Cytomegaloviral mononucleosis with meningitis

This code identifies an active infection caused by the cytomegalovirus (CMV) that manifests as mononucleosis, specifically complicated by inflammation of the meninges. It describes a systemic viral illness with neurological involvement.

Assign this code when documentation confirms a diagnosis of CMV mononucleosis with an associated meningitis. This typically requires laboratory confirmation of CMV infection and clinical signs/symptoms consistent with both mononucleosis and meningeal irritation, often supported by cerebrospinal fluid (CSF) analysis.

• Ensure documentation explicitly states "meningitis" in conjunction with CMV mononucleosis, not just general neurological symptoms.
• Do not confuse with other forms of CMV infection without mononucleosis or meningitis, or with mononucleosis due to Epstein-Barr virus.
• Consider additional codes for specific neurological manifestations if documented beyond general meningitis.