Inflammatory diseases of the central nervous system (G00-G09)
G04: Encephalitis, myelitis and encephalomyelitis

includes
acute ascending myelitis
meningoencephalitis
meningomyelitis

excludes1
encephalopathy NOS (G93.40)

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 (G92.8)
toxic encephalopathy (G92.8)
G04.0: Acute disseminated encephalitis and encephalomyelitis (ADEM)
G04.1: Tropical spastic paraplegia
G04.2: Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
G04.3: Acute necrotizing hemorrhagic encephalopathy
G04.8: Other encephalitis, myelitis and encephalomyelitis
G04.9: Encephalitis, myelitis and encephalomyelitis, unspecified

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