Dissection of ascending aorta

This code signifies a tear in the innermost layer of the ascending aorta, allowing blood to surge between the layers and separate them. This life-threatening condition can lead to rupture, organ malperfusion, or cardiac tamponade.

Apply this code for documented cases of acute or chronic dissection specifically affecting the ascending portion of the aorta, without mention of rupture. Documentation should clearly specify the anatomical location of the dissection.

• Differentiate from other aortic dissection codes based on anatomical site (e.g., aortic arch, descending aorta).
• Ensure documentation specifies "ascending aorta" to support this code.
• If rupture is also documented, a more specific code for ruptured ascending aortic dissection would be appropriate.