G04..0 Acute disseminated encephalitis and encephalomyelitis (ADEM)

Non-billable header

Excludes 1 (cannot be coded together)

  • acute necrotizing hemorrhagic encephalopathy (G04.3-)
  • other noninfectious acute disseminated encephalomyelitis (noninfectious ADEM) (G04.81)

Last reviewed: September 2026