All ICD10 Codes
Chapter 11

K00–K95: Diseases of the Digestive System

Diseases of the Digestive System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
All CodesBillable Only
Internal Codes
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  • K50.919—

    Crohn's disease, unspecified, with unspecified complications

  • K51.00—

    Ulcerative (chronic) pancolitis without complications

  • K51.011—

    Ulcerative (chronic) pancolitis with rectal bleeding

  • K51.012—

    Ulcerative (chronic) pancolitis with intestinal obstruction

  • K51.013—

    Ulcerative (chronic) pancolitis with fistula

  • K51.014—

    Ulcerative (chronic) pancolitis with abscess

  • K51.018—

    Ulcerative (chronic) pancolitis with other complication

  • K51.019—

    Ulcerative (chronic) pancolitis with unspecified complications

  • K51.20—

    Ulcerative (chronic) proctitis without complications

  • K51.211—

    Ulcerative (chronic) proctitis with rectal bleeding

  • K51.212—

    Ulcerative (chronic) proctitis with intestinal obstruction

  • K51.213—

    Ulcerative (chronic) proctitis with fistula

  • K51.214—

    Ulcerative (chronic) proctitis with abscess

  • K51.218—

    Ulcerative (chronic) proctitis with other complication

  • K51.219—

    Ulcerative (chronic) proctitis with unspecified complications

  • K51.30—

    Ulcerative (chronic) rectosigmoiditis without complications

  • K51.311—

    Ulcerative (chronic) rectosigmoiditis with rectal bleeding

  • K51.312—

    Ulcerative (chronic) rectosigmoiditis with intestinal obstruction

  • K51.313—

    Ulcerative (chronic) rectosigmoiditis with fistula

  • K51.314—

    Ulcerative (chronic) rectosigmoiditis with abscess

  • K51.318—

    Ulcerative (chronic) rectosigmoiditis with other complication

  • K51.319—

    Ulcerative (chronic) rectosigmoiditis with unspecified complications

  • K51.40—

    Inflammatory polyps of colon without complications

  • K51.411—

    Inflammatory polyps of colon with rectal bleeding

  • K51.412—

    Inflammatory polyps of colon with intestinal obstruction

  • K51.413—

    Inflammatory polyps of colon with fistula

  • K51.414—

    Inflammatory polyps of colon with abscess

  • K51.418—

    Inflammatory polyps of colon with other complication

  • K51.419—

    Inflammatory polyps of colon with unspecified complications

  • K51.50—

    Left sided colitis without complications

  • K51.511—

    Left sided colitis with rectal bleeding

  • K51.512—

    Left sided colitis with intestinal obstruction

  • K51.513—

    Left sided colitis with fistula

  • K51.514—

    Left sided colitis with abscess

  • K51.518—

    Left sided colitis with other complication

  • K51.519—

    Left sided colitis with unspecified complications

  • K51.80—

    Other ulcerative colitis without complications

  • K51.811—

    Other ulcerative colitis with rectal bleeding

  • K51.812—

    Other ulcerative colitis with intestinal obstruction

  • K51.813—

    Other ulcerative colitis with fistula

  • K51.814—

    Other ulcerative colitis with abscess

  • K51.818—

    Other ulcerative colitis with other complication

  • K51.819—

    Other ulcerative colitis with unspecified complications

  • K51.90—

    Ulcerative colitis, unspecified, without complications

  • K51.911—

    Ulcerative colitis, unspecified with rectal bleeding

  • K51.912—

    Ulcerative colitis, unspecified with intestinal obstruction

  • K51.913—

    Ulcerative colitis, unspecified with fistula

  • K51.914—

    Ulcerative colitis, unspecified with abscess

  • K51.918—

    Ulcerative colitis, unspecified with other complication

  • K51.919—

    Ulcerative colitis, unspecified with unspecified complications

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