K55.9 Vascular disorder of intestine, unspecified

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

Applicable to

• Ischemic colitis
• Ischemic enteritis
• Ischemic enterocolitis

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-)

Risk adjustment (HCC)

• CMS-HCC V22: HCC 108 — Vascular Disease
• ESRD V24: HCC 108

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 557.9 Unspecified vascular insufficiency of intestine (approximate)

Diagnosis Index entries for K55.9

• Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) › ischemic
• Disorder (of) › intestine, intestinal › vascular
• Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) › ischemic
• Enterocolitis › ischemic
• Insufficiency, insufficient › vascular › intestine
• Ischemia, ischemic › intestine (large) (small) (transient)
• Syndrome › ischemic › bowel (transient)

Nearby codes

• 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 (this code)