ICD-10 Code I71.011 – Dissection of aortic arch (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I71.011 – Dissection of aortic arch
What it is
I71.011 identifies a dissection limited to the aortic arch. This means blood has entered the aortic wall and created a tear in the arch segment of the aorta.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include sudden severe chest, back, or neck pain, pulse differences, or imaging evidence showing an arch dissection.
When to use this code
Use this code when the provider documents dissection of the aortic arch specifically, or when imaging clearly localizes the dissection to that segment. You may also use it when the record states aortic arch dissection without a more specific anatomic site.
Check documentation if the dissection extends into the ascending or descending aorta, because a more specific code may apply. Make sure the diagnosis is not simply aneurysm, atherosclerosis, or another aortic disorder.
Do not use for
Do not use this code for thoracic aortic aneurysm, aortic rupture, or aortic dissection in another aortic segment. If the location is unclear, check documentation before assigning I71.011.
Coding tip
Code the exact aortic segment documented; arch-specific localization matters and may change the ICD-10 selection.