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CPT 50436: Dilation of Percutaneous Nephrostomy Tract, With Possible Tube Placement

CPT code 50436 represents dilation of an existing percutaneous nephrostomy tract, often performed by interventional radiologists to restore or maintain access between the renal collecting system and the skin. The procedure can include placement of a drainage tube and covers imaging guidance plus radiologic supervision and interpretation when provided. Nationally, this code captures an image-guided, minimally invasive service used for renal drainage, access maintenance, and management of urinary obstruction or catheter dysfunction.

Key payers examined include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for use of CPT code 50436, common care settings where the service is delivered, and operational considerations for billing and documentation. The publication also summarizes benchmarking data and typical payer coverage themes, outlines common modifiers reported with the procedure, and highlights relevant coding and reporting considerations for radiology supervision and image guidance.

This summary is intended for national audiences including coding professionals, revenue cycle managers, and clinical leaders seeking concise guidance on the clinical and administrative characteristics of CPT code 50436. Data not available in the input for specific payer rates, detailed policy edits, associated taxonomies, and ICD-10 mappings are noted where applicable.

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Billing Code Overview

CPT code 50436 describes dilation of an existing percutaneous nephrostomy tract, an artificial pathway between the kidney or renal pelvis and the skin. The procedure may include placement of a tube after dilation to maintain tract patency. The code includes any imaging guidance and radiologic supervision and interpretation when those services are performed.

Service type: Interventional radiology procedure involving tract dilation and potential tube placement
Typical site of service: Hospital outpatient department, ambulatory surgery center, or interventional radiology suite

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CPT 50436: Dilation of Percutaneous Nephrostomy Tract, With Possible Tube Placement

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Billing Code Overview

Service type: Interventional radiology procedure involving tract dilation and potential tube placement
Typical site of service: Hospital outpatient department, ambulatory surgery center, or interventional radiology suite

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult with an established percutaneous nephrostomy tube placed previously for urinary obstruction from ureteral calculi, malignancy, or stricture. The patient presents with a chronically narrowed or matured nephrostomy tract that requires controlled dilation to allow catheter exchange, upsizing, or improved drainage. The clinical workflow begins with pre-procedure assessment (history, coagulation status, informed consent), review of recent imaging, and placement in an interventional radiology suite or fluoroscopy-capable procedure room. Under conscious sedation or monitored anesthesia care, the interventional radiologist uses sterile technique and fluoroscopic guidance to access the existing tract, perform stepwise dilation with dilators or balloon dilatation, and may place a replacement or larger nephrostomy tube. Radilogic supervision and interpretation, cross-sectional or fluoroscopic imaging for guidance, and post-procedure imaging to confirm position and drainage are included. Typical post-procedure steps include monitoring for bleeding, infection, and ensuring urine output via the tube before discharge or admission for further care.

Coding Specifications

Modifier	Description	When to Use
`11`	Normal, postoperative or recovery care	Use when billing reflects a service performed during routine postoperative period if applicable per payer rules
`22`	Increased procedural services	Use when the dilation required substantially greater work than typical due to complexity, documented in the record
`52`	Reduced services	Use when the procedure was partially reduced or not completed as planned
`53`	Discontinued procedure	Use when the procedure was started but terminated due to patient condition or complication
`59`	Distinct procedural service	Use when another separate radiologic or procedural service was performed on a different site or at a separate session
`62`	Two surgeons	Use when two surgeons of different specialties worked together as primary surgeons
`66`	Surgical team (professional component)	Use when services are provided by a surgical team as defined by payer
`73`	Discontinued outpatient procedure prior to anesthesia	Use when the outpatient procedure was discontinued before anesthesia/analgesia was administered
`78`	Return to operating/procedure room for a related procedure during the postoperative period	Use when a related unplanned procedure for complications is performed during the global period
`79`	Unrelated procedure or service by the same physician during the postoperative period	Use when an unrelated procedure is performed during the global period

Taxonomy Code	Specialty	Notes
363A00000X	Interventional Radiology	Primary specialty performing nephrostomy tract dilation and tube exchanges
208800000X	Diagnostic Radiology	Radiologists who provide imaging guidance and interpretation
207L00000X	Urology	Urologists who may participate in tract management and decision-making
207P00000X	Surgery (General)	Surgeons who may be involved when surgical input is required
3336C0008X	Anesthesiology	Providers of monitored anesthesia care or sedation for the procedure

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`N13.2`	Hydronephrosis with renal and ureteral calculous obstruction	Obstruction can require nephrostomy drainage and subsequent tract dilation for tube management
`N13.6`	Pyonephrosis	Infected obstructed collecting system may require drainage and tube upsizing or exchange via tract dilation
`N28.0`	Renal insufficiency, unspecified	Patients with impaired drainage and renal compromise may require nephrostomy tract interventions
`N28.9`	Disorder of kidney and ureter, unspecified	Used when specific diagnosis is not otherwise classified but intervention is required
`C64.9`	Malignant neoplasm of kidney, unspecified	Malignancy-caused obstruction may necessitate nephrostomy placement and later tract dilation for maintenance
`K83.1`	Obstruction of bile duct (example of non-urinary obstruction)	Data not applicable — Data not available in the input.
`N20.0`	Calculus of kidney	Nephrolithiasis causing obstruction can lead to nephrostomy and need for tract dilation

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`50436`	Dilation of existing percutaneous nephrostomy tract; may leave tube in place (includes imaging guidance and RSI)	Primary procedure described — dilation of an established nephrostomy tract with possible tube placement
`50390`	Exchange or removal of percutaneous nephrostomy tube without imaging guidance	Performed when only catheter exchange is required without tract dilation or imaging supervision
`50392`	Replacement or repositioning of percutaneous nephrostomy tube with imaging guidance	Commonly performed alongside or after dilation when a new or upsized tube is placed under fluoroscopic guidance
`50432`	Initial placement of percutaneous nephrostomy tube, including imaging guidance and RSI	Performed when a new tract must be created rather than dilating an existing tract
`76937`	Ultrasound guidance for needle placement (real-time)	May be used adjunctively for initial access or localization during nephrostomy procedures
`77012`	CT guidance for needle placement	May be used when CT guidance is required for complex anatomy or difficult access

CPT 50390: Renal Cyst Aspiration with Sclerotherapy

CPT-50391-THERAPEUTIC-INSTILLATION-RENAL-PELVIS-URETER

CPT 50391: Therapeutic Instillation into Renal Pelvis or Ureter

CPT-50396-URETERAL-NEPHROSTOMY-PYELOSTOMY-PRESSURE-MEASUREMENT

CPT 50396: Ureteral/Nephrostomy/Pyelostomy Pressure Measurement

CPT-50437-PERCUTANEOUS-NEPHROSTOMY-TRACT-DILATION-AND-CREATION

CPT 50437: Percutaneous Nephrostomy Tract Dilation with New Tract Creation

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.

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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
`11`	Normal, postoperative or recovery care	Use when billing reflects a service performed during routine postoperative period if applicable per payer rules
`22`	Increased procedural services	Use when the dilation required substantially greater work than typical due to complexity, documented in the record
`52`	Reduced services	Use when the procedure was partially reduced or not completed as planned
`53`	Discontinued procedure	Use when the procedure was started but terminated due to patient condition or complication
`59`	Distinct procedural service	Use when another separate radiologic or procedural service was performed on a different site or at a separate session
`62`	Two surgeons	Use when two surgeons of different specialties worked together as primary surgeons
`66`	Surgical team (professional component)	Use when services are provided by a surgical team as defined by payer
`73`	Discontinued outpatient procedure prior to anesthesia	Use when the outpatient procedure was discontinued before anesthesia/analgesia was administered
`78`	Return to operating/procedure room for a related procedure during the postoperative period	Use when a related unplanned procedure for complications is performed during the global period
`79`	Unrelated procedure or service by the same physician during the postoperative period	Use when an unrelated procedure is performed during the global period

Taxonomy Code	Specialty	Notes
363A00000X	Interventional Radiology	Primary specialty performing nephrostomy tract dilation and tube exchanges
208800000X	Diagnostic Radiology	Radiologists who provide imaging guidance and interpretation
207L00000X	Urology	Urologists who may participate in tract management and decision-making
207P00000X	Surgery (General)	Surgeons who may be involved when surgical input is required
3336C0008X	Anesthesiology	Providers of monitored anesthesia care or sedation for the procedure

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`N13.2`	Hydronephrosis with renal and ureteral calculous obstruction	Obstruction can require nephrostomy drainage and subsequent tract dilation for tube management
`N13.6`	Pyonephrosis	Infected obstructed collecting system may require drainage and tube upsizing or exchange via tract dilation
`N28.0`	Renal insufficiency, unspecified	Patients with impaired drainage and renal compromise may require nephrostomy tract interventions
`N28.9`	Disorder of kidney and ureter, unspecified	Used when specific diagnosis is not otherwise classified but intervention is required
`C64.9`	Malignant neoplasm of kidney, unspecified	Malignancy-caused obstruction may necessitate nephrostomy placement and later tract dilation for maintenance
`K83.1`	Obstruction of bile duct (example of non-urinary obstruction)	Data not applicable — Data not available in the input.
`N20.0`	Calculus of kidney	Nephrolithiasis causing obstruction can lead to nephrostomy and need for tract dilation

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`50436`	Dilation of existing percutaneous nephrostomy tract; may leave tube in place (includes imaging guidance and RSI)	Primary procedure described — dilation of an established nephrostomy tract with possible tube placement
`50390`	Exchange or removal of percutaneous nephrostomy tube without imaging guidance	Performed when only catheter exchange is required without tract dilation or imaging supervision
`50392`	Replacement or repositioning of percutaneous nephrostomy tube with imaging guidance	Commonly performed alongside or after dilation when a new or upsized tube is placed under fluoroscopic guidance
`50432`	Initial placement of percutaneous nephrostomy tube, including imaging guidance and RSI	Performed when a new tract must be created rather than dilating an existing tract
`76937`	Ultrasound guidance for needle placement (real-time)	May be used adjunctively for initial access or localization during nephrostomy procedures
`77012`	CT guidance for needle placement	May be used when CT guidance is required for complex anatomy or difficult access

CPT 50390: Renal Cyst Aspiration with Sclerotherapy

CPT-50391-THERAPEUTIC-INSTILLATION-RENAL-PELVIS-URETER

CPT 50391: Therapeutic Instillation into Renal Pelvis or Ureter

CPT-50396-URETERAL-NEPHROSTOMY-PYELOSTOMY-PRESSURE-MEASUREMENT

CPT 50396: Ureteral/Nephrostomy/Pyelostomy Pressure Measurement

CPT-50437-PERCUTANEOUS-NEPHROSTOMY-TRACT-DILATION-AND-CREATION

CPT 50437: Percutaneous Nephrostomy Tract Dilation with New Tract Creation

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 50436: Dilation of Percutaneous Nephrostomy Tract, With Possible Tube Placement

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Billing Code Overview

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CPT 50436: Dilation of Percutaneous Nephrostomy Tract, With Possible Tube Placement

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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