ICD-10-CM > I00-I99 > I30-I5A > I40 I40 Acute myocarditis Non-Billable/Non-Specific Includes subacute myocarditis Type 1 Excludes acute rheumatic myocarditis (I01.2) Codes I40.0Infective myocarditisI40.1Isolated myocarditisI40.8Other acute myocarditisI40.9Acute myocarditis, unspecified