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    v1.0.30
    OpenPayerBilling CodesEndoscopy Procedures on the KidneyCPT cpt-50551-endoscopic-examination-kidney-renal-pelvis-ureter
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    CPT 50551: Endoscopic Examination of Kidney via Existing Nephrostomy

    Medicare pays $387 on average nationally for this procedure.

    CPT code 50551 describes endoscopic examination of the kidney, renal pelvis, and ureter performed through a previously established percutaneous or cutaneous opening (for example, a nephrostomy or fistula); this is a diagnostic endoscopic renal/pyeloscopic procedure typically performed in an operating room or procedure suite and classified as a percutaneous/endoscopic kidney service.

    For related coverage guidance, see recent payer policy updates: Vafseo (vadadustat) for anemia in CKD on dialysis, Metabolic Disorders - Cysteamine (Oral) Products for Individual and Family Plans, Kerendia (finerenone) — Coverage Criteria.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult presenting with kidney stone disease, recurrent hematuria, or suspected upper urinary tract pathology after prior percutaneous access (nephrostomy tract or previously created nephrostomy). The patient often has imaging (CT abdomen/pelvis without contrast or renal ultrasound) showing retained calculi, filling defects in the renal pelvis, or persistent obstruction. Preoperative assessment includes review of prior procedures and nephrostomy tract maturity, coagulation status, and anesthesia evaluation.

    The procedure is performed in an operating room or interventional suite under general or regional anesthesia. A previously established percutaneous tract (nephrostomy or nephro-ureterostomy) is used to introduce a flexible or rigid endoscope into the renal collecting system for direct visualization of the renal pelvis, calyces, and ureter. Intraoperative steps include confirmation of tract patency, passage of the endoscope, irrigation for visualization, inspection for stones, strictures, or tumors, and possible adjunctive interventions (stone extraction, laser lithotripsy, biopsy). Urine culture and prophylactic antibiotics are managed according to institutional guidelines. Postoperative workflow includes imaging or nephrostogram if indicated, management of the existing external drainage catheter or placement of a ureteral stent, pain control, and discharge planning, typically same-day or overnight depending on clinical complexity and comorbidities.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    50590Lithotripsy, extracorporeal shock wave (ESWL)Noninvasive option for renal stones that may be used before or after percutaneous endoscopic evaluation depending on stone burden and location.
    50605Renal pelvis exploration through open incision (limited)Open surgical alternative when percutaneous access and endoscopic management are not feasible.
    52353Cystourethroscopy, with ureteroscopy and/or pyeloscopy, with removal of calculusUreteroscopy/pyeloscopy performed via natural urinary tract; may be used instead of or in combination with percutaneous endoscopic approaches.
    50080Nephrostomy, percutaneous, with placement of drainage catheter, including imaging guidanceCreation or re-establishment of percutaneous renal access tract which may precede 50551.
    50556Percutaneous nephrostolithotomy, with fragmentation and removal of stone(s)Complete percutaneous stone removal procedure; 50551 may be performed for diagnostic exam through an existing tract while 50556 is used when fragmentation/removal is performed through percutaneous access.

    Related Modifiers

    12 rows

    ModifierDescriptionWhen to Use
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    79Modifier 79 indicates a surgical procedure performed during the postoperative global period of a prior surgery that is unrelated to the original procedure. Per AMA/CPT and CMS guidance, it is…- Use modifier 79 when the same physician (or same‑specialty physician in the same group) performs a surgical procedure during the postoperative global period of a prior surgery and the new procedure…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    51Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…

    Showing 1–10 of 12

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    2080P0208X
    208VP0014X
    2080P0207X
    246QB0000X
    207QS1201X
    261QA0900X
    2080P0206X
    2080P0202X

    Related ICD-10-CM Codes

    27 rows

    ICD-10-CM CodeDescription
    D41.4Neoplasm of uncertain behavior of bladder
    N10Acute pyelonephritis
    N11.0Nonobstructive reflux-associated chronic pyelonephritis
    N11.1Chronic obstructive pyelonephritis
    N13.6Pyonephrosis
    N13.8Other obstructive and reflux uropathy
    N20.0Calculus of kidney
    N20.1Calculus of ureter
    N20.2Calculus of kidney with calculus of ureter
    N21.0Calculus in bladder

    Showing 1–10 of 27

    Related Payer Policy Updates

    Specialty: Nephrology1 / 2

    10 rows

    PolicyPayerEffective Date
    Vafseo (vadadustat) for anemia in CKD on dialysisCigna2026-08-15
    Metabolic Disorders - Cysteamine (Oral) Products for Individual and Family PlansCigna2026-08-15
    Kerendia (finerenone) — Coverage CriteriaBlue Cross Blue Shield - Iowa2026-08-05
    Voyxact (sibeprenlimab-szsl) — Prior authorization / medical necessity for primary IgA nephropathyColorado Rocky Mountain Health Plans2026-08-01
    Oxlumo (lumasiran) and Rivfloza (nedosiran) — Coverage Criteria (Ohio)Colorado Rocky Mountain Health Plans2026-08-01
    Korsuva (difelikefalin) — Medical Benefit Drug Coverage Criteria (Ohio)Colorado Rocky Mountain Health Plans2026-08-01
    Complement Inhibitors - EmpaveliCigna2026-08-01
    Tolvaptan (Jynarque)Cigna2026-08-01
    Nephrology - Filspari (sparsentan) coverageCigna2026-08-01
    Rivfloza (nedosiran) prior authorization for PH1UnitedHealthcare2026-08-01

    Related Codes

    CPT-50553-ENDOSCOPIC-EXAMINATION-KIDNEY-RENAL-PELVIS-CATHETER

    CPT 50553: Nephroscopy Through Established Percutaneous/Pyelostomy Tract

    CPT-50555-RENAL-ENDOSCOPY-PYELOSCOPIC-BIOPSY

    CPT 50555: Nephroscopy with Biopsy via Established Access

    CPT-50557-ENDOSCOPIC-RENAL-PROCEDURE-TISSUE-DESTRUCTION-INCISION

    CPT 50557: Percutaneous Nephroscopy With Tissue Destruction/Incision

    CPT-50561-PERCUTANEOUS-RENAL-ENDOSCOPY-STONE-FOREIGN-BODY-REMOVAL

    CPT 50561: Percutaneous Nephroscopy with Stone/Foreign Body Removal

    CPT-50562-ENDOSCOPIC-RENAL-TUMOR-REMOVAL

    CPT 50562: Nephroscopy With Tumor Removal

    CPT-50570-PERCUTANEOUS-ENDOSCOPIC-RENAL-VISUALIZATION

    CPT 50570: Nephrostomy with Endoscopic Evaluation

    CPT-50572-ENDOSCOPIC-EXAMINATION-KIDNEY-RENAL-PELVIS-URETER

    CPT 50572: Nephrostomy Endoscope Examination of Kidney and Renal Pelvis

    CPT-50574-PERCUTANEOUS-ENDOSCOPIC-RENAL-EVALUATION-BIOPSY

    CPT 50574: Endoscopic Examination of Kidney with Biopsy

    CPT-50575-ANTEGRADE-ENDOPYELOTOMY-UPJ-STRICTURE

    CPT 50575: Antegrade Endopyelotomy for UPJ Stricture

    CPT-50576-ENDOSCOPIC-RENAL-PELVIS-EVALUATION-BIOPSY-ABLATION

    CPT 50576: Percutaneous Nephroscopy with Biopsy and Ablation

    Showing 1–10 of 11

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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