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CPT 77523: Proton Beam Radiation Therapy, Technical Component, Intermediate
CPT code 77523 represents the technical component of intermediate-complexity proton beam radiation therapy using custom blocks and compensators to treat one or more sites with two or more ports or tangential ports. As proton therapy grows in availability, accurate reporting of the technical component is important for care coordination, billing integrity, and national payment benchmarking. This code captures facility-based delivery tasks such as beam delivery, machine setup, and necessary physics and technical services associated with proton irradiation.
Key payers addressed in this national overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of what the code represents clinically and operationally, typical sites of service, and the role of the technical component in proton therapy workflows. The publication also provides benchmarks and payer coverage context where available, summarizes common billing modifiers and coding considerations, and outlines clinical context relevant to proton beam use. Data not available in the input is identified where applicable.
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Billing Code Overview
CPT code 77523 describes the technical component of proton beam radiation therapy, delivered at an intermediate complexity level. The procedure involves irradiating one or more treatment sites using two or more ports or one or more tangential ports and employs custom blocks and compensators to shape and modulate the proton beam.
Service type: Radiation therapy — proton beam (technical component), intermediate complexity
Typical site of service: Hospital outpatient radiation oncology department or freestanding proton therapy center