CPT code 51600 represents a voiding cystourethrogram (VCUG), a fluoroscopic diagnostic test that images the bladder and urethra during urination to detect vesicoureteral reflux and other lower urinary tract abnormalities. This procedure is widely used in pediatric and adult urologic evaluation and is performed in hospital radiology departments or outpatient imaging suites. Nationally, accurate coding and coverage determinations for CPT code 51600 affect utilization, care pathways, and imaging access for urinary tract diagnosis. Key payers reviewed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and the payer landscape addressed in the analysis. The publication outlines coverage considerations, common billing modifiers encountered, and where to expect variation across payers. It also presents benchmarking and coding practice notes to inform revenue cycle and clinical teams. Data not available in the input is noted where specifics are missing.