HCPCS Level II code C2699 identifies a single non-stranded brachytherapy radioactive source supplied for use in internal radiation therapy. Brachytherapy sources are central to localized cancer treatments and procedural cost accounting because each source is billed per unit. Nationally, proper coding of these supply items affects facility billing, inventory tracking, and aggregate spend on radiation oncology supplies.

Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of what the code represents, typical sites of service where the supplies are used, and the clinical context of brachytherapy source utilization. The publication also summarizes benchmarking and payer coverage patterns, relevant billing modifiers, and coding considerations that influence claim processing. Where available, benchmarks show supply-level unit pricing and common payer edits; where payer-specific detail is not provided, the text notes that input data are not available.

This resource is intended for billing professionals, revenue cycle managers, and clinical administrators seeking a national perspective on how a non-stranded brachytherapy source is represented in claims and payer communications.