G04 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Encephalitis, myelitis and encephalomyelitis.
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Acute ascending myelitis
Meningoencephalitis
Meningomyelitis
Encephalopathy NOS (G93.40)
Acute disseminated encephalitis and encephalomyelitis (ADEM)
Tropical spastic paraplegia
Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
Acute necrotizing hemorrhagic encephalopathy
Other encephalitis, myelitis and encephalomyelitis
Encephalitis, myelitis and encephalomyelitis, unspecified
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