P91.811 Neonatal encephalopathy in diseases classified elsewhere

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Code first

• underlying condition, if known, such as:
• congenital cirrhosis (of liver) (P78.81)
• intracranial nontraumatic hemorrhage of newborn (P52.-)
• kernicterus (P57.-)

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)

• 779.1 Other and unspecified cerebral irritability in newborn (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Diagnosis Index entries for P91.811

• Encephalopathy (acute) › neonatal › in diseases classified elsewhere

Nearby codes

• P91.61 Mild hypoxic ischemic encephalopathy [HIE]
• P91.62 Moderate hypoxic ischemic encephalopathy [HIE]
• P91.63 Severe hypoxic ischemic encephalopathy [HIE]
• P91.8 Other specified disturbances of cerebral status of newborn
• P91.81 Neonatal encephalopathy
• P91.811 Neonatal encephalopathy in diseases classified elsewhere (this code)
• P91.819 Neonatal encephalopathy, unspecified
• P91.82 Neonatal cerebral infarction
• P91.821 Neonatal cerebral infarction, right side of brain
• P91.822 Neonatal cerebral infarction, left side of brain
• P91.823 Neonatal cerebral infarction, bilateral