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CPT 50433: Image-Guided Percutaneous Nephrostomy

CPT code 50433 represents an image-guided percutaneous nephrostomy with creation of a new renal access tract, often including contrast injection for nephrostogram and ureterogram. Nationally, this code captures a commonly used interventional radiology procedure for urinary diversion in the setting of obstruction, and it matters for hospital, outpatient, and ambulatory surgical center billing because of its procedural complexity and imaging components. Key payers in typical analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will find a concise explanation of clinical intent and service setting, typical billing considerations, and the payer landscape summary. The publication provides benchmarks for utilization and reimbursement patterns where available, outlines common claims-line modifiers and coding considerations, and situates the procedure within clinical workflows for interventional radiology. It also highlights areas where policy updates or payer edits commonly affect claims processing. Data not available in the input is noted where applicable.

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Billing Code Overview

CPT code 50433 describes a percutaneous nephrostomy with imaging guidance. The procedure uses ultrasound and/or fluoroscopy to place a catheter through the skin into the kidney to divert urine when there is obstruction of the renal pelvis or ureter. The provider may inject contrast to perform a nephrostogram and/or ureterogram to image internal renal and ureteral structures. The service includes creation of a new percutaneous access tract and radiological supervision and interpretation of imaging.

Service type: Image-guided percutaneous renal drainage and diagnostic contrast study
Typical site of service: Hospital inpatient or outpatient interventional radiology suite; may also be performed in ambulatory surgical centers with appropriate imaging capabilities

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CPT 50433: Image-Guided Percutaneous Nephrostomy

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Billing Code Overview

Service type: Image-guided percutaneous renal drainage and diagnostic contrast study
Typical site of service: Hospital inpatient or outpatient interventional radiology suite; may also be performed in ambulatory surgical centers with appropriate imaging capabilities

Clinical & Coding Specifications

Clinical Context

A 68-year-old male with known right-sided renal calculi and progressive hydronephrosis presents with fever, flank pain, and rising serum creatinine. Imaging (CT abdomen/pelvis) demonstrates obstruction of the right renal pelvis from a 1.5 cm proximal ureteral stone with upstream dilatation and concern for infected obstructed kidney (pyonephrosis). The urology and interventional radiology teams coordinate care. The patient is brought to the interventional radiology suite where the operator uses ultrasound and fluoroscopic guidance to percutaneously access the renal collecting system and place a percutaneous nephrostomy catheter for urinary diversion. Contrast may be injected to perform a nephrostogram and antegrade ureterogram to delineate anatomy and locate the level of obstruction. The procedure creates a new percutaneous access tract, secures catheter position, and includes radiological supervision and interpretation. Typical workflow includes pre-procedure consent and coagulation review, procedural imaging and access, catheter placement and securement, immediate post-procedure imaging to confirm position and contrast drainage, and brief post-anesthesia recovery with instructions for catheter care and plans for definitive management (stone removal, stent placement, or delayed nephrostomy removal). Typical site of service is the hospital-based interventional radiology suite or ambulatory surgical center for stable patients; inpatient placement is common for infected obstruction or renal impairment requiring urgent decompression.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when reporting only the physician component of radiological supervision/interpretation separate from technical facility resources, if split billing applies.
`50`	Bilateral procedure	Use when percutaneous nephrostomy catheters are placed on both kidneys during the same operative session.
`51`	Multiple procedures	Use when another distinct procedural CPT is reported during the same session in addition to the nephrostomy placement.
`52`	Reduced services	Use when the service is partially reduced or not completed as planned (e.g., inability to obtain access to the collecting system).
`53`	Discontinued procedure	Use when the procedure is terminated after initiation for patient-related or clinical reasons.
`59`	Distinct procedural service	Use when an additional procedure not normally bundled with the nephrostomy placement is performed and meets distinct procedural criteria.
`62`	Two surgeons	Use when two physicians of different specialties perform distinct surgical portions requiring a co-surgeon arrangement.
`76`	Repeat procedure by same physician	Use when the same physician repeats the procedure later the same day.
`77`	Repeat procedure by another physician	Use when another physician repeats the procedure the same day.
`78`	Return to operating room for a related procedure after initial service	Use when the patient returns to the OR/IR suite for a related procedure during the global period (e.g., re-intervention for catheter malposition).
`79`	Unrelated procedure or service by same physician during global period	Use when an unrelated service occurs during the postoperative global period (less commonly applied to IR).
`26`	(Note: `26` already listed above)	(Duplicate removed if payer forbids duplicated modifiers.)

Taxonomy Code	Specialty	Notes
207RG0100X	Interventional Radiology	Most common specialty performing percutaneous nephrostomy placement; includes imaging guidance and catheter placement.
208800000X	Urology	Urologists may perform nephrostomy placement in operative or bedside settings for urinary diversion.
363L00000X	Diagnostic Radiology	Diagnostic radiologists with procedural privileges perform image-guided renal drainage procedures.
2080P0207X	General Surgery	General surgeons with endourology or trauma privileges may perform emergent renal drainage procedures.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`N13.6`	Pyonephrosis	Indicates infected obstructed kidney requiring urgent drainage via percutaneous nephrostomy.
`N13.2`	Hydronephrosis with ureteral stricture	Reflects obstruction of urine flow amenable to percutaneous decompression.
`N20.0`	Calculus of kidney	Kidney stones causing obstruction and necessitating nephrostomy for diversion or access.
`N13.8`	Other obstructive and reflux uropathy	Catch-all for non-specific obstructive causes requiring drainage.
`N28.9`	Disorder of kidney and ureter, unspecified	Used when specific diagnosis not yet determined but intervention is clinically indicated.
`N39.0`	Urinary tract infection, site not specified	Infection in the setting of obstruction may prompt decompression with nephrostomy.
`N11.0`	Chronic tubulo-interstitial nephritis	Chronic renal conditions complicated by obstruction and need for drainage in select cases.
`N99.99`	Data not available in the input.	Data not available in the input.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`50432`	Percutaneous nephrostomy catheter placement, initial; without imaging guidance (separate code for non-image-guided approaches)	May be reported in limited settings if access is gained without image guidance; typically not used when ultrasound/fluoroscopy is employed.
`50392`	Nephrostomy or pyelostomy placement, percutaneous, with imaging guidance (diagnostic/therapeutic) — historically used in some coding sets	Related alternative codes in older or payer-specific coding; confirms the role of imaging guidance for access and drainage.
`74450`	Radiologic examination, antegrade pyelogram (nephrostogram), including fluoroscopic guidance	Commonly performed during the procedure to delineate collecting system anatomy and level of obstruction; contrast injection and imaging documented separately if billed.
`51702`	Per urethral catheterization, single or intermittent catheterization for drainage, simple (eg, straight catheterization)	May be performed pre- or post-procedure for bladder drainage or contrast study coordination but is typically separate from nephrostomy placement.
`99500`	Infant or pediatric basic life support (if applicable)	Applicable in pediatric or special circumstances requiring documented resuscitation preparedness; included here as an occasional adjunct.

CPT 50400: Pyeloplasty for Ureteropelvic Junction Obstruction

CPT-50405-PYELOPLASTY-URETEROPELVIC-JUNCTION-RECONSTRUCTION

CPT 50405: Pyeloplasty for Ureteropelvic Junction Obstruction

CPT-50430-PERCUTANEOUS-URETEROGRAM-NEPHROSTOGRAM-DIAGNOSTIC

CPT 50430: Percutaneous Ureterogram/Nephrostogram Diagnostic Study

CPT-50431-NEPHROSTOGRAM-URETEROGRAM-CONTRAST-STUDY

CPT 50431: Nephrostogram or Ureterogram via Existing Access

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

CPT 50432: Image-Guided Percutaneous Renal Pelvis Catheter Placement

CPT-50434-PERCUTANEOUS-NEPHROSTOMY-TO-NEPHROURETERAL-CONVERSION

CPT 50434: Percutaneous Nephrostomy to Nephroureteral Catheter Conversion

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

CPT 50435: Percutaneous Nephrostomy Catheter Exchange with Image Guidance

CPT-50500-KIDNEY-WOUND-SUTURE-REPAIR

CPT 50500: Suture Repair of Kidney Wound

CPT-50520-NEPHROCUTANEOUS-PYELOCUTANEOUS-FISTULA-CLOSURE

CPT 50520: Closure of Nephrocutaneous or Pyelocutaneous Fistula

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

CPT 50525: Renal Fistula Closure, Abdominal Approach

Showing 1–10 of 12

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when reporting only the physician component of radiological supervision/interpretation separate from technical facility resources, if split billing applies.
`50`	Bilateral procedure	Use when percutaneous nephrostomy catheters are placed on both kidneys during the same operative session.
`51`	Multiple procedures	Use when another distinct procedural CPT is reported during the same session in addition to the nephrostomy placement.
`52`	Reduced services	Use when the service is partially reduced or not completed as planned (e.g., inability to obtain access to the collecting system).
`53`	Discontinued procedure	Use when the procedure is terminated after initiation for patient-related or clinical reasons.
`59`	Distinct procedural service	Use when an additional procedure not normally bundled with the nephrostomy placement is performed and meets distinct procedural criteria.
`62`	Two surgeons	Use when two physicians of different specialties perform distinct surgical portions requiring a co-surgeon arrangement.
`76`	Repeat procedure by same physician	Use when the same physician repeats the procedure later the same day.
`77`	Repeat procedure by another physician	Use when another physician repeats the procedure the same day.
`78`	Return to operating room for a related procedure after initial service	Use when the patient returns to the OR/IR suite for a related procedure during the global period (e.g., re-intervention for catheter malposition).
`79`	Unrelated procedure or service by same physician during global period	Use when an unrelated service occurs during the postoperative global period (less commonly applied to IR).
`26`	(Note: `26` already listed above)	(Duplicate removed if payer forbids duplicated modifiers.)

Taxonomy Code	Specialty	Notes
207RG0100X	Interventional Radiology	Most common specialty performing percutaneous nephrostomy placement; includes imaging guidance and catheter placement.
208800000X	Urology	Urologists may perform nephrostomy placement in operative or bedside settings for urinary diversion.
363L00000X	Diagnostic Radiology	Diagnostic radiologists with procedural privileges perform image-guided renal drainage procedures.
2080P0207X	General Surgery	General surgeons with endourology or trauma privileges may perform emergent renal drainage procedures.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`N13.6`	Pyonephrosis	Indicates infected obstructed kidney requiring urgent drainage via percutaneous nephrostomy.
`N13.2`	Hydronephrosis with ureteral stricture	Reflects obstruction of urine flow amenable to percutaneous decompression.
`N20.0`	Calculus of kidney	Kidney stones causing obstruction and necessitating nephrostomy for diversion or access.
`N13.8`	Other obstructive and reflux uropathy	Catch-all for non-specific obstructive causes requiring drainage.
`N28.9`	Disorder of kidney and ureter, unspecified	Used when specific diagnosis not yet determined but intervention is clinically indicated.
`N39.0`	Urinary tract infection, site not specified	Infection in the setting of obstruction may prompt decompression with nephrostomy.
`N11.0`	Chronic tubulo-interstitial nephritis	Chronic renal conditions complicated by obstruction and need for drainage in select cases.
`N99.99`	Data not available in the input.	Data not available in the input.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`50432`	Percutaneous nephrostomy catheter placement, initial; without imaging guidance (separate code for non-image-guided approaches)	May be reported in limited settings if access is gained without image guidance; typically not used when ultrasound/fluoroscopy is employed.
`50392`	Nephrostomy or pyelostomy placement, percutaneous, with imaging guidance (diagnostic/therapeutic) — historically used in some coding sets	Related alternative codes in older or payer-specific coding; confirms the role of imaging guidance for access and drainage.
`74450`	Radiologic examination, antegrade pyelogram (nephrostogram), including fluoroscopic guidance	Commonly performed during the procedure to delineate collecting system anatomy and level of obstruction; contrast injection and imaging documented separately if billed.
`51702`	Per urethral catheterization, single or intermittent catheterization for drainage, simple (eg, straight catheterization)	May be performed pre- or post-procedure for bladder drainage or contrast study coordination but is typically separate from nephrostomy placement.
`99500`	Infant or pediatric basic life support (if applicable)	Applicable in pediatric or special circumstances requiring documented resuscitation preparedness; included here as an occasional adjunct.

CPT 50400: Pyeloplasty for Ureteropelvic Junction Obstruction

CPT-50405-PYELOPLASTY-URETEROPELVIC-JUNCTION-RECONSTRUCTION

CPT 50405: Pyeloplasty for Ureteropelvic Junction Obstruction

CPT-50430-PERCUTANEOUS-URETEROGRAM-NEPHROSTOGRAM-DIAGNOSTIC

CPT 50430: Percutaneous Ureterogram/Nephrostogram Diagnostic Study

CPT-50431-NEPHROSTOGRAM-URETEROGRAM-CONTRAST-STUDY

CPT 50431: Nephrostogram or Ureterogram via Existing Access

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

CPT 50432: Image-Guided Percutaneous Renal Pelvis Catheter Placement

CPT-50434-PERCUTANEOUS-NEPHROSTOMY-TO-NEPHROURETERAL-CONVERSION

CPT 50434: Percutaneous Nephrostomy to Nephroureteral Catheter Conversion

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

CPT 50435: Percutaneous Nephrostomy Catheter Exchange with Image Guidance

CPT-50500-KIDNEY-WOUND-SUTURE-REPAIR

CPT 50500: Suture Repair of Kidney Wound

CPT-50520-NEPHROCUTANEOUS-PYELOCUTANEOUS-FISTULA-CLOSURE

CPT 50520: Closure of Nephrocutaneous or Pyelocutaneous Fistula

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

CPT 50525: Renal Fistula Closure, Abdominal Approach

Showing 1–10 of 12

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

OpenPayer

CPT 50433: Image-Guided Percutaneous Nephrostomy

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Billing Code Overview

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CPT 50433: Image-Guided Percutaneous Nephrostomy

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References