ICD-10 Code I77.811 – Abdominal aortic ectasia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I77.811 – Abdominal aortic ectasia
What it is
Abdominal aortic ectasia means the abdominal aorta is mildly enlarged or widened, but not necessarily aneurysmal. Use this code when documentation specifically names ectasia of the abdominal aorta.
Clinical signs
Clinical features vary; refer to documentation. It is often identified on imaging, such as ultrasound or CT, showing a mild diffuse enlargement of the abdominal aorta without clear aneurysm criteria.
When to use this code
Use I77.811 when the provider documents abdominal aortic ectasia as the diagnosis or imaging impression. It may also apply when the record states mild aortic dilatation or ectatic abdominal aorta and no aneurysm is diagnosed.
Code it only when the finding is clinically documented and relevant to the encounter. If the report instead describes an abdominal aortic aneurysm, check documentation and code the aneurysm diagnosis.
Do not use for
Do not use this code for abdominal aortic aneurysm, aortic dissection, or nonspecific aortic disease. If the record does not clearly identify ectasia, check documentation.
Coding tip
Match the code to the exact imaging or provider wording, and do not assume ectasia equals aneurysm.