| I51 | Complications and ill-defined descriptions of heart disease | NON-BILLABLE CODE |
| I51.0 | Cardiac septal defect, acquired | BILLABLE CODE |
| I51.1 | Rupture of chordae tendineae, not elsewhere classified | BILLABLE CODE |
| I51.3 | Intracardiac thrombosis, not elsewhere classified | BILLABLE CODE |
| I51.4 | Myocarditis, unspecified | BILLABLE CODE |
| I51.5 | Myocardial degeneration | BILLABLE CODE |
| I51.7 | Cardiomegaly | BILLABLE CODE |
| I51.8 | Other ill-defined heart diseases | NON-BILLABLE CODE |
| I51.81 | Takotsubo syndrome | BILLABLE CODE |
| I51.89 | Other ill-defined heart diseases | BILLABLE CODE |
| I51.9 | Heart disease, unspecified | BILLABLE CODE |
