K55.30 Necrotizing enterocolitis, unspecified

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

Applicable to

• Necrotizing enterocolitis, NOS

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 K55.3 Necrotizing enterocolitis

Excludes1 (never code together)

• necrotizing enterocolitis of newborn (P77.-)

Excludes2 (not included here)

• necrotizing enterocolitis due to Clostridium difficile (A04.7-)

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)

Diagnosis Index entries for K55.30

• Enterocolitis › necrotizing
• Enterocolitis › necrotizing › in non-newborn

Nearby codes

• K55.1 Chronic vascular disorders of intestine
• K55.2 Angiodysplasia of colon
• K55.20 Angiodysplasia of colon without hemorrhage
• K55.21 Angiodysplasia of colon with hemorrhage
• K55.3 Necrotizing enterocolitis
• K55.30 Necrotizing enterocolitis, unspecified (this code)
• 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