G04.9
Non-Billable
ChapterG00–G99
Ranksubcategory
Official Description
Encephalitis, myelitis and encephalomyelitis, unspecified
Metadata & Insights
- •2026 ICD-10-CM Edition - Effective October 1, 2025.
- •Non-billable category (requires more specific sub-code).
- •Chapter 6: Diseases of the Nervous System (G00-G99).
General instructions are available for the parent sections:
Clinical Hierarchy
CH6Diseases of the nervous system (G00-G99)
G00-G09Inflammatory diseases of the central nervous system (G00-G09)
G04Encephalitis, myelitis and encephalomyelitis
G04.9Encephalitis, myelitis and encephalomyelitis, unspecified
G04.90Encephalitis and encephalomyelitis, unspecified
G04.91Myelitis, unspecified
Applicable Ancestor Context
The following parent sections contain instructions or notes that apply to G04.9:
Alphabetic Index Mentions
These are Diagnosis Index lookup paths that route to G04.9. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.
9 raw paths
Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)1 unique routes
Encephalomyelitis1 unique routes
Hematomyelitis1 unique routes
Meningoencephalitis1 unique routes
Myeloradiculitis1 unique routes
Ventriculitis (cerebral)1 unique routes
MS-DRG Classification
No direct MS-DRG triggers identified.
Cross Reference
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