ICD-10 Code I79.0 – Aneurysm of aorta in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I79.0 – Aneurysm of aorta in diseases classified elsewhere
What it is
I79.0 identifies an aortic aneurysm that is caused by another underlying disease, rather than a primary aortic disorder. Use it when the record links the aneurysm to a separate condition.
Clinical signs
Clinical features vary; refer to documentation. Patients may have imaging evidence of a dilated or widened aorta, with findings that support aneurysm and an associated underlying disease.
When to use this code
Use I79.0 when the provider documents an aortic aneurysm secondary to another disease, such as a systemic or vascular condition. The chart should clearly show the causal relationship. If the cause is not stated, check documentation before assigning this code.
Do not use for
Do not use this code for a primary aortic aneurysm without an underlying disease connection. Do not use it when the record only says “aortic dilation” or when documentation is insufficient.
Coding tip
Verify the linked underlying disease in the note and code it separately when required.