ICD-10 Code I25.4 – Coronary artery aneurysm and dissection (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I25.4 – Coronary artery aneurysm and dissection
What it is
This code identifies a disease of the coronary arteries with abnormal widening (aneurysm) or a tear within the artery wall (dissection). It indicates a structural coronary abnormality that can affect blood flow to the heart.
Clinical signs
Clinical features vary; refer to documentation. Patients may present with chest pain, myocardial ischemia, or findings on coronary imaging showing aneurysmal dilation or dissection.
When to use this code
Use I25.4 when the provider documents coronary artery aneurysm or coronary artery dissection as the diagnosed condition. Apply it for confirmed imaging, angiography, or operative findings when the coronary abnormality is the focus of care.
If the record only suggests possible coronary disease without confirmation, check documentation before coding. Use the code only when the coronary lesion is clearly identified and documented by the treating clinician.
Do not use for
Do not use this code for aneurysms or dissections in non-coronary vessels. Do not assign it for nonspecific chest pain or suspected coronary disease without documented aneurysm or dissection.
Coding tip
Verify whether the provider documented aneurysm, dissection, or both, and code only what is explicitly stated.