G04Encephalitis, myelitis and encephalomyelitis
ICD-10-CM category (non-billable header) code — part of Inflammatory diseases of the central nervous system (G00-G09)
Coding Notes
Includes
- acute ascending myelitis
- meningoencephalitis
- meningomyelitis
Excludes1 (never code both together)
- encephalopathy NOS (G93.40)
Excludes2 (not part of this condition — may code both)
- acute transverse myelitis (G37.3)
- alcoholic encephalopathy (G31.2)
- multiple sclerosis (G35-)
- myalgic encephalomyelitis (G93.32)
- subacute necrotizing myelitis (G37.4)
- toxic encephalitis (G92.8)
- toxic encephalopathy (G92.8)
Subcategories (6)
- G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM)
- G04.1 Tropical spastic paraplegia
- G04.2 Bacterial meningoencephalitis and meningomyelitis, NEC
- G04.3 Acute necrotizing hemorrhagic encephalopathy
- G04.8 Other encephalitis, myelitis and encephalomyelitis
- G04.9 Encephalitis, myelitis and encephalomyelitis, unspecified