Thoracic aneurysm without mention of rupture

This code signifies an abnormal dilation or bulging of a segment of the aorta within the chest cavity, specifically when there is no indication of a tear or breach in the arterial wall. It represents a weakening of the aortic wall that can lead to serious complications if left untreated.

Apply this code for patients diagnosed with a thoracic aortic aneurysm identified through imaging studies (e.g., CT scan, MRI, echocardiogram) where the documentation explicitly states "without rupture." This code is appropriate for initial diagnosis, surveillance, or pre-operative planning for an unruptured thoracic aneurysm.

• Always review imaging reports and physician notes to confirm the location (thoracic) and absence of rupture.
• Distinguish from abdominal aortic aneurysms, which are coded differently.
• If rupture is documented, a different code indicating rupture must be used.