Class ICD-10 code Class A1 R96: other sudden death, cause unknown I49.9: cardiac arrhythmia, unspecified I46.1: sudden cardiac death, so described I45.6: pre-excitation syndrome (WPW) Class A2 I21.9: acute myocardial infarction, unspecified I25.1: atherosclerotic heart disease I42.0: dilated cardiomyopathy I42.9: cardiomyopathy, unspecified Class A3 I50.9: ...