1. G04 Encephalitis, myelitis and encephalomyelitis

    Includes:

    • acute ascending myelitis
    • meningoencephalitis
    • meningomyelitis

    Excludes1

    Excludes2

    • acute transverse myelitis (G37.3-)
    • alcoholic encephalopathy (G31.2)
    • benign myalgic encephalomyelitis (G93.3)
    • multiple sclerosis (G35)
    • subacute necrotizing myelitis (G37.4)
    • toxic encephalitis (G92)
    • toxic encephalopathy (G92)
    1. G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM)

      1. G04.00 Acute disseminated encephalitis and encephalomyelitis, unspecified

      2. G04.01 Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)

      3. G04.02 Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis

        Inclusion term(s):

        • Encephalitis, post immunization
        • Encephalomyelitis, post immunization
    2. G04.1 Tropical spastic paraplegia

    3. G04.2 Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified

    4. G04.3 Acute necrotizing hemorrhagic encephalopathy

      1. G04.30 Acute necrotizing hemorrhagic encephalopathy, unspecified

      2. G04.31 Postinfectious acute necrotizing hemorrhagic encephalopathy

      3. G04.32 Postimmunization acute necrotizing hemorrhagic encephalopathy

      4. G04.39 Other acute necrotizing hemorrhagic encephalopathy

    5. G04.8 Other encephalitis, myelitis and encephalomyelitis

      1. G04.81 Other encephalitis and encephalomyelitis

        Inclusion term(s):

        • Noninfectious acute disseminated encephalomyelitis (noninfectious ADEM)
      2. G04.89 Other myelitis

    6. G04.9 Encephalitis, myelitis and encephalomyelitis, unspecified

      1. G04.90 Encephalitis and encephalomyelitis, unspecified

        Inclusion term(s):

        • Ventriculitis (cerebral) NOS
      2. G04.91 Myelitis, unspecified

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.