CPT® Code 50555

Renal endoscopy through established nephrostomy or pyelostomy, with or without irrigation, instillation, or ureteropyelography, exclusive of radiologic service; with biopsy

The procedure described by CPT® Code 50555 involves renal endoscopy performed through an already established nephrostomy or pyelostomy. This technique is utilized primarily to obtain a biopsy or to fulgurate, or destroy, lesions within the kidney. The process begins with the removal of the external drainage bag from the nephrostomy or pyelostomy tube, which is essential for accessing the kidney. A guidewire is then carefully advanced through the tube, allowing for the nephrostomy tube to be removed over the guidewire, ensuring that the tract remains open for further procedures. Following this, a series of dilators are utilized to expand the tract sufficiently to accommodate the insertion of a renal endoscope. Once the endoscope is in place, the kidney is meticulously examined. During this examination, sterile saline or another suitable solution may be used for irrigation purposes, and diagnostic or therapeutic solutions can be instilled into the kidney. Additionally, contrast material may be introduced for radiopyelography, which is a separate procedure that is not included in this code. After the examination, biopsy forceps are introduced through the endoscope to obtain one or more tissue samples from the kidney. This procedure is critical for diagnosing various renal conditions. Following the biopsy, all instruments are removed, the nephrostomy tube is replaced, and the external drainage bag is reattached, completing the procedure. This comprehensive approach allows for both diagnostic and therapeutic interventions within the renal system through a minimally invasive technique.