What is medical code J7120?

J71.20 _Infectious mononucleosis, unspecified_

This code refers to infectious mononucleosis caused by Epstein-Barr Virus without further specification. Infectious mononucleosis is an acute infectious disease primarily involving the lymphoid system, especially the lymph nodes, and is most common among adolescents and young adults. It is typically characterized by fever, sore throat, swollen lymph nodes, fatigue, rash, and atypical lymphocytosis.