K55.021 Focal (segmental) acute infarction of small intestine

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applies from K55 Vascular disorders of intestine

Excludes1 (never code together)

• necrotizing enterocolitis of newborn (P77.-)

Excludes2 (not included here)

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

Applies from K55.0 Acute vascular disorders of intestine

Applicable to

• Infarction of appendices epiploicae
• Mesenteric (artery) (vein) embolism
• Mesenteric (artery) (vein) infarction
• Mesenteric (artery) (vein) thrombosis

Applies from K55.02 Acute infarction of small intestine

Applicable to

• Gangrene of small intestine
• Necrosis of small intestine

Risk adjustment (HCC)

• CMS-HCC V22: HCC 107 — Vascular Disease with Complications
• ESRD V24: HCC 107

MS-DRG index

Defines the logic of DRG(s) 393-395 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 557.0 Acute vascular insufficiency of intestine (approximate)

Code annotations containing back-references to K55.021

Back-references to K55.0

• Type 2 Excludes: I74 Arterial embolism and thrombosis ("mesenteric embolism and thrombosis (K55.0-)")
• Type 2 Excludes: I82 Other venous embolism and thrombosis ("mesenteric (K55.0-)")

Diagnosis Index entries for K55.021

• Infarct, infarction › intestine (acute) (agnogenic) (embolic) (hemorrhagic) (nonocclusive) (nonthrombotic) (occlusive) (thrombotic) (with gangrene) › small › focal

Nearby codes

• 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
• K55.02 Acute infarction of small intestine
• K55.021 Focal (segmental) acute infarction of small intestine (this code)
• K55.022 Diffuse acute infarction of small intestine
• K55.029 Acute infarction of small intestine, extent unspecified
• K55.03 Acute (reversible) ischemia of large intestine
• K55.031 Focal (segmental) acute (reversible) ischemia of large intestine
• K55.032 Diffuse acute (reversible) ischemia of large intestine