Other specified viral encephalitis

This code signifies inflammation of the brain caused by a viral infection that is not classified elsewhere. It encompasses various viral encephalitides where the specific viral agent is known but does not have a dedicated ICD-10-CM code, or when the viral etiology is confirmed but not further specified.

Use this code when documentation clearly indicates viral encephalitis and the specific viral pathogen is identified but lacks a more precise code (e.g., West Nile encephalitis, St. Louis encephalitis, California encephalitis). It is also appropriate when the medical record confirms a viral etiology for encephalitis without further specification of the virus type. Supporting documentation includes positive viral serology, CSF analysis, or specific viral PCR results.

• Always attempt to identify the specific viral agent if documented; if a more specific code exists (e.g., for herpesviral encephalitis), use that instead.
• Do not use this code if the encephalitis is bacterial, fungal, parasitic, or due to a non-infectious cause.
• Sequence this code as the primary diagnosis when the encephalitis is the reason for the encounter, followed by codes for any associated neurological manifestations.