CPT® Code 33430

The procedure described by CPT® Code 33430 involves the surgical replacement of the mitral valve, which is a critical component of the heart located between the left atrium and the left ventricle. This procedure is performed when the mitral valve is severely damaged and cannot be repaired through less invasive techniques. Common conditions that necessitate this replacement include mitral stenosis, where the valve's orifice becomes narrowed, obstructing blood flow from the left atrium to the left ventricle; mitral valve prolapse, characterized by the valve leaflets bulging into the left atrium during contraction; and mitral regurgitation, where the valve fails to close tightly, allowing blood to leak back into the left atrium. The surgical approach typically involves either a median sternotomy or a right anterolateral thoracotomy to access the heart. During the procedure, cardiopulmonary bypass is utilized to maintain circulation and oxygenation while the heart is temporarily stopped. The damaged valve is excised, and a new valve—either a mechanical valve made from materials such as metal and pyrolytic carbon or a biological valve derived from animal tissue—is sutured into place. The new valve's functionality is tested before concluding the procedure, ensuring proper opening and closing. This complex surgical intervention is critical for restoring normal heart function and improving patient outcomes.