P91.63 Severe hypoxic ischemic encephalopathy [HIE]

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

Applies from P91.6 Hypoxic ischemic encephalopathy [HIE]

Excludes1 (never code together)

• Neonatal cerebral depression (P91.4)
• Neonatal cerebral irritability (P91.3)
• Neonatal coma (P91.5)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 202 — Coma, Brain Compression/Anoxic Damage

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 768.73 Severe hypoxic-ischemic encephalopathy

Code annotations containing back-references to P91.63

Back-references to P91.6

• Type 1 Excludes: P84 Other problems with newborn ("hypoxic ischemic encephalopathy [HIE] (P91.6-)")

Diagnosis Index entries for P91.63

• Encephalopathy (acute) › hypoxic ischemic › severe
• Newborn (infant) (liveborn) (singleton) › affected by › hypoxic ischemic encephalopathy [HIE] › severe

Nearby codes

• P91.5 Neonatal coma
• P91.6 Hypoxic ischemic encephalopathy [HIE]
• P91.60 Hypoxic ischemic encephalopathy [HIE], unspecified
• P91.61 Mild hypoxic ischemic encephalopathy [HIE]
• P91.62 Moderate hypoxic ischemic encephalopathy [HIE]
• P91.63 Severe hypoxic ischemic encephalopathy [HIE] (this code)
• P91.8 Other specified disturbances of cerebral status of newborn
• P91.81 Neonatal encephalopathy
• P91.811 Neonatal encephalopathy in diseases classified elsewhere
• P91.819 Neonatal encephalopathy, unspecified
• P91.82 Neonatal cerebral infarction