Dissection of thoracoabdominal aorta

This code signifies a tear in the inner lining of the aorta that extends through both the thoracic and abdominal segments, allowing blood to flow between the layers of the aortic wall. This creates a false lumen and can compromise blood flow to vital organs. It represents an acute and life-threatening vascular emergency.

Assign this code when medical record documentation clearly indicates a dissection involving both the thoracic and abdominal aorta. This diagnosis is typically supported by imaging studies such as CT angiography, MRI, or transesophageal echocardiography, confirming the location and extent of the dissection.

• Distinguish from dissections confined to only the thoracic (I71.01-) or abdominal (I71.02-) segments.
• Always review imaging reports and physician notes for precise anatomical location and extent of the dissection.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter and treatment.