Ask Dr. Z

"Prograde right and left heart cath was done. Diagnostic catheter was positioned in the RV apex, and a right ventriculogram was done. Using this image as a guide, 5 French JR 2.5 catheter was positioned in the right ventricular outflow tract and selective angiogram done here. 018 roadrunner wire was advanced through the catheter and across the pulmonary valve in the pulmonary artery. The 018 guidewire was advanced to the right lower lobe pulmonary artery and a 5 French sheath advanced over the guidewire, and the main pulmonary ateriogram was done. After careful assessment of the anatomy 12 mm long Palmaz blue stent pre-mounted on a 6 mm balloon was advanced over the guidewire into the sheath. The balloon was inflated across the pulmonary valve, and the stent was implanted extending from the RV outflow tract and across the pulmonary valve and into the main pulmonary artery." What code best describes placement of the stent? 33999 or 93799?