Which procedure involves the removal of the pericardium under cardiopulmonary bypass?

The procedure involving the removal of the pericardium under cardiopulmonary bypass is specifically represented by the code 33031. This code is used for the surgical procedure known as a pericardiectomy, where the pericardium, the fibrous sac surrounding the heart, is excised. This procedure may be required in cases of constrictive pericarditis or effusive pericarditis, where there is significant thickening or inflammation of the pericardium.

The use of cardiopulmonary bypass is crucial during this procedure because it allows blood circulation and oxygenation to continue while the heart is temporarily non-functional or while the pericardium is manipulated or excised. This code specifically reflects that the procedure is performed on the pericardium rather than on the heart itself, which is vital for proper classification and billing.

In contrast, the other codes listed pertain to different surgical procedures unrelated to the removal of the pericardium. Recognizing the specific focus of each CPT code assigned to various cardiovascular surgeries is key to accurate coding and understanding the context of procedures performed.