Which procedure is indicated by the CPT® code 33464?

The CPT® code 33464 corresponds specifically to the procedure of aortic valve replacement. This surgical intervention is performed to treat conditions such as aortic stenosis or aortic regurgitation, where the aortic valve does not open or close properly, leading to compromised blood flow from the heart to the rest of the body.

During an aortic valve replacement, the diseased aortic valve is excised and replaced with a prosthetic valve, which can be either mechanical or biological in nature. The code not only indicates the replacement of the aortic valve but also implies that the procedure is performed via an open-heart surgery approach, often involving cardiopulmonary bypass.

In contrast, the other procedures listed involve different anatomical structures and treatment goals: mitral valve repair addresses issues with the mitral valve, coronary artery bypass focuses on restoring blood flow in coronary arteries, and closure of a ventricular septal defect involves repairing a congenital heart defect between the heart's ventricles. Thus, the specificity of the code to aortic valve replacement makes it the correct choice in this context.