Dissection of descending thoracic aorta

This diagnosis code signifies an aortic dissection specifically affecting the descending portion of the thoracic aorta. It describes a tear in the innermost layer of the aortic wall, allowing blood to flow between the layers and separate them. This condition is a serious medical emergency due to the risk of rupture and organ malperfusion.

This code is appropriate when documentation clearly indicates a dissection located in the descending thoracic aorta. Clinical scenarios include patients presenting with acute chest or back pain, often radiating, and confirmed by imaging studies such as CT angiography or MRI. The physician's notes should specify the anatomical location of the dissection.

• Differentiate carefully between ascending, descending, and thoracoabdominal aortic dissections, as each has a specific code.
• Ensure documentation specifies "dissection" and not merely an aneurysm or rupture without dissection.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter and treatment.