Infective myocarditis

This code represents inflammation of the heart muscle (myocardium) caused by an infectious agent. This condition can lead to impaired cardiac function, arrhythmias, and heart failure.

Assign this code when documentation clearly indicates myocarditis resulting from a bacterial, viral, fungal, or parasitic infection. Supporting documentation should specify the infectious etiology, if known, and evidence of myocardial involvement.

• Always code the underlying infectious agent first, if identified and documented.
• Distinguish from non-infective myocarditis (I40.1-I40.9) or other forms of cardiomyopathy.
• Ensure documentation specifies "infective" to differentiate from other causes of myocarditis.