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    v1.0.30
    OpenPayerBilling CodesRepair Procedures on the KidneyCPT cpt-50434-percutaneous-nephrostomy-to-nephroureteral-conversion
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    CPT 50434: Image-Guided Nephrostomy to Nephroureteral Catheter Conversion

    Medicare pays $902 on average nationally for this procedure.

    CPT code 50434 describes an image-guided procedure using ultrasound and/or fluoroscopy to convert an existing percutaneous nephrostomy catheter to a nephroureteral catheter to divert urine around a blockage in the renal pelvis or ureter; the service includes optional contrast injection for a nephrostogram and ureterogram, and encompasses the complete diagnostic imaging procedure with radiological supervision and interpretation. Service type: percutaneous interventional radiology procedure. Typical site of service: outpatient interventional radiology suite or hospital radiology department (image-guided procedural setting).

    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 68-year-old male with a history of metastatic prostate cancer presents with progressive hydronephrosis of the left kidney and recurrent flank pain. He previously underwent placement of a left percutaneous nephrostomy catheter for urinary diversion. Imaging demonstrates persistent ureteral obstruction from extrinsic tumor invasion of the distal ureter and poor antegrade drainage through the existing nephrostomy catheter. Interventional radiology schedules the patient for conversion of the existing percutaneous nephrostomy catheter to a nephroureteral catheter using real-time imaging guidance (ultrasound and/or fluoroscopy) to traverse the renal pelvis and advance a catheter down the ureter into the bladder to restore internal and external drainage.

    The clinical workflow includes pre-procedure assessment (review of coagulation status, informed consent, review of prior imaging and nephrostomy catheter position), percutaneous access via the existing tract, fluoroscopic and/or ultrasound guidance to exchange the nephrostomy catheter for a nephroureteral catheter, optional injection of contrast for nephrostogram/ureterogram to document anatomy and level of obstruction, radiological supervision and interpretation, and post-procedure imaging to confirm catheter position and function. The procedure is performed in an interventional radiology suite or hospital operating room with appropriate monitoring and sedation. Post-procedure instructions address catheter care, urine output monitoring, and outpatient follow-up for definitive management such as ureteral stent placement or oncologic therapy.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    50690Percutaneous nephrostomy, including imaging guidance, with or without dilation, with catheter placementOften performed initially to establish external renal drainage prior to conversion to a nephroureteral catheter.
    50432Exchange of nephrostomy catheter, imaging guidancePerformed when a simple catheter exchange is done rather than conversion to a nephroureteral catheter.
    52005Cystourethroscopy, with ureteral catheterization, including injection for radiologic evaluationMay be used in conjunction when antegrade or retrograde access and evaluation of the ureterovesical junction is required.
    74240Urography, radiological supervision and interpretation, including contrast; excretory (pyelography)Contrast studies such as nephrostogram/ureterogram are performed during the conversion for anatomical assessment and may be reported with appropriate imaging codes.
    76942Ultrasonic guidance for needle placement (e.g., for renal access)Ultrasound guidance for access or catheter exchange may be reported when performed per payer policy.

    Related Modifiers

    13 rows

    ModifierDescriptionWhen to Use
    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…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…
    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…
    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…
    66Modifier 66 (Surgical Team) is used when three or more surgeons act as primary surgeons on a single, highly complex procedure. The AMA defines it for use when a surgical team — often composed of…- Use modifier 66 when three or more surgeons act as primary surgeons working collaboratively as a surgical team on a single, highly complex or difficult procedure (for example organ…
    73Modifier 73 indicates a facility-level outpatient hospital or ASC procedure that was discontinued after the patient was prepared and taken to the procedure/operating room but before any anesthesia…- When to use: Apply CPT modifier 73 on the FACILITY (outpatient hospital or ASC) claim when the patient has been fully prepared and physically taken into the procedure/operating room but the…

    Showing 1–10 of 13

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    208600000X
    207P00000X
    207L00000X
    208800000X
    1223D0004X
    207RM1200X
    1835P0018X
    174N00000X

    Related Payer Policy Updates

    Specialty: Nephrology1 / 3

    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-50400-PYELOPLASTY-URETEROPELVIC-JUNCTION-REPAIR

    CPT 50400: Pyeloplasty, Ureteropelvic Junction Reconstruction

    CPT-50405-PYELOPLASTY-URETEROPELVIC-JUNCTION-RECONSTRUCTION

    CPT 50405: Pyeloplasty to Reconstruct Ureteropelvic Junction

    CPT-50430-PERCUTANEOUS-URETEROGRAM-NEPHROSTOGRAM-DIAGNOSTIC

    CPT 50430: Percutaneous Ureterogram/Nephrostogram with Contrast

    CPT-50431-NEPHROSTOGRAM-URETEROGRAM-CONTRAST-STUDY

    CPT 50431: Contrast Injection for Nephrostogram or Ureterogram

    CPT-50432-PERCUTANEOUS-NEPHROSTOMY-WITH-IMAGING-GUIDANCE

    CPT 50432: Percutaneous Nephrostomy Catheter Placement with Imaging

    CPT-50433-PERCUTANEOUS-NEPHROSTOMY-IMAGE-GUIDED-RENAL-DRAINAGE

    CPT 50433: Percutaneous Nephrostomy Catheter Placement

    CPT-50435-PERCUTANEOUS-NEPHROSTOMY-CATHETER-EXCHANGE-IMAGE-GUIDANCE

    CPT 50435: Percutaneous Nephrostomy Catheter Exchange with Imaging

    CPT-50500-KIDNEY-WOUND-SUTURE-REPAIR

    CPT 50500: Kidney Wound Suture

    CPT-50520-NEPHROCUTANEOUS-PYELOCUTANEOUS-FISTULA-CLOSURE

    CPT 50520: Nephrocutaneous and Pyelocutaneous Fistula Closure

    CPT-50525-RENAL-FISTULA-CLOSURE-ABDOMINAL-APPROACH

    CPT 50525: Closure of Renal Fistula, Abdominal Approach

    Showing 1–10 of 12

    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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