Summary & Overview
CPT 77285: Radiation Therapy Simulation for Port Localization
CPT code 77285 captures simulation or imaging-based localization used to determine the size and location of ports for radiation therapy. This preparatory procedure is a critical step in radiation oncology workflows because accurate port placement and localization influence treatment accuracy, patient safety, and downstream resource use. Nationally, capture and correct billing of this service enable consistent reporting of simulation complexity and support appropriate payment for radiation planning.
Key payers in a national analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an explanation of what the code represents, typical clinical contexts where it is used, and the common payment and billing considerations associated with simulation services in radiation oncology. The publication presents benchmarks for utilization and reimbursement patterns where available, highlights relevant policy and coverage trends affecting simulation services, and provides clinical context about how port localization fits into radiation treatment planning. Data not available in the input is called out where applicable.
Billing Code Overview
CPT code 77285 describes the use of a simulator or other imaging modality to determine the size and location of ports to be used for radiation therapy. This service focuses on treatment planning steps required to position access ports or markers that guide radiation delivery.
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Service type: Radiation therapy planning/simulation
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Typical site of service: Radiation oncology department, hospital outpatient department, or freestanding radiation therapy center
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult newly diagnosed with a localized malignancy (for example, breast, lung, prostate, or head and neck cancer) referred to radiation oncology for planning of external beam radiation therapy. The patient presents to the radiation simulation suite on a scheduled day. Computed tomography (CT) simulation is performed with the patient positioned reproducibly using immobilization devices. The radiation oncologist and dosimetrist review imaging to determine the optimal size, number, and exact anatomic locations of treatment ports (field borders) or isocenters and any necessary patient markers or tattoos. When port placement requires fluoroscopic or other imaging correlation, a simulator or imaging modality is used to verify port coordinates relative to anatomic landmarks. The resulting port/field setup information is used to create the treatment plan and portals on the treatment machine and documented in the simulation and planning notes.
Typical workflow steps:
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Patient registration and consent.
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Immobilization and CT simulation (with or without contrast) while in treatment position.
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Acquisition of simulation images and, when indicated, use of an on-board simulator or fluoroscopy to localize and mark port sites.
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Attending radiation oncologist documents port size, shape, location, and any blocking or beam-modifying devices.
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Transmission of simulation data to dosimetry for treatment planning, and scheduling of subsequent treatment delivery sessions.
Coding Specifications
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