Coronary artery aneurysm

This diagnosis code signifies an acquired, localized, and abnormal dilation or ballooning of a coronary artery. It represents a non-congenital weakening and expansion of the vessel wall, which can lead to various cardiac complications.

Use this code when documentation clearly indicates an acquired coronary artery aneurysm, often identified through imaging studies like angiography or echocardiography. This applies to adult patients where the aneurysm is not present from birth.

• Differentiate carefully between acquired and congenital coronary aneurysms; congenital cases are excluded.
• Ensure the medical record specifies "acquired" or provides sufficient detail to rule out a congenital origin.
• Code any associated coronary artery disease or other cardiac conditions separately.