Summary & Overview
CPT 74420: Retrograde Urography (Retrograde Pyelography)
CPT code 74420 represents a diagnostic imaging procedure—retrograde urography (retrograde pyelography)—in which contrast is introduced via catheter against normal urinary flow to visualize the ureters and renal collecting system. The code is used when clinicians need direct opacification of the upper urinary tract, commonly to investigate suspected obstruction, ureteral injury, or to define anatomy prior to intervention. Nationally, this code is relevant for facility and professional billing where fluoroscopic catheter-based imaging is required and where noninvasive modalities are inconclusive.
Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context for CPT code 74420, typical sites of service, and the procedural purpose. The publication summarizes payer coverage patterns and common billing considerations, highlights benchmark metrics and utilization context where available, and outlines policy or coding guidance impacts that affect reimbursement and claim adjudication nationally. The content is intended to clarify clinical indications and billing classification for clinicians, coders, and revenue leaders managing procedures that require catheter-directed retrograde contrast imaging of the upper urinary tract.
Billing Code Overview
CPT code 74420 describes a retrograde urography (retrograde pyelography) procedure in which a provider inserts radiopaque contrast material through a catheter against normal urinary flow to image the ureters and renal collecting system. The procedure is performed to evaluate upper urinary tract obstruction and visualize anatomic detail when antegrade contrast or noninvasive imaging is insufficient.
Service Type: Diagnostic imaging procedure involving invasive contrast administration via catheter
Typical Site of Service: Hospital radiology suite, ambulatory surgical center, or specialized imaging suite where fluoroscopy and catheterization are available
Clinical & Coding Specifications
Clinical Context
A 58-year-old male presents with flank pain, microscopic hematuria, and suspected upper urinary tract obstruction after prior imaging (renal ultrasound and CT) suggested hydronephrosis of the left kidney. The urology team schedules an operative diagnostic procedure in the fluoroscopy suite or hybrid operating room where the patient is positioned for cystoscopy. Under sterile conditions, the urologist performs cystoscopy and places a ureteral catheter retrograde into the affected ureter. Radiopaque contrast is injected against the normal flow to opacify the ureter and renal collecting system while fluoroscopic images are obtained to define the level and cause of obstruction (stone, stricture, mass) and to guide potential therapeutic maneuvers such as stent placement or stone removal. Typical site of service is an ambulatory surgical center or hospital-based operating/procedure room with fluoroscopy capability. The clinical workflow includes pre-procedure consent and antibiotic prophylaxis as indicated, cystoscopic ureteral catheterization, contrast injection with fluoroscopic imaging (retrograde pyelography), interpretation of images by the provider, and documentation of findings and any immediate interventions (e.g., retrograde stent placement). Post-procedure recovery includes monitoring for hematuria, infection, and contrast-related reactions before discharge or inpatient admission based on clinical status.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the interpreting physician’s professional component if technical component billed separately. |