| I422 | Other hypertrophic cardiomyopathy |
| I423 | Endomyocardial (eosinophilic) disease |
| I424 | Endocardial fibroelastosis |
| I425 | Other restrictive cardiomyopathy |
| I426 | Alcoholic cardiomyopathy |
| I427 | Cardiomyopathy due to drug and external agent |
| I428 | Other cardiomyopathies |
| I429 | Cardiomyopathy, unspecified |
| I43 | Cardiomyopathy in diseases classified elsewhere |
| I44 | Atrioventricular and left bundle-branch block |
| I440 | Atrioventricular block, first degree |
| I441 | Atrioventricular block, second degree |
| I442 | Atrioventricular block, complete |
| I443 | Other and unspecified atrioventricular block |
| I4430 | Unspecified atrioventricular block |
| I4439 | Other atrioventricular block |
| I444 | Left anterior fascicular block |
| I445 | Left posterior fascicular block |
| I446 | Other and unspecified fascicular block |
| I4460 | Unspecified fascicular block |
| I4469 | Other fascicular block |
| I447 | Left bundle-branch block, unspecified |
| I45 | Other conduction disorders |
| I450 | Right fascicular block |
| I451 | Other and unspecified right bundle-branch block |
| I4510 | Unspecified right bundle-branch block |
| I4519 | Other right bundle-branch block |
| I452 | Bifascicular block |
| I453 | Trifascicular block |
| I454 | Nonspecific intraventricular block |
| I455 | Other specified heart block |
| I456 | Pre-excitation syndrome |
| I458 | Other specified conduction disorders |
| I4581 | Long QT syndrome |
| I4589 | Other specified conduction disorders |
| I459 | Conduction disorder, unspecified |
| I46 | Cardiac arrest |
| I462 | Cardiac arrest due to underlying cardiac condition |
| I468 | Cardiac arrest due to other underlying condition |
| I469 | Cardiac arrest, cause unspecified |
| I47 | Paroxysmal tachycardia |
| I470 | Re-entry ventricular arrhythmia |
| I471 | Supraventricular tachycardia |
| I4710 | Supraventricular tachycardia, unspecified |
| I4711 | Inappropriate sinus tachycardia, so stated |
| I4719 | Other supraventricular tachycardia |
| I472 | Ventricular tachycardia |
| I4720 | Ventricular tachycardia, unspecified |
| I4721 | Torsades de pointes |
| I4729 | Other ventricular tachycardia |