1. K55 Vascular disorders of intestine

    Excludes1

    • necrotizing enterocolitis of newborn (P77.-)
    1. K55.0 Acute vascular disorders of intestine

      Inclusion term(s):

      • Infarction of appendices epiploicae
      • Mesenteric (artery) (vein) embolism
      • Mesenteric (artery) (vein) infarction
      • Mesenteric (artery) (vein) thrombosis
      1. K55.01 Acute (reversible) ischemia of small intestine

        • 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
      2. K55.02 Acute infarction of small intestine

        Inclusion term(s):

        • Gangrene of small intestine
        • Necrosis of small intestine
        • 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
      3. K55.03 Acute (reversible) ischemia of large intestine

        Inclusion term(s):

        • Acute fulminant ischemic colitis
        • Subacute ischemic colitis
        • 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
      4. K55.04 Acute infarction of large intestine

        Inclusion term(s):

        • Gangrene of large intestine
        • Necrosis of large intestine
        • 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
      5. K55.05 Acute (reversible) ischemia of intestine, part 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
      6. K55.06 Acute infarction of intestine, part unspecified

        Inclusion term(s):

        • Acute intestinal infarction
        • Gangrene of intestine
        • Necrosis of intestine
        • 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
    2. K55.1 Chronic vascular disorders of intestine

      Inclusion term(s):

      • Chronic ischemic colitis
      • Chronic ischemic enteritis
      • Chronic ischemic enterocolitis
      • Ischemic stricture of intestine
      • Mesenteric atherosclerosis
      • Mesenteric vascular insufficiency
    3. K55.2 Angiodysplasia of colon

      1. K55.20 Angiodysplasia of colon without hemorrhage

      2. K55.21 Angiodysplasia of colon with hemorrhage

    4. K55.3 Necrotizing enterocolitis

      1. K55.30 Necrotizing enterocolitis, unspecified

        Inclusion term(s):

        • Necrotizing enterocolitis, NOS
      2. K55.31 Stage 1 necrotizing enterocolitis

        Inclusion term(s):

        • Necrotizing enterocolitis without pneumatosis, without perforation
      3. K55.32 Stage 2 necrotizing enterocolitis

        Inclusion term(s):

        • Necrotizing enterocolitis with pneumatosis, without perforation
      4. K55.33 Stage 3 necrotizing enterocolitis

        Inclusion term(s):

        • Necrotizing enterocolitis with perforation
        • Necrotizing enterocolitis with pneumatosis and perforation
    5. K55.8 Other vascular disorders of intestine

    6. K55.9 Vascular disorder of intestine, unspecified

      Inclusion term(s):

      • Ischemic colitis
      • Ischemic enteritis
      • Ischemic enterocolitis
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.