HCPCS Level II code C1606 identifies a single-use, disposable adapter that connects an ultrasound system to an upper gastrointestinal endoscope for endoscopic ultrasound procedures. This device-level code matters nationally because it supports billing and supply-chain clarity for a common accessory used in diagnostic and interventional EUS, a modality increasingly important for gastrointestinal oncology, pancreatobiliary disease, and submucosal lesion evaluation.

Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical use and settings for the adapter, an outline of common modifiers applicable to device and procedure-related service lines, and notes on payer coverage patterns where available. The publication highlights benchmarks for coding practices, summarizes policy considerations relevant to hospital outpatient departments and ambulatory surgery centers, and situates C1606 within the broader EUS service line. Data not available in the input will be noted where applicable. This summary provides clinicians, billing professionals, and policy analysts a national-level reference for documenting and coding the disposable EUS adapter represented by HCPCS Level II code C1606.