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  3. Ch. G00-G99
  4. Sec. G00-G09
  5. Category G04
Category G04

Encephalitis, myelitis and encephalomyelitis

Clinical Classification Guidelines

Specific Diagnosis Codes

Acute disseminated encephalitis and encephalomyelitis (ADEM)
G04.0
Acute disseminated encephalitis and encephalomyelitis, unspecified
G04.00
Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM)
G04.01
Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis
G04.02
Tropical spastic paraplegia
G04.1
Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
G04.2
Acute necrotizing hemorrhagic encephalopathy
G04.3
Acute necrotizing hemorrhagic encephalopathy, unspecified
G04.30
Postinfectious acute necrotizing hemorrhagic encephalopathy
G04.31
Postimmunization acute necrotizing hemorrhagic encephalopathy
G04.32
Other acute necrotizing hemorrhagic encephalopathy
G04.39
Other encephalitis, myelitis and encephalomyelitis
G04.8
Other encephalitis and encephalomyelitis
G04.81
Acute flaccid myelitis
G04.82
Other myelitis
G04.89
Encephalitis, myelitis and encephalomyelitis, unspecified
G04.9
Encephalitis and encephalomyelitis, unspecified
G04.90
Myelitis, unspecified
G04.91
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Data updated for October 2025 release.

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