CPT® Code 50561

Renal endoscopy through established nephrostomy or pyelostomy, with or without irrigation, instillation, or ureteropyelography, exclusive of radiologic service; with removal of foreign body or calculus

The procedure described by CPT® Code 50561 involves renal endoscopy performed through an already established nephrostomy or pyelostomy. This procedure is specifically aimed at the removal of foreign bodies or calculi (stones) from the kidney. A nephrostomy is a surgical procedure that creates an opening from the kidney to the outside of the body, allowing for drainage of urine, while a pyelostomy is similar but involves the renal pelvis. In this endoscopic approach, the external drainage bag connected to the nephrostomy or pyelostomy tube is first removed to facilitate access. A guidewire is then advanced through the tube, allowing for the nephrostomy tube to be removed over the guidewire, which helps maintain the tract's patency. Following this, a series of dilators are used to expand the tract sufficiently to accommodate the insertion of a renal endoscope, also known as a nephroscope. This specialized instrument enables the physician to visually inspect the kidney and locate the foreign body or stone. During the procedure, sterile saline or other solutions may be utilized for irrigation, and diagnostic or therapeutic solutions may be instilled into the kidney. Additionally, contrast material may be used for radiopyelography, which is a separate reportable service. The removal of the foreign body or calculus is accomplished using an endograsper introduced through the nephroscope. After ensuring that all fragments have been successfully extracted, the nephrostomy tube is replaced, and the external drainage bag is reattached, completing the procedure.