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    OpenPayerBilling CodesProton Beam Radiation Treatment DeliveryCPT cpt-77520-proton-beam-radiation-technical-simple-technique
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    CPT 77520: Proton Beam Radiation Therapy, Technical Component

    CPT code 77520 describes the technical component of simple proton beam radiation therapy delivered with a single non‑tangential port and without compensators; the service is a radiation therapy procedure performed by the radiation technologist/therapy department and is typically provided in an outpatient radiation oncology department or hospital outpatient clinic using a proton beam to irradiate a cancer target.

    For related coverage guidance, see recent payer policy updates: Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM), Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®), Lumbar Microdiscectomy.

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult with a localized solid tumor (for example, a skull-base chordoma or a localized prostate cancer treated with proton therapy) referred by a radiation oncologist for definitive or adjuvant proton beam therapy. The patient completes simulation (CT and, when indicated, MRI fusion) in the radiation oncology department; immobilization devices are fabricated; treatment planning is completed by the dosimetry team using a single, non‑tangential field without compensators; and daily setup verification is performed prior to each treatment fraction. The technical component represented by 77520 covers delivery of a simple proton beam treatment using a single port. Typical workflow steps include: initial consultation and staging, simulation and immobilization, treatment planning (dosimetry and physics review), daily machine setup and delivery by radiation therapists, routine on‑treatment assessments by the radiation oncology team, and periodic physics quality assurance checks on the proton delivery system. Typical site of service is an outpatient hospital-based radiation oncology department or freestanding proton therapy center.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77300Basic radiation dosimetry calculation, central axis depth dose and point dose calculationUsed during treatment planning to calculate dose distributions that inform the proton beam parameters prior to delivery
    77301Special dosimetry, proton/particle beam treatment plan verificationPerformed for proton and particle therapies to verify the accuracy of the treatment plan and beam modeling prior to or during the course of 77520 treatments
    77290Therapeutic radiology simulation-aided field setting; simple or complex simulation proceduresSimulation and field setup procedures (CT simulation, immobilization) that precede planning and delivery of proton therapy
    77401Radiation therapy management, simple, per weekWeekly management of the patient during a course of radiation therapy; used concurrently during the course when 77520 is being delivered
    77336Continuing medical physics consultation, when performedOngoing physics support and chart checks during the course of proton therapy to ensure accuracy and safety of delivered doses

    Related Modifiers

    8 rows

    ModifierDescriptionWhen to Use
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    208VP0000X
    2084P0800X
    207RG0100X
    2085P0229X
    163WP0218X
    374T00000X
    213EG0000X
    363LF0000X

    Related Payer Policy Updates

    Specialty: Neurology/Neurosurgery1 / 3

    10 rows

    PolicyPayerEffective Date
    Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM)Kaiser Permanente2027-01-01
    Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®)bcbsvermont2026-11-01
    Lumbar Microdiscectomyuniverahealthcare2026-10-15
    Artificial Cervical Intervertebral Discuniverahealthcare2026-10-15
    Lumbar Decompressionuniverahealthcare2026-10-15
    Responsive Neurostimulation for Focal EpilepsyPremera Bluecross2026-10-14
    Intraoperative MonitoringProvidence Health Plan2026-10-01
    Intraoperative MonitoringProvidence Health Plan2026-10-01
    High-Intensity Focused UltrasoundMass General Brigham Health Plan2026-10-01
    Vagal Nerve StimulationAmbetter Nevada2026-10-01

    Related Codes

    CPT-77522-PROTON-BEAM-THERAPY-TECHNICAL-SINGLE-PORT

    CPT 77522: Proton Beam Therapy, Technical Component (Simple, Single Port)

    CPT-77523-PROTON-BEAM-RADIATION-THERAPY-TECHNICAL-INTERMEDIATE

    CPT 77523: Proton Beam Radiation Therapy, Technical Component (Intermediate)

    CPT-77525-COMPLEX-PROTON-BEAM-RADIATION-THERAPY-TECHNICAL

    CPT 77525: Proton Beam Radiation Therapy, Technical Component

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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