G04
Encephalitis, myelitis and encephalomyelitis
- Release
- FY 2027
- Effective
Official Coding Notes
Reproduced verbatim from the FY 2027 ICD-10-CM files.
Includes
acute ascending myelitis
Includes
meningoencephalitis
Includes
meningomyelitis
Excludes1
encephalopathy NOS ( G93.40 )
Excludes2
acute transverse myelitis ( G37.3 )
Excludes2
alcoholic encephalopathy ( G31.2 )
Excludes2
multiple sclerosis ( G35- )
Excludes2
myalgic encephalomyelitis ( G93.32 )
Excludes2
subacute necrotizing myelitis ( G37.4 )
Excludes2
toxic encephalitis ( G92.8 )
Excludes2
toxic encephalopathy ( G92.8 )
More Specific Codes
6 codes under G04
- G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM) Has subcodes
- G04.1 Tropical spastic paraplegia Billable
- G04.2 Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified Billable
- G04.3 Acute necrotizing hemorrhagic encephalopathy Has subcodes
- G04.8 Other encephalitis, myelitis and encephalomyelitis Has subcodes
- G04.9 Encephalitis, myelitis and encephalomyelitis, unspecified Has subcodes
Version History
How G04 appears in each release imported from the official files, newest first.
-
FY 2027 Effective
CurrentEncephalitis, myelitis and encephalomyelitis
-
FY 2026 Effective
UnchangedEncephalitis, myelitis and encephalomyelitis
Related Codes
Codes whose official notes reference G04
Data Source
Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.
- Release
- FY 2027
- Effective
- Source file
- icd10cm-code-descriptions-2027.zip
Official ICD-10-CM source files (opens in a new tab)
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