ICD-10-CM · Chapter 9 · I00-I99
I51 Complications and ill-defined descriptions of heart disease
Excludes 2 (not included here)
- heart disease specified as rheumatic (I00-I09)
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| I51..0 | Cardiac septal defect, acquired | Yes |
| I51..1 | Rupture of chordae tendineae, not elsewhere classified | Yes |
| I51..2 | Rupture of papillary muscle, not elsewhere classified | Yes |
| I51..3 | Intracardiac thrombosis, not elsewhere classified | Yes |
| I51..4 | Myocarditis, unspecified | Yes |
| I51..5 | Myocardial degeneration | Yes |
| I51..7 | Cardiomegaly | Yes |
| I51..8 | Other ill-defined heart diseases | No |
| I51..81 | Takotsubo syndrome | Yes |
| I51..89 | Other ill-defined heart diseases | Yes |
| I51..9 | Heart disease, unspecified | Yes |
Last reviewed: September 2026