I51.7 Cardiomegaly
The ICD-10-CM code for Cardiomegaly is I51.7 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- I30-I5A: Other forms of heart disease (I30-I5A)
- Category I51
- 12 codes (10 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to I51.7:
- Preponderance, left or right ventricular
- Cardiomegaly › idiopathic
- Athlete's › heart
- Hypertrophy, hypertrophic › cardiac (chronic) (idiopathic)
Inclusion Terms
- Cardiac dilatation
- Cardiac hypertrophy
- Ventricular dilatation
U.S. Hospital Utilization
- An estimated 55,145 U.S. inpatient stays in 2023 included I51.7 among the documented diagnoses.
- 130 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
I11 for I51.5/I51.7; no additional code for specific heart conditionHypertension with heart conditions classified to I51.5, Myocardial degeneration, or I51.7, Cardiomegaly, is assigned to a code from category I11, Hypertensive heart disease. No additional code is assigned to identify the specific heart condition.
Code separately if documented unrelated; assign I10 or I15; sequence per encounterThe same heart conditions (I50.-, I51.4-I51.7, I51.89, I51.9) with hypertension are coded separately if the provider has documented they are unrelated to the hypertension. The applicable hypertension code I10, Essential (primary) hypertension, or a code from category I15, Secondary hypertension, should be assigned. Sequence according to the circumstances of the admission/encounter.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026