ICD-10 Code I71.012 – Dissection of descending thoracic aorta (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I71.012 – Dissection of descending thoracic aorta
What it is
This code identifies a tear in the inner layer of the descending thoracic aorta, allowing blood to split the vessel wall. It is used when documentation specifies dissection in the descending thoracic segment.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include sudden chest, back, or tearing pain, with imaging confirming a descending thoracic aortic dissection.
When to use this code
Use this code when the provider documents dissection limited to the descending thoracic aorta. It also fits cases confirmed by CTA, MRA, or other imaging that clearly identifies this location. If the record only says “aortic dissection,” check documentation for the exact segment.
Do not use for
Do not use this code for dissections of the ascending aorta, aortic arch, abdominal aorta, or unspecified aortic dissection. Check documentation when the location is unclear.
Coding tip
Match the code to the exact aortic segment named in the report; location drives correct code selection.