ICD-10 Code I71.20 – Thoracic aortic aneurysm, without rupture, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I71.20 – Thoracic aortic aneurysm, without rupture, unspecified
What it is
This code identifies a thoracic aortic aneurysm located in the chest portion of the aorta, with no documented rupture and no more specific site given. Use it when the record confirms an aneurysm but does not specify the exact thoracic segment.
Clinical signs
Clinical features vary; refer to documentation. Many cases are found on imaging, while others may be associated with chest or back pain, a pulsatile mass, or symptoms from compression of nearby structures.
When to use this code
Use this code when the provider documents a thoracic aortic aneurysm without rupture and does not name the ascending, arch, or descending portion. It also fits when imaging or the assessment states “thoracic aortic aneurysm” only. If rupture, dissection, or a more specific thoracic location is documented, choose the more precise code.
Do not use for
Do not use this code for ruptured aneurysm, aortic dissection, or aneurysm limited to the abdominal aorta. Check documentation if the provider specifies a more exact thoracic segment.
Coding tip
Code to the most specific thoracic aortic location documented; use I71.20 only when the site is unspecified.