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Official Description

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

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

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.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 50561 is indicated for the following conditions:

  • Foreign Body Removal The procedure is performed to remove foreign bodies that may have entered the renal system, causing obstruction or other complications.
  • Calculus Extraction It is indicated for the removal of renal calculi (stones) that can lead to pain, infection, or urinary obstruction.

2. Procedure

The procedure involves several critical steps to ensure successful renal endoscopy through an established nephrostomy or pyelostomy:

  • Step 1: Preparation The external drainage bag attached to the nephrostomy or pyelostomy tube is carefully removed to prepare for the endoscopic procedure. This step is essential to gain direct access to the nephrostomy or pyelostomy tract.
  • Step 2: Guidewire Advancement A guidewire is advanced through the nephrostomy or pyelostomy tube. This guidewire serves as a pathway for subsequent instruments and helps maintain the tract's integrity during the procedure.
  • Step 3: Nephrostomy Tube Removal The nephrostomy tube is then removed over the guidewire, allowing for the next steps in the procedure to be performed without losing access to the renal system.
  • Step 4: Tract Dilation A series of dilators are advanced over the guidewire to dilate the tract adequately. This dilation is crucial to allow the insertion of the nephroscope, which is necessary for visualizing the kidney.
  • Step 5: Nephroscope Insertion A renal endoscope, or nephroscope, is inserted into the kidney through the established nephrostomy or pyelostomy tract. This instrument provides direct visualization of the renal pelvis and calyces.
  • Step 6: Examination and Irrigation The kidney is carefully examined for the presence of foreign bodies or calculi. During this examination, sterile saline or other solutions may be used to irrigate the kidney, enhancing visibility and facilitating the identification of any obstructions.
  • Step 7: Instillation of Solutions A diagnostic or therapeutic solution may be instilled into the kidney as needed. Additionally, contrast material may be used for radiopyelography, which is a separate reportable service.
  • Step 8: Foreign Body or Calculus Removal An endograsper is introduced through the nephroscope to grasp and remove the foreign body or calculus. This step is critical to alleviate any obstruction and restore normal kidney function.
  • Step 9: Final Inspection After the removal, the renal pelvis and calyces are inspected again to ensure that all fragments of the foreign body or calculus have been completely removed.
  • Step 10: Completion of Procedure All instruments are carefully removed from the nephrostomy or pyelostomy tract. The nephrostomy tube is then replaced, and the external drainage bag is reattached to the nephrostomy tube, completing the procedure.

3. Post-Procedure

Post-procedure care involves monitoring the patient for any complications that may arise following the renal endoscopy. Patients may be observed for signs of infection, bleeding, or any adverse reactions to the anesthesia used during the procedure. The nephrostomy tube will typically remain in place for a period to ensure proper drainage and healing. Follow-up imaging may be required to confirm the successful removal of the foreign body or calculus and to assess the overall condition of the renal system. Patients should be advised on signs and symptoms that warrant immediate medical attention, such as increased pain, fever, or changes in urine output.

Short Descr KIDNEY ENDOSCOPY & TREATMENT
Medium Descr RENAL NDSC NEPHROS/PYELOSTOMY RMVL FB/CALCULUS
Long Descr 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
Status Code Active Code
Global Days 000 - Endoscopic or Minor Procedure
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 3 - Special payment adjustment rules for multiple endoscopic procedures apply.
Bilateral Surgery (50) 1 - 150% payment adjustment for bilateral procedures applies.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Endoscopic Base Code 50551  Renal endoscopy through established nephrostomy or pyelostomy, with or without irrigation, instillation, or ureteropyelography, exclusive of radiologic service;
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Surgical procedure on ASC list in CY 2007; payment based on OPPS relative payment weight.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P8I - Endoscopy - other
MUE 1
CCS Clinical Classification 101 - Transurethral excision, drainage, or removal urinary obstruction
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
50 Bilateral procedure: unless otherwise identified in the listings, bilateral procedures that are performed at the same session, should be identified by adding modifier 50 to the appropriate 5 digit code. note: this modifier should not be appended to designated "add-on" codes (see appendix d).
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
52 Reduced services: under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. this provides a means of reporting reduced services without disturbing the identification of the basic service. note: for hospital outpatient reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well-being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
GW Service not related to the hospice patient's terminal condition
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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