Summary & Overview

CPT 50951: Percutaneous Ureteroscopy for Ureteral Lesions and Stone Removal

CPT code 50951 designates a percutaneous endoscopic evaluation of the kidney, renal pelvis, and ureter performed through an existing skin-to-ureter tract for diagnosis of ureteral lesions and removal of ureteral stones. Nationally, this code captures a specialized urologic procedure used when access via a previously established percutaneous tract is required for visualization or stone extraction. The code is relevant for hospitals and ambulatory surgery centers that manage complex stone disease and ureteral pathology.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a focused overview of clinical context, expected sites of service, and the kinds of reporting and billing considerations associated with percutaneous ureteroscopic procedures. The publication outlines typical utilization settings and clarifies the procedural intent—diagnosis of ureteral lesions and therapeutic stone removal—so stakeholders can align clinical documentation and billing practices.

This report provides benchmarks where available, summarizes policy and coding guidance relevant to percutaneous ureteroscopic procedures, and highlights clinical factors that influence code selection and site-of-service decisions. Data not available in the input are noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 50951urologypercutaneous ureteroscopystone removalendoscopysurgical procedureambulatory surgeryhospital operating room

Billing Code Overview

CPT code 50951 describes an endoscopic examination of the kidney, renal pelvis, and ureters conducted through an existing percutaneous tract between the skin and the ureter. The procedure is performed to diagnose ureteral lesions and to remove ureteral stones.

Service type: Percutaneous ureteroscopy/endoscopic diagnostic and therapeutic procedure
Typical site of service: Ambulatory surgery center or hospital operating room for endoscopic urologic procedures

Clinical & Coding Specifications

Clinical Context

A 52-year-old male with a history of nephrolithiasis presents with acute right flank pain, hematuria, and nausea. Imaging (non-contrast CT KUB) demonstrates a 6 mm proximal right ureteral stone with hydronephrosis. Conservative management and medical expulsive therapy fail. The urology team schedules a ureteroscopic evaluation and treatment via an existing percutaneous nephrostomy tract to visualize the renal pelvis, ureter, and renal calyces, with potential stone extraction or biopsy of a suspicious ureteral lesion.

The clinical workflow includes preoperative evaluation (history, focused renal imaging, labs including coagulation studies), informed consent discussing potential need for stone extraction, stent placement, or conversion to open/alternative procedures, preoperative anesthesia evaluation, performance of the endoscopic procedure using a nephroscope/ureteroscope through the established skin-to-ureter access, intraoperative fluoroscopic guidance as needed, documentation of findings and maneuvers (stone retrieval, basket or laser lithotripsy, lesion biopsy), postoperative orders (pain control, antibiotics if indicated), and follow-up for stent removal and imaging to confirm stone clearance.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	When billing only the physician interpretation/technical reading is split and billed separately from technical services (rare for this procedure).
`52`	Reduced services	When the procedure is partially completed or curtailed but still documented (e.g., limited endoscopic evaluation without stone removal due to instability).
`53`	Discontinued procedure	When the procedure is started but terminated due to an extenuating circumstance or complication prior to completion.
`54`	Surgical care only	When another clinician bills pre/postoperative care and the operating surgeon bills only the intraoperative service.
`55`	Postoperative management only	When another clinician performed the operation and the reporting clinician provides only the postoperative care.
`62`	Two surgeons	When two surgeons work together as primary surgeons performing distinct portions of the procedure.
`66`	Surgical team	When a surgical team approach is used for highly complex cases requiring multiple surgeons.
`78`	Unplanned return to the OR	When a return to the operating room for a related procedure occurs during the global period due to an complication.
`79`	Unrelated procedure or service during global period	When an additional unrelated procedure is performed during the global period.
`LT`	Left side	When the procedure is performed on the left kidney/ureter.
`RT`	Right side	When the procedure is performed on the right kidney/ureter.
`AS`	New patient under ambulatory surgical center payment rules	When the service is furnished in an ASC under payment-specific reporting (site-specific reporting).
`QX`	Ordering and referring physician modifiers (modifier for cert of medical necessity when applicable)	When the service involves separate practitioner arrangements requiring modifier reporting (used with advanced practitioner incident-to scenarios per payer rules).

Taxonomy Code	Specialty	Notes
208000000X	Urology	Primary specialty performing ureteroscopy and nephroscopic procedures.
208100000X	Female Pelvic Medicine & Reconstructive Surgery	Urologists with subspecialty involvement for complex upper tract pathology.
207Q00000X	General Surgery	General surgeons with endourology expertise in select centers.
363L00000X	Nephrology	Rarely performs procedural endoscopy but involved in perioperative renal management.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`N20.1`	Calculus of ureter	Direct indication for ureteroscopic evaluation and removal of ureteral stones.
`N20.0`	Calculus of kidney	Renal stones that may migrate to the ureter or require access to the renal pelvis for removal.
`N20.2`	Calculus of kidney with calculus of ureter	Combined upper tract stone disease often addressed during endoscopic procedures.
`N13.2`	Hydronephrosis with ureteral stricture	May necessitate endoscopic evaluation and intervention via established access.
`N28.89`	Other specified disorders of kidney and ureter	Used for atypical benign lesions or unspecified pathology found during endoscopy.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`52000`	Cystourethroscopy, with or without catheterization; diagnostic, with or without collection of specimen(s) by brushing or washing	Often performed before or after ureteroscopic procedures to inspect bladder/ureteral orifices and place ureteral access sheath or stent.
`52500`	Ureteral dilation, with or without ureteroscopy	May be performed if ureteral narrowing prevents passage of the ureteroscope during the procedure.
`52352`	Cystourethroscopy with ureteroscopy, with removal of calculus (ureteral) by ureteroscopy	Used when ureteroscopy is performed transurethrally for ureteral stone removal rather than through a percutaneous tract; related endoscopic stone removal code.
`50430`	Pyelotomy or nephrolithotomy, with removal of calculus, or removal of infection-related material, via direct incision	An open or percutaneous alternative for large renal stones when endoscopic removal via an established tract is insufficient.
`52332`	Cystourethroscopy, with ureteroscopy, with ablation or laser lithotripsy of ureteral or renal stones	Performed for fragmentation of stones when laser lithotripsy is used in conjunction with ureteroscopic access.

ERROR