ICD-10 Code I71.00 – Dissection of unspecified site of aorta (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I71.00 – Dissection of unspecified site of aorta
What it is
This code identifies an aortic dissection when the documentation does not specify the exact aortic segment involved. It means a tear in the aortic wall has allowed blood to split the layers of the vessel.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include sudden severe chest, back, or abdominal pain, pulse or blood pressure differences, and signs of reduced blood flow to organs.
When to use this code
Use I71.00 when the provider documents aortic dissection but does not identify whether the ascending, descending, thoracic, abdominal, or other site is involved. You may also use it when the record clearly states “unspecified site” or equivalent wording. If the site is documented elsewhere, code to the more specific option.
Do not use for
Do not use this code for aortic aneurysm without dissection, or for a dissection with a documented specific aortic site. Check documentation if the record is unclear.
Coding tip
Query for the exact aortic location whenever possible, because site specificity may change the final code selection.