Gammaherpesviral mononucleosis with meningitis

This code signifies an infection caused by a gammaherpesvirus, typically Epstein-Barr virus (EBV), presenting with the characteristic symptoms of infectious mononucleosis and complicated by inflammation of the meninges. This condition involves both systemic manifestations of mononucleosis (e.g., fever, fatigue, lymphadenopathy) and neurological involvement.

Apply this code when documentation confirms a diagnosis of mononucleosis due to a gammaherpesvirus, specifically noting the presence of meningitis. Supporting documentation would include positive serological tests for EBV or other gammaherpesviruses, along with clinical signs and symptoms of both mononucleosis and meningitis (e.g., stiff neck, headache, altered mental status, CSF findings).

• Ensure the documentation explicitly links the meningitis to the gammaherpesviral mononucleosis.
• Do not use this code if the meningitis is due to a different viral etiology or if mononucleosis is not present.
• Consider sequencing this code as the primary diagnosis if it is the main reason for the encounter.