P77.1 Stage 1 necrotizing enterocolitis in newborn

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

Applicable to

• Necrotizing enterocolitis without pneumatosis, without perforation

Risk adjustment (HCC)

• CMS-HCC V28: HCC 78 — Intestinal Obstruction/Perforation

MS-DRG index

Defines the logic of DRG(s) 791 in MDC 15.

Approximate ICD-9-CM (GEMs)

• 777.51 Stage I necrotizing enterocolitis in newborn

Code annotations containing back-references to P77.1

Back-references to P77

• Type 1 Excludes: K55 Vascular disorders of intestine ("necrotizing enterocolitis of newborn (P77.-)")
• Type 1 Excludes: K55.3 Necrotizing enterocolitis ("necrotizing enterocolitis of newborn (P77.-)")
• Type 2 Excludes: P37 Other congenital infectious and parasitic diseases ("necrotizing enterocolitis in newborn (P77.-)")

Diagnosis Index entries for P77.1

• Enterocolitis › necrotizing › in newborn › stage 1 (without pneumatosis, without perforation)

Nearby codes

• P77 Necrotizing enterocolitis of newborn
• P77.1 Stage 1 necrotizing enterocolitis in newborn (this code)
• P77.2 Stage 2 necrotizing enterocolitis in newborn
• P77.3 Stage 3 necrotizing enterocolitis in newborn
• P77.9 Necrotizing enterocolitis in newborn, unspecified