A92.31
BillableWest Nile virus infection with encephalitis
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
West Nile virus infection that has spread to cause inflammation of the brain (encephalitis). This is a serious neurological complication of West Nile virus transmitted through mosquito bites.
Coding Tips
- •Ensure documentation clearly states both the West Nile virus infection AND encephalitis diagnosis before assigning this code; encephalitis must be explicitly documented as a complication
- •Do not use this code for West Nile virus without encephalitis; use A92.30 instead for uncomplicated West Nile virus infection
Code Hierarchy
└A92Other mosquito-borne viral fevers└A92.3West Nile virus infection└A92.31West Nile virus infection with encephalitis
└A92.31West Nile virus infection with encephalitis