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A previous question answered to use unlisted code 37799 for renal vein transposition; however, my physician did a renal vein bypass to the IVC using cryrovein. Does this fall under code 37799, or could you use code 35281 intra-abdominal repair with other than vein (for nutcracker syndrome)? "Procedure: I was able to expose the renal vein back towards the left kidney. Meticulous dissection was performed with blunt sharp dissection, and I was able to expose the renal vein to level of both gonadal vein and adrenal vein. I placed Satinsky clamp on the inferior vena cava where renal vein joined. Also placed Satinsky clamp on the left renal vein at level of adrenal vein . The renal vein was divided at its junction with IVC. The IVC was oversewn with 5-0 prolene. We then did end of renal vein to end of cryopreserved vein anastomosis, as we did not have enough mobility in renal vein itself. We brought this down more distally on the IVC and placed a second clamp. We performed longitudinal venotomy, beveled the cryovein, and performed end to cryovein to side of vena cava anastomosis."