ICD-10-CM category
G04 Encephalitis, myelitis and encephalomyelitis
G04 is a category, not a billable code. Report one of the 14 complete codes below.
Codes in G04
- G04.00Acute disseminated encephalitis and encephalomyelitis, unspecified
- G04.01Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
- G04.02Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis
- G04.1Tropical spastic paraplegia
- G04.2Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
- G04.30Acute necrotizing hemorrhagic encephalopathy, unspecified
- G04.31Postinfectious acute necrotizing hemorrhagic encephalopathy
- G04.32Postimmunization acute necrotizing hemorrhagic encephalopathy
- G04.39Other acute necrotizing hemorrhagic encephalopathy
- G04.81Other encephalitis and encephalomyelitis
- G04.82Acute flaccid myelitis
- G04.89Other myelitis
- G04.90Encephalitis and encephalomyelitis, unspecified
- G04.91Myelitis, unspecified
Outside the US? G04 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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