A83.3 St Louis encephalitis
Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.
Applies from A83 Mosquito-borne viral encephalitis
Includes
- mosquito-borne viral meningoencephalitis
Excludes2 (not included here)
- Venezuelan equine encephalitis (A92.2)
- West Nile fever (A92.3-)
- West Nile virus (A92.3-)
MS-DRG index
Defines the logic of DRG(s) 023-024 in MDC 01.
Approximate ICD-9-CM (GEMs)
062.3 St. Louis encephalitis
Diagnosis Index entries for A83.3
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › St. Louis
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › type › C
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › viral, virus › arthropod-borne NEC › mosquito-borne › St. Louis
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) › viral, virus › arthropod-borne NEC › mosquito-borne › type C
Nearby codes
A83 Mosquito-borne viral encephalitisA83.0 Japanese encephalitisA83.1 Western equine encephalitisA83.2 Eastern equine encephalitisA83.3 St Louis encephalitis (this code)A83.4 Australian encephalitisA83.5 California encephalitisA83.6 Rocio virus diseaseA83.8 Other mosquito-borne viral encephalitisA83.9 Mosquito-borne viral encephalitis, unspecified