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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  • K52.0—

    Gastroenteritis and colitis due to radiation

  • K52.1—

    Toxic 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

  • K52.81—

    Eosinophilic gastritis or gastroenteritis

  • K52.82—

    Eosinophilic 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

  • K55.011—

    Focal (segmental) acute (reversible) ischemia of small intestine

  • K55.012—

    Diffuse acute (reversible) ischemia of small intestine

  • K55.019—

    Acute (reversible) ischemia of small intestine, extent unspecified

  • K55.021—

    Focal (segmental) acute infarction of small intestine

  • K55.022—

    Diffuse acute infarction of small intestine

  • K55.029—

    Acute infarction of small intestine, extent unspecified

  • K55.031—

    Focal (segmental) acute (reversible) ischemia of large intestine

  • K55.032—

    Diffuse acute (reversible) ischemia of large intestine

  • K55.039—

    Acute (reversible) ischemia of large intestine, extent unspecified

  • K55.041—

    Focal (segmental) acute infarction of large intestine

  • K55.042—

    Diffuse acute infarction of large intestine

  • K55.049—

    Acute infarction of large intestine, extent unspecified

  • K55.051—

    Focal (segmental) acute (reversible) ischemia of intestine, part unspecified

  • K55.052—

    Diffuse acute (reversible) ischemia of intestine, part unspecified

  • K55.059—

    Acute (reversible) ischemia of intestine, part and extent unspecified

  • K55.061—

    Focal (segmental) acute infarction of intestine, part unspecified

  • K55.062—

    Diffuse acute infarction of intestine, part unspecified

  • K55.069—

    Acute infarction of intestine, part and extent unspecified

  • K55.1—

    Chronic vascular disorders of intestine

  • K55.20—

    Angiodysplasia of colon without hemorrhage

  • K55.21—

    Angiodysplasia of colon with hemorrhage

  • K55.30—

    Necrotizing enterocolitis, unspecified

  • K55.31—

    Stage 1 necrotizing enterocolitis

  • K55.32—

    Stage 2 necrotizing enterocolitis

  • K55.33—

    Stage 3 necrotizing enterocolitis

  • K55.8—

    Other vascular disorders of intestine

  • K55.9—

    Vascular disorder of intestine, unspecified

  • K56.0—

    Paralytic ileus

  • K56.1—

    Intussusception

  • K56.2—

    Volvulus

  • K56.3—

    Gallstone ileus

  • K56.41—

    Fecal impaction

  • K56.49—

    Other impaction of intestine

  • K56.50—

    Intestinal adhesions [bands], unspecified as to partial versus complete obstruction

  • K56.51—

    Intestinal adhesions [bands], with partial obstruction

  • K56.52—

    Intestinal adhesions [bands] with complete obstruction

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