ICD-10 Code I71.12 – Aneurysm of the aortic arch, ruptured (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I71.12 – Aneurysm of the aortic arch, ruptured
What it is
I71.12 identifies a ruptured aneurysm of the aortic arch. Use it when the arch portion of the aorta has weakened, enlarged, and torn, causing blood to leak outside the vessel wall.
Clinical signs
Clinical features vary; refer to documentation. Common references describe sudden severe chest, back, or upper chest pain, signs of acute blood loss, and imaging or operative confirmation of rupture.
When to use this code
Use this code when the provider documents a ruptured aneurysm specifically involving the aortic arch. It may be supported by CT, angiography, surgery, or discharge diagnosis wording that clearly states rupture. Do not infer rupture from aneurysm alone.
Do not use for
Do not use I71.12 for an unruptured aortic arch aneurysm or for aneurysms in other aortic segments. Check documentation if the record only says dissection, thoracic aneurysm, or suspected rupture.
Coding tip
Code rupture only when the record explicitly links rupture to the aortic arch aneurysm.