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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  • 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

  • K51.5—

    Left sided colitis

  • K51.50—

    Left sided colitis without complications

  • 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

  • K51.8—

    Other ulcerative colitis

  • K51.80—

    Other ulcerative colitis without complications

  • 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

  • K51.9—

    Ulcerative colitis, unspecified

  • K51.90—

    Ulcerative colitis, unspecified, without complications

  • 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

  • K52—

    Other and unspecified noninfective gastroenteritis and colitis

  • K52.0—

    Gastroenteritis and colitis due to radiation

  • K52.1—

    Toxic gastroenteritis and colitis

  • K52.2—

    Allergic and dietetic gastroenteritis and colitis

  • K52.21—

    Food protein-induced enterocolitis syndrome

  • K52.22—

    Food protein-induced enteropathy

  • K52.29—

    Other allergic and dietetic gastroenteritis and colitis

  • K52.3—

    Indeterminate colitis

  • K52.8—

    Other specified noninfective gastroenteritis and colitis

  • K52.81—

    Eosinophilic gastritis or gastroenteritis

  • K52.82—

    Eosinophilic colitis

  • K52.83—

    Microscopic colitis

  • K52.831—

    Collagenous colitis

  • K52.832—

    Lymphocytic colitis

  • K52.838—

    Other microscopic colitis

  • K52.839—

    Microscopic colitis, unspecified

  • K52.89—

    Other specified noninfective gastroenteritis and colitis

  • K52.9—

    Noninfective gastroenteritis and colitis, unspecified

  • K55—

    Vascular disorders of intestine

  • K55.0—

    Acute vascular disorders of intestine

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