CPT code 77770 denotes single-channel brachytherapy catheter placement for interstitial or intracavitary tumor treatment and includes dose calculation when performed. This procedure is a targeted radiation delivery technique used in oncology to deliver high doses of radiation directly to tumor beds while limiting exposure to surrounding tissues. Nationally, the code matters because it captures a specialized radiation oncology service that can impact facility service mix, payer coverage policies, and patient access to localized cancer therapies.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for single-channel brachytherapy, typical sites of service, and the procedural elements captured by the code. The publication summarizes common billing considerations, reimbursement benchmarks where available, and recent policy or coding guidance relevant to facilities and radiation oncology providers.

This material equips billing, coding, and clinical staff with the operational understanding of what CPT code 77770 represents, the settings in which it is typically performed, and the payer landscape that affects coverage and payment practices. Data not available in the input is clearly noted where applicable.