Mumps myocarditis

This code identifies inflammation of the heart muscle (myocarditis) specifically caused by a mumps virus infection. It represents a rare but serious complication of the mumps disease, affecting the myocardium.

Assign this code when documentation clearly indicates myocarditis as a direct sequela of a mumps infection. Supporting documentation would include a confirmed mumps diagnosis (e.g., positive serology or viral culture) and clinical findings consistent with myocarditis (e.g., elevated cardiac enzymes, EKG changes, echocardiographic abnormalities).

• Always ensure a definitive link between the mumps infection and the myocarditis is documented.
• Do not use this code for myocarditis due to other viral etiologies; specific codes exist for those.
• Sequence this code as a secondary diagnosis if the primary reason for the encounter is the mumps infection itself, or as a primary diagnosis if the myocarditis is the focus of treatment.