colitis, unspecified with abscess
- K51.918Ulcerative colitis, unspecified with other complication
- K51.919Ulcerative colitis, unspecified with unspecified complications
Outside the US? K51 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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