CPT code 51800 represents open plastic surgical repair of defects or obstructions involving the bladder, vesical neck, and urethra, and may include partial removal of the posterior bladder neck. This procedure addresses structural causes of urinary obstruction or anatomic defects and is performed by urologic and reconstructive surgeons. Nationally, accurate coding of 51800 matters for clinical documentation, surgical quality measurement, and appropriate hospital and facility billing for operative urologic care. Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical scope, typical sites of service, and the service type, along with the common modifiers associated with surgical procedures. The publication also summarizes payer coverage patterns and benchmarking context where available, highlights clinical contexts in which 51800 is used, and notes where input data are not available. This resource is intended for coding professionals, revenue cycle managers, and clinical leaders seeking a national-level reference for coding and classification of bladder and vesical neck reconstructive procedures.