Unspecified non-arthropod-borne viral diseases of central nervous system

This code signifies a viral infection affecting the central nervous system (CNS) where the specific type of virus is unknown, and it is not transmitted by arthropods (e.g., mosquitoes, ticks). It encompasses conditions like viral meningitis or encephalitis when the causative agent has not been identified.

This code is appropriate when a patient presents with symptoms of a viral CNS infection (e.g., fever, headache, stiff neck, altered mental status) and diagnostic testing has not yet isolated a specific non-arthropod-borne viral pathogen. Documentation should clearly indicate a viral etiology and the CNS involvement, without further specificity of the virus.

• Only use this code when the viral agent is truly unspecified and not arthropod-borne.
• Avoid using this code if a more specific viral CNS infection code is available (e.g., enteroviral meningitis).
• Always review the medical record for any subsequent lab results that might identify the specific virus, allowing for a more precise code.