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Official Description

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

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 50551 involves renal endoscopy performed through an already established nephrostomy or pyelostomy. This procedure is typically indicated for patients who require examination or treatment of the kidney via an existing drainage system. The nephrostomy or pyelostomy tube, which is used to drain urine directly from the kidney or renal pelvis, is utilized as the access point for the endoscopic procedure. The process begins with the removal of the external drainage bag from the nephrostomy or pyelostomy tube, allowing for direct access to the internal drainage system. A guidewire is then advanced through the tube, facilitating the removal of the nephrostomy tube itself over the guidewire. This step is crucial as it prepares the tract for further dilation. Subsequently, a series of dilators are introduced over the guidewire to expand the tract, enabling the safe insertion of the renal endoscope. Once the endoscope is in place, the kidney can be thoroughly examined for any abnormalities. During this procedure, sterile saline or other solutions may be used for irrigation purposes, and diagnostic or therapeutic solutions can be instilled into the kidney. Additionally, contrast material may be introduced for ureteropyelography, which is a separate reportable service. This procedure is essential for diagnosing and treating various renal conditions, ensuring that any obstructions or stenosis can be identified and addressed effectively. Overall, CPT® Code 50551 encompasses a critical intervention that leverages existing nephrostomy or pyelostomy access to facilitate renal examination and treatment.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 50551 is indicated for various conditions related to the kidney and urinary tract. The following are the explicitly provided indications for performing renal endoscopy through an established nephrostomy or pyelostomy:

  • Examination of the Kidney - To visually assess the kidney for abnormalities, lesions, or other pathological conditions.
  • Urinary Obstruction - To investigate and potentially treat obstructions within the urinary tract that may be affecting kidney function.
  • Stenosis - To evaluate and address any narrowing (stenosis) in the ureter or renal pelvis that could impede urine flow.
  • Therapeutic Interventions - To perform therapeutic procedures such as irrigation, instillation of medications, or contrast for imaging purposes.

2. Procedure

The procedure for CPT® Code 50551 involves several critical steps to ensure effective renal endoscopy through an established nephrostomy or pyelostomy:

  • Step 1: Removal of External Drainage Bag - The procedure begins with the careful removal of the external drainage bag from the nephrostomy or pyelostomy tube. This step is essential to gain direct access to the internal drainage system.
  • Step 2: Advancement of Guidewire - A guidewire is then advanced through the nephrostomy or pyelostomy tube. This guidewire serves as a pathway for subsequent steps and is crucial for the safe removal of the nephrostomy tube.
  • Step 3: Removal of Nephrostomy Tube - The nephrostomy tube is removed over the guidewire, allowing for the next phase of the procedure. This step is performed with care to avoid trauma to the surrounding tissues.
  • Step 4: Dilation of the Tract - A series of dilators are advanced over the guidewire to dilate the tract. This dilation is necessary to create sufficient space for the insertion of the renal endoscope.
  • Step 5: Insertion of Renal Endoscope - The renal endoscope is then inserted into the kidney through the established nephrostomy or pyelostomy tract. This allows for direct visualization of the renal structures.
  • Step 6: Examination of the Kidney - The kidney is carefully examined for any abnormalities, lesions, or other conditions that may require intervention.
  • Step 7: Irrigation and Instillation - During the procedure, sterile saline or other solutions may be used to irrigate the kidney. Additionally, a diagnostic or therapeutic solution may be instilled into the kidney, or contrast may be introduced for ureteropyelography.
  • Step 8: Ureteral Catheterization (if applicable) - If further intervention is required, such as in CPT® Code 50553, a ureteral catheter is advanced through the endoscope into the ureter for examination and potential treatment of stenosis.
  • Step 9: Removal of Instruments - After the examination and any necessary interventions are completed, all instruments are removed from the nephrostomy tract.
  • Step 10: Replacement of Nephrostomy Tube - The nephrostomy tube is then replaced, and the external drainage bag is reattached to ensure proper drainage post-procedure.

3. Post-Procedure

Post-procedure care following the renal endoscopy through nephrostomy or pyelostomy involves monitoring the patient for any complications and ensuring the proper functioning of the nephrostomy tube. Patients may be observed for signs of infection, bleeding, or any adverse reactions to the solutions instilled during the procedure. It is essential to ensure that the nephrostomy tube remains patent and that urine is draining adequately. Follow-up imaging or assessments may be required to evaluate the success of the procedure and to monitor for any recurrence of issues such as obstruction or stenosis. Patients should be provided with instructions regarding care of the nephrostomy site and signs to report to their healthcare provider.

Short Descr KIDNEY ENDOSCOPY
Medium Descr RENAL ENDOSCOPY NEPHROSTOMY W/WO IRRIGATION
Long Descr Renal endoscopy through established nephrostomy or pyelostomy, with or without irrigation, instillation, or ureteropyelography, exclusive of radiologic service;
Status Code Active Code
Global Days 000 - Endoscopic or Minor Procedure
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple 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.
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 100 - Endoscopy and endoscopic biopsy of the urinary tract
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).
RT Right side (used to identify procedures performed on the right side of the body)
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.
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.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
82 Assistant surgeon (when qualified resident surgeon not available): the unavailability of a qualified resident surgeon is a prerequisite for use of modifier 82 appended to the usual procedure code number(s).
GC This service has been performed in part by a resident under the direction of a teaching physician
LT Left side (used to identify procedures performed on the left side of the body)
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2010-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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