ICD-10 Code I71 – Aortic aneurysm and dissection (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I71 – Aortic aneurysm and dissection
What it is
I71 covers diseases of the aorta involving aneurysm, dissection, or both. Use it when documentation identifies dilation, tearing, or a combined aneurysmal and dissecting process of the aorta.
Clinical signs
Clinical features vary; refer to documentation. Common findings include chest, back, or abdominal pain, pulse deficits, or imaging evidence of aortic enlargement or dissection.
When to use this code
Use I71 when the provider documents an aortic aneurysm, aortic dissection, or both, and no more specific subcategory is given. It may also apply when imaging or operative notes confirm the diagnosis. Check whether the record specifies thoracic, abdominal, or ruptured disease before assigning the final code.
Do not use for
Do not use I71 for aneurysms of non-aortic vessels, such as cerebral or peripheral arteries. If the chart only states aortic ectasia, dilation, or suspected disease without confirmation, check documentation.
Coding tip
Always code the most specific aortic site and rupture status documented, not just the umbrella category.