ICD-10 Code I71.0 – Dissection of aorta (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I71.0 – Dissection of aorta
What it is
I71.0 identifies a tear in the aortic wall that allows blood to split the vessel layers. Use it when documentation states aortic dissection or a dissecting aneurysm of the aorta.
Clinical signs
Clinical features vary; refer to documentation. Common findings include sudden severe chest, back, or abdominal pain, and imaging may show an intimal flap or false lumen in the aorta.
When to use this code
Use I71.0 when the record clearly documents dissection of the aorta, whether acute, chronic, or unspecified. It may also apply when a provider describes a dissecting aneurysm involving the aorta. Check the note for site-specific detail and any associated complications.
Do not use for
Do not use this code for thoracic or abdominal aortic aneurysm without dissection. If the documentation is unclear or refers only to suspected dissection, check documentation before coding.
Coding tip
Verify the exact aortic segment and any associated aneurysm or rupture before assigning I71.0.