G05.3 Encephalitis and encephalomyelitis in diseases classified elsewhere
Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.
Applicable to
Meningoencephalitis in diseases classified elsewhere
Code first
underlying disease
Applies from G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
Excludes1 (never code together)
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)
MS-DRG index
Defines the logic of DRG(s) 023-024 in MDC 01.
Approximate ICD-9-CM (GEMs)
323.41 Other encephalitis and encephalomyelitis due to other infections classified elsewhere (approximate)
Medicare Code Edits (MCE v43.1 (April 2026))
Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.
Code annotations containing back-references to G05.3
Back-references to G05.3
Use Additional: M32.19 Other organ or system involvement in systemic lupus erythematosus ("code(s) to identify organ or system involvement, such as encephalitis (G05.3)")
Back-references to G05
Type 1 Excludes: G01 Meningitis in bacterial diseases classified elsewhere ("meningoencephalitis and meningomyelitis in bacterial diseases classified elsewhere (G05)")
Type 1 Excludes: G02 Meningitis in other infectious and parasitic diseases classified elsewhere ("meningoencephalitis and meningomyelitis in other infectious and parasitic diseases classified elsewhere (G05)")
Diagnosis Index entries for G05.3
Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › due to › human immunodeficiency virus (HIV) disease