ICD-10-CM > G00-G99 > G00-G09 > G04 > G04.0 G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM) Non-Billable/Non-Specific Type 1 Excludes acute necrotizing hemorrhagic encephalopathy (G04.3-)other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81) Codes G04.00Acute disseminated encephalitis and encephalomyelitis, unspecifiedG04.01Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)G04.02Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis