ICD-10-CM > G00-G99 > G00-G09 > G04 > G04.3 G04.3 Acute necrotizing hemorrhagic encephalopathy Non-Billable/Non-Specific Type 1 Excludes acute disseminated encephalitis and encephalomyelitis (G04.0-) Codes G04.30Acute necrotizing hemorrhagic encephalopathy, unspecifiedG04.31Postinfectious acute necrotizing hemorrhagic encephalopathyG04.32Postimmunization acute necrotizing hemorrhagic encephalopathyG04.39Other acute necrotizing hemorrhagic encephalopathy