Includes:

  • noninfective inflammatory bowel disease

Excludes1

  • irritable bowel syndrome (K58.-)
  • megacolon (K59.3-)
  1. K51 Ulcerative colitis

    Use additional code to identify manifestations, such as:
    pyoderma gangrenosum (L88)

    Excludes1

    • Crohn's disease [regional enteritis] (K50.-)
    1. K51.0 Ulcerative (chronic) pancolitis

      Inclusion term(s):

      • Backwash ileitis
      1. K51.00 Ulcerative (chronic) pancolitis without complications

        Inclusion term(s):

        • Ulcerative (chronic) pancolitis NOS
      2. K51.01 Ulcerative (chronic) pancolitis with 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
    2. K51.2 Ulcerative (chronic) proctitis

      1. K51.20 Ulcerative (chronic) proctitis without complications

        Inclusion term(s):

        • Ulcerative (chronic) proctitis NOS
      2. K51.21 Ulcerative (chronic) proctitis with 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
    3. K51.3 Ulcerative (chronic) rectosigmoiditis

      1. K51.30 Ulcerative (chronic) rectosigmoiditis without complications

        Inclusion term(s):

        • Ulcerative (chronic) rectosigmoiditis NOS
      2. K51.31 Ulcerative (chronic) rectosigmoiditis with 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
    4. K51.4 Inflammatory polyps of colon

      1. K51.40 Inflammatory polyps of colon without complications

        Inclusion term(s):

        • Inflammatory polyps of colon NOS
      2. K51.41 Inflammatory polyps of colon with 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
    5. K51.5 Left sided colitis

      Inclusion term(s):

      • Left hemicolitis
      1. K51.50 Left sided colitis without complications

        Inclusion term(s):

        • Left sided colitis NOS
      2. K51.51 Left sided colitis with 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
    6. K51.8 Other ulcerative colitis

      1. K51.80 Other ulcerative colitis without complications

      2. K51.81 Other ulcerative colitis with 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
    7. K51.9 Ulcerative colitis, unspecified

      1. K51.90 Ulcerative colitis, unspecified, without complications

      2. K51.91 Ulcerative colitis, unspecified, with 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
Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.