CPT code 51100 represents percutaneous bladder aspiration, a brief procedure performed to obtain urine for diagnostic testing or to provide temporary relief from acute urinary retention. The procedure is clinically important because it provides rapid decompression of the bladder and a sterile urine sample when catheterization is not feasible or is contraindicated. Nationally, this code is relevant across emergency, outpatient, and inpatient settings where urgent bladder access is required.

Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for bladder aspiration, expected sites of service, and how this service is categorized for billing purposes. The publication also outlines common billing modifiers and payer considerations when available, benchmarks for utilization where provided, and policy or coding clarifications that affect national billing practices.

This summary provides a practical reference for clinical administrators, coding professionals, and policy analysts seeking clarity on the use and classification of CPT code 51100, its clinical role in acute urinary retention and diagnostic sampling, and the payer landscape relevant to national billing and reimbursement discussions.