G04 Encephalitis, myelitis and encephalomyelitis
ICD-10-CM category G04 sits in Chapter 6 (Diseases of the nervous system, G00-G99). It contains 14 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.
Subcategories
G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM)G04.3 Acute necrotizing hemorrhagic encephalopathyG04.8 Other encephalitis, myelitis and encephalomyelitisG04.9 Encephalitis, myelitis and encephalomyelitis, unspecified
Billable codes in G04
| Code | Description |
|---|---|
G04.00 | Acute disseminated encephalitis and encephalomyelitis, unspecified |
G04.01 | Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) |
G04.02 | Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis |
G04.1 | Tropical spastic paraplegia |
G04.2 | Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified |
G04.30 | Acute necrotizing hemorrhagic encephalopathy, unspecified |
G04.31 | Postinfectious acute necrotizing hemorrhagic encephalopathy |
G04.32 | Postimmunization acute necrotizing hemorrhagic encephalopathy |
G04.39 | Other acute necrotizing hemorrhagic encephalopathy |
G04.81 | Other encephalitis and encephalomyelitis |
G04.82 | Acute flaccid myelitis |
G04.89 | Other myelitis |
G04.90 | Encephalitis and encephalomyelitis, unspecified |
G04.91 | Myelitis, unspecified |
Search within ICD-10-CM for G04 and related codes
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