Gammaherpesviral mononucleosis with polyneuropathy

This code signifies an infection caused by gammaherpesviruses, typically Epstein-Barr virus (EBV), manifesting as mononucleosis, and complicated by the development of polyneuropathy. Polyneuropathy involves widespread damage to peripheral nerves, leading to symptoms such as weakness, numbness, and pain in multiple areas of the body. This neurological complication is a direct sequela of the viral infection.

Use this code when documentation clearly indicates a diagnosis of mononucleosis confirmed to be of gammaherpesviral origin (e.g., EBV) and the patient is also diagnosed with polyneuropathy directly attributed to this infection. Supporting documentation should include laboratory confirmation of EBV or other gammaherpesvirus, and clinical findings consistent with both mononucleosis and polyneuropathy.

• Ensure the documentation explicitly links the polyneuropathy to the gammaherpesviral mononucleosis.
• Do not use this code if the mononucleosis is due to a different viral etiology or if the polyneuropathy has an unrelated cause.
• Consider sequencing this code as the primary diagnosis if the mononucleosis with polyneuropathy is the primary reason for the encounter.