ICD-10 Code I51.7 – Cardiomegaly (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I51.7 – Cardiomegaly
What it is
Cardiomegaly means an enlarged heart seen on imaging or noted in documentation. It describes the finding, not the underlying cause.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the record may note an enlarged cardiac silhouette on chest imaging or other evidence of heart enlargement.
When to use this code
Use I51.7 when the provider documents cardiomegaly or heart enlargement without a more specific diagnosis. It may apply when imaging confirms enlargement and the cause is not stated. Code the underlying condition separately if it is documented.
Do not use for
Do not use this code if the chart identifies a specific heart disease causing the enlargement, such as cardiomyopathy or hypertensive heart disease. Check documentation if the enlargement is only suspected.
Coding tip
Assign I51.7 only when cardiomegaly is clearly documented as a diagnosis or confirmed finding, and look for a more specific cause first.