ICD-10 Code I77.819 – Aortic ectasia, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I77.819 – Aortic ectasia, unspecified site
What it is
Aortic ectasia means the aorta is mildly enlarged or widened, but not necessarily aneurysmal. “Unspecified site” means the record does not identify the exact aortic segment involved.
Clinical signs
Clinical features vary; refer to documentation. It is often identified on imaging, where the aorta appears enlarged without clear aneurysm criteria or a specific location noted.
When to use this code
Use this code when the provider documents aortic ectasia and does not specify the site. It is appropriate when imaging or assessment confirms ectatic change, but the chart does not identify the ascending, arch, thoracic, or abdominal aorta.
If the note states aneurysm, dissection, or a named aortic segment, check documentation and code the more specific diagnosis instead. Do not assume the site from the imaging report unless the provider documents it.
Do not use for
Do not use this code for aortic aneurysm, aortic dissection, or ectasia with a clearly documented anatomic site. Check documentation when the record is vague or uses non-specific vascular wording.
Coding tip
Query the provider if the report names the aortic segment, because “unspecified site” should be reserved for truly non-specific documentation.