ICD-10 Code I52 – Other heart disorders in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I52 – Other heart disorders in diseases classified elsewhere
What it is
I52 is used for heart disorders that are caused by another underlying disease, but do not fit a more specific code. It tells you the cardiac condition is secondary to another classified illness.
Clinical signs
Clinical features vary; refer to documentation. You may see evidence of cardiac involvement linked to a documented systemic or underlying disease, rather than a primary heart disorder.
When to use this code
Use I52 when the record identifies a heart disorder due to another disease and no more specific code is available. Confirm the underlying condition is documented and coded first when required. If the provider names a specific cardiac diagnosis, use that more specific code instead.
Do not use for
Do not use I52 for primary heart diseases, or when a more specific secondary heart code is documented. Check documentation if the cause or exact cardiac disorder is unclear.
Coding tip
Code the underlying disease first, then verify whether I52 is the best residual heart code.