ICD-10 Code G04.30 – Acute necrotizing hemorrhagic encephalopathy, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G04.30 – Acute necrotizing hemorrhagic encephalopathy, unspecified
What it is
This code identifies an acute encephalopathic disorder with necrotizing and hemorrhagic brain inflammation, without further specification of cause or site. Use it when the record documents this diagnosis but does not provide more detail.
Clinical signs
Clinical features vary; refer to documentation. Typical encephalopathy findings may include altered mental status, seizures, focal neurologic deficits, or rapid neurologic decline, but you should code only what is documented.
When to use this code
Use G04.30 when the provider clearly documents acute necrotizing hemorrhagic encephalopathy and does not name a more specific subtype. It may also fit discharge summaries, imaging reports, or consult notes that confirm the diagnosis without additional detail. If the record is unclear, check documentation before assigning the code.
Do not use for
Do not use this code for nonspecific encephalitis, hemorrhage alone, or other neurologic conditions that are not documented as necrotizing hemorrhagic encephalopathy. If the chart names a different encephalopathy, code that diagnosis instead.
Coding tip
Assign this code only when the exact diagnosis appears in the record and no more specific code is supported.