For renal autotransplantation extracorporeal (bench) surgery, CPT directs the coder to use autotransplantation as the primary procedure and report secondary procedures such as partial nephrectomy or nephrolithotomy with modifier:

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Modifier 51 is used to indicate multiple procedures performed during the same surgical session, which is appropriate for reporting secondary procedures such as partial nephrectomy or nephrolithotomy in conjunction with renal autotransplantation.

For Renal Autotransplantation Extracorporeal (Bench) Surgery, CPT Directs the Coder