The ICD-10-CM code for Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere is
G05 (FY2026).
It is a non-billable category code — select a more specific code below for claims.
Classification
Section
G00-G09: Inflammatory diseases of the central nervous system (G00-G09)
Category G05
3 codes (2 billable)
FY2026 Status
Stable since FY2024
Excludes1
Not coded here. These conditions should NOT be coded together with G05.
adenoviral encephalitis, myelitis and encephalomyelitis (A85.1)
encephalitis, myelitis and encephalomyelitis (in) measles (B05.0)
enteroviral encephalitis, myelitis and encephalomyelitis (A85.0)
herpesviral [herpes simplex] encephalitis, myelitis and encephalomyelitis (B00.4)
listerial encephalitis, myelitis and encephalomyelitis (A32.12)
meningococcal encephalitis, myelitis and encephalomyelitis (A39.81)
mumps encephalitis, myelitis and encephalomyelitis (B26.2)
postchickenpox encephalitis, myelitis and encephalomyelitis (B01.1-)
rubella encephalitis, myelitis and encephalomyelitis (B06.01)
toxoplasmosis encephalitis, myelitis and encephalomyelitis (B58.2)
zoster encephalitis, myelitis and encephalomyelitis (B02.0)
Code First
underlying disease, such as:
congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (P37.1)
cytomegaloviral encephalitis, myelitis and encephalomyelitis (B25.8)
encephalitis, myelitis and encephalomyelitis (in) systemic lupus erythematosus (M32.19)
eosinophilic meningoencephalitis (B83.2)
human immunodeficiency virus [HIV] disease (B20)
poliovirus (A80.-)
suppurative otitis media (H66.01-H66.4)
systemic lupus erythematosus (M32.19)
trichinellosis (B75)
Official Coding Guidelines
Dominant/nondominant side (TOC entry)
a. Dominant/nondominant side ................................................................................................. 45
— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.a
Pain - Category G89 (TOC entry)
b. Pain - Category G89.............................................................................................................. 45
— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.b
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026