K55 Vascular disorders of intestine

Category / Non-billable header 36 subcodes

Block: Other diseases of intestines (K55-K64)

Excludes 1 (cannot be coded together)

  • necrotizing enterocolitis of newborn (P77.-)

Excludes 2 (not included here)

  • angioectasia (angiodysplasia) duodenum (K31.81-)

Subcodes

Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.

Code Description Billable
K55..0 Acute vascular disorders of intestine No
K55..01 Acute (reversible) ischemia of small intestine No
K55..011 Focal (segmental) acute (reversible) ischemia of small intestine Yes
K55..012 Diffuse acute (reversible) ischemia of small intestine Yes
K55..019 Acute (reversible) ischemia of small intestine, extent unspecified Yes
K55..02 Acute infarction of small intestine No
K55..021 Focal (segmental) acute infarction of small intestine Yes
K55..022 Diffuse acute infarction of small intestine Yes
K55..029 Acute infarction of small intestine, extent unspecified Yes
K55..03 Acute (reversible) ischemia of large intestine No
K55..031 Focal (segmental) acute (reversible) ischemia of large intestine Yes
K55..032 Diffuse acute (reversible) ischemia of large intestine Yes
K55..039 Acute (reversible) ischemia of large intestine, extent unspecified Yes
K55..04 Acute infarction of large intestine No
K55..041 Focal (segmental) acute infarction of large intestine Yes
K55..042 Diffuse acute infarction of large intestine Yes
K55..049 Acute infarction of large intestine, extent unspecified Yes
K55..05 Acute (reversible) ischemia of intestine, part unspecified No
K55..051 Focal (segmental) acute (reversible) ischemia of intestine, part unspecified Yes
K55..052 Diffuse acute (reversible) ischemia of intestine, part unspecified Yes
K55..059 Acute (reversible) ischemia of intestine, part and extent unspecified Yes
K55..06 Acute infarction of intestine, part unspecified No
K55..061 Focal (segmental) acute infarction of intestine, part unspecified Yes
K55..062 Diffuse acute infarction of intestine, part unspecified Yes
K55..069 Acute infarction of intestine, part and extent unspecified Yes
K55..1 Chronic vascular disorders of intestine Yes
K55..2 Angiodysplasia of colon No
K55..20 Angiodysplasia of colon without hemorrhage Yes
K55..21 Angiodysplasia of colon with hemorrhage Yes
K55..3 Necrotizing enterocolitis No
K55..30 Necrotizing enterocolitis, unspecified Yes
K55..31 Stage 1 necrotizing enterocolitis Yes
K55..32 Stage 2 necrotizing enterocolitis Yes
K55..33 Stage 3 necrotizing enterocolitis Yes
K55..8 Other vascular disorders of intestine Yes
K55..9 Vascular disorder of intestine, unspecified Yes

Last reviewed: September 2026