Thoracoabdominal aortic ectasia

This code describes a localized, abnormal widening or ballooning of the aorta that affects both the thoracic and abdominal segments, but does not meet the criteria for an aneurysm. It represents a degenerative process where the aortic wall has weakened and dilated beyond its normal diameter, yet remains below the threshold for an aneurysm. This ectasia can predispose patients to aneurysm formation or dissection.

Use this code for documented cases of aortic ectasia that explicitly involve both the thoracic and abdominal aorta. This diagnosis is typically made based on imaging studies such as CT scans, MRI, or echocardiography showing diffuse dilatation of the aorta in these regions. Ensure the physician's documentation clearly specifies involvement of both segments and differentiates it from a true aneurysm.

• Do not use this code if the documentation specifies a true aneurysm (e.g., fusiform, saccular); instead, use the appropriate aneurysm code.
• Confirm the documentation explicitly states "thoracoabdominal" involvement; otherwise, use a more specific code for thoracic or abdominal aortic ectasia if only one segment is affected.
• Sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when it is a co-morbidity impacting patient care.