CPT® Code 50320

A donor nephrectomy is a surgical procedure performed to remove a kidney from a living donor for transplantation purposes. This specific procedure, identified by CPT® Code 50320, involves an open surgical approach and includes the cold preservation of the donor kidney. The term "cold preservation" refers to the technique used to maintain the viability of the kidney during the time it is removed from the donor until it is transplanted into the recipient. The procedure begins with the identification and incision of the lateral line of Toldt, which is a peritoneal reflection that allows access to the kidney. The peritoneum, a membrane lining the abdominal cavity, is then mobilized to visualize the anterior surface of the kidney. During the surgery, the colon is carefully mobilized and rolled medially to provide better access to the kidney. The colorenal ligaments, which support the kidney, are divided, and Gerota's fascia, a layer of connective tissue surrounding the kidney, is exposed. The ureter, which carries urine from the kidney to the bladder, along with the surrounding vascular structures, is identified and retracted to enhance visibility of the lower pole of the kidney and the renal hilum, the area where blood vessels and nerves enter and exit the kidney. The procedure requires meticulous dissection to ensure that the renal artery and vein are properly identified and preserved while leaving certain attachments intact to prevent torsion and vascular damage. Once the kidney is fully mobilized and detached from its vascular supply, it is removed from the donor's body. The kidney may then be perfused with a cold preservation solution or placed on ice to ensure its viability until it can be transplanted into the recipient. This detailed process is critical for the successful transplantation of the kidney and the overall success of the transplant surgery.