ICD-10 Code G04.3 – Acute necrotizing hemorrhagic encephalopathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G04.3 – Acute necrotizing hemorrhagic encephalopathy
What it is
This code identifies acute necrotizing hemorrhagic encephalopathy, a severe inflammatory brain disorder with tissue injury and bleeding. Use it when documentation specifically names this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Standard references describe acute encephalopathic symptoms with neurologic dysfunction, and imaging or pathology may show necrosis and hemorrhage.
When to use this code
Use G04.3 when the provider documents acute necrotizing hemorrhagic encephalopathy as the confirmed diagnosis. Apply it from inpatient, outpatient, or consult notes when the condition is explicitly stated. If the record only says encephalopathy without this specific type, check documentation.
Do not use for
Do not use this code for nonspecific encephalopathy, meningitis, or other inflammatory brain disorders unless the provider clearly documents this condition. If the chart is unclear, check documentation.
Coding tip
Code the exact documented diagnosis, and query the provider if hemorrhagic necrotizing encephalopathy is suspected but not stated.