ICD-10 Code I71.010 – Dissection of ascending aorta (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I71.010 – Dissection of ascending aorta
What it is
I71.010 identifies a dissection involving the ascending aorta, where a tear in the aortic wall allows blood to split the layers of the vessel. Use this code when documentation specifies the ascending segment.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include sudden severe chest or back pain, pulse deficits, syncope, or signs of acute aortic insufficiency.
When to use this code
Use I71.010 when the provider documents dissection of the ascending aorta, whether acute or chronic status is not separately specified in the record. It is appropriate for confirmed imaging, operative, or discharge documentation naming the ascending aorta. If the record only says “aortic dissection” without location, check documentation.
Do not use for
Do not use this code for dissection limited to other aortic segments, such as descending or thoracoabdominal areas. Do not assign it when the documentation only indicates aneurysm, intramural hematoma, or suspected dissection without confirmation.
Coding tip
Code the exact aortic location documented; if the ascending aorta is not clearly named, query the provider before assigning I71.010.