Ask Dr. Z

"History: Patient with a previously created RT brachiocephalic AV fistula with severe stenosis that required an interposition graft who now suffers from elevated pressures during dialysis. Pre-op fistulogram showed widely patent SVC, IJ, and cephalic veins, but high grade occluded subclavian vein with the inability to be recanalized endovascularly. Operation: Incisions made and RT cephalic and IJ veins identified and dissected. Subcutaneous tunnel was created between the cephalic and IJ veins that an 8 mm ringed PTFE was brought thru. Venotomies made in both the cephalic and IJ veins and end-to-side anastomosis were created. There was no palpable thrill in the bypass graft or in the IJ vein. Retrograde fistulogram showed stenosis of the AV fistula. 5 French sheath was placed in the AV fistula, and the stenosis was angioplastied with a balloon with brisk thrill throughout the AV fistula." Are codes 36832 and 36902 correct? Or should it be an unlisted CPT code? If unlisted, what CPT codes are comparable to this procedure?