G04.8

Non-Billable
ChapterG00–G99
Ranksubcategory
Official Description

Other encephalitis, myelitis and encephalomyelitis

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).

Instructional Notes

Code Also
General instructions are available for the parent sections:
View CH6 NotesView G04 Notes

Clinical Hierarchy

CH6Diseases of the nervous system (G00-G99)
G00-G09Inflammatory diseases of the central nervous system (G00-G09)
G04Encephalitis, myelitis and encephalomyelitis
G04.8Other encephalitis, myelitis and encephalomyelitis
G04.81Other encephalitis and encephalomyelitis
G04.82Acute flaccid myelitis
G04.89Other myelitis

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G04.8:

categoryG04
Encephalitis, myelitis and encephalomyelitis
View context instructions
chapterCH6
Diseases of the nervous system (G00-G99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to G04.8. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

14 raw paths
Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)4 unique routes
acute
disseminated
noninfectious→G04.8
Rasmussen→G04.8
specified NEC→G04.8
suppurative→G04.8
Encephalomyelitis2 unique routes
acute disseminated
noninfectious→G04.8
specified NEC→G04.8
Infection, infected, infective (opportunistic)1 unique routes
spinal cord NOS
streptococcal→G04.8
Leukoencephalitis1 unique routes
Direct index entry→G04.8
Meningoencephalitis1 unique routes
specified organism NEC→G04.8
Myelitis (acute) (ascending) (childhood) (chronic) (descending) (diffuse) (disseminated) (idiopathic) (pressure) (progressive) (spinal cord) (subacute)3 unique routes
flaccid→G04.8
postinfectious NEC→G04.8
specified NEC→G04.8
Rasmussen encephalitis1 unique routes
Direct index entry→G04.8
Syndrome1 unique routes
Rasmussen→G04.8

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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