CPT® Code 50557

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

The procedure described by CPT® Code 50557 involves renal endoscopy performed through an already established nephrostomy or pyelostomy. This technique is utilized to access the kidney for various diagnostic and therapeutic purposes, including the fulguration of lesions or obtaining biopsies. The process begins with the removal of the external drainage bag from the nephrostomy or pyelostomy tube, allowing for direct access to the urinary tract. A guidewire is then advanced through the tube, facilitating the removal of the nephrostomy tube itself. Following this, a series of dilators are utilized to expand the tract, enabling the insertion of a renal endoscope. This endoscope allows for a thorough examination of the kidney's internal structures. During the procedure, sterile saline or other solutions may be used for irrigation, and diagnostic or therapeutic agents can be instilled into the kidney. Additionally, contrast material may be introduced for radiopyelography, which is a separate reportable service. After the examination, if necessary, biopsy forceps can be introduced to collect tissue samples, or an electrocautery tool may be used to destroy lesions or incise the renal pelvis or calyces. The procedure concludes with the removal of all instruments, replacement of the nephrostomy tube, and reattachment of the external drainage bag, ensuring that the patient’s drainage system is restored to its functional state.