ICD-10 Code I25.3 – Aneurysm of heart (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I25.3 – Aneurysm of heart
What it is
I25.3 identifies an aneurysm of the heart, meaning a localized bulging or thinning of heart muscle or wall tissue. You use it when the record specifically documents this cardiac aneurysm diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Common references describe an abnormal cardiac contour or imaging evidence of a ventricular wall outpouching, often after prior myocardial injury.
When to use this code
Use this code when the provider documents an aneurysm of the heart, including a ventricular aneurysm, and no more specific ICD-10-CM code is assigned. It is appropriate when imaging, operative findings, or cardiology notes clearly support the diagnosis. Check documentation if the record only mentions old infarction, scar, or dyskinesia without aneurysm.
Do not use for
Do not use I25.3 for aneurysms in other vessels or for nonspecific chest pain. If the chart does not clearly state a cardiac aneurysm, check documentation before coding.
Coding tip
Confirm the word “aneurysm” appears in the provider’s assessment or diagnostic report before assigning I25.3.