Unspecified viral infection of central nervous system

This code signifies a viral infection affecting the brain, spinal cord, or meninges, where the specific viral pathogen has not been identified. It indicates a confirmed viral etiology for central nervous system (CNS) inflammation or dysfunction without further microbiological specificity.

Utilize this code when documentation clearly states a viral CNS infection, but laboratory tests or clinical findings do not specify the exact virus (e.g., "viral meningitis, unspecified," "viral encephalitis, etiology unknown"). This code is appropriate when the provider has ruled out bacterial, fungal, or parasitic causes, confirming a viral origin.

• Avoid using this code if a more specific viral pathogen is identified (e.g., enterovirus, herpes simplex virus); instead, code to the specific viral etiology.
• Always review documentation for any signs or symptoms that might point to a more specific diagnosis, even if the virus itself isn't identified.
• This code should be sequenced as the primary diagnosis when the unspecified viral CNS infection is the reason for the encounter.