ICD-10 Code I72.9 – Aneurysm of unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I72.9 – Aneurysm of unspecified site
What it is
I72.9 identifies an aneurysm when the vessel site is not specified in the documentation. Use it for a localized arterial dilation when the record does not name the affected vessel.
Clinical signs
Clinical features vary; refer to documentation. An aneurysm may be found on imaging, exam, or after symptoms related to compression, pain, or rupture risk are noted.
When to use this code
Use I72.9 when the provider documents an aneurysm but does not identify the artery or other site. It also fits when the note says “unspecified” or the location cannot be confirmed from the record. Check documentation before defaulting to this code.
Do not use for
Do not use this code if the documentation identifies a specific aneurysm site, such as aortic, cerebral, or peripheral vessel aneurysm. Do not use it for dissection or other vascular abnormalities unless the provider clearly documents aneurysm.
Coding tip
Query for the exact vessel when the site is missing, because a more specific code is preferred over I72.9.