ICD-10 Code I77.81 – Aortic ectasia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I77.81 – Aortic ectasia
What it is
Aortic ectasia means a mild widening or stretching of the aorta that does not necessarily meet the definition of aneurysm. You should use this code when the record documents ectasia of the aorta.
Clinical signs
Clinical features vary; refer to documentation. It is often found on imaging and may be described as a dilated, enlarged, or mildly tortuous aorta without clear aneurysmal criteria.
When to use this code
Use I77.81 when the provider documents aortic ectasia, including incidental imaging findings. It is appropriate when the chart specifically names ectasia rather than aneurysm, dissection, or other aortic disease. Check documentation if the wording is unclear.
Do not use for
Do not use this code for aortic aneurysm, aortic dissection, or nonspecific aortic dilation without documentation of ectasia. If the report uses another aortic diagnosis, code that condition instead.
Coding tip
Code the exact aortic term documented; if only “dilated aorta” appears, verify whether the provider means ectasia.