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    OpenPayerBilling CodesProton Beam Radiation Treatment DeliveryCPT cpt-77523-proton-beam-radiation-therapy-technical-intermediate
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    CPT 77523: Proton Beam Radiation Therapy, Technical Component (Intermediate)

    CPT code 77523 describes the technical component of intermediate proton beam radiation therapy, in which the provider delivers proton beam irradiation to treat cancer involving one or more treatment areas using two or more ports or tangential ports with custom blocks and compensators; service type: external beam proton radiation therapy (technical component); typical site of service: hospital outpatient department, freestanding radiation oncology center, or proton therapy facility.

    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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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult diagnosed with a localized malignancy (for example, a base of skull chordoma or paraspinal sarcoma) where proton beam therapy offers dosimetric advantages to spare adjacent critical structures. The patient presents to a multidisciplinary radiation oncology clinic after staging and surgical consultation. A radiation oncologist prescribes an intermediate course of proton therapy targeting one or more contiguous treatment areas. The technical team performs CT simulation with immobilization devices and acquires planning images; medical physicists create custom compensators and blocks; dosimetrists generate a treatment plan using two or more beam ports or tangential ports; and radiation therapists deliver daily fractions in the proton treatment vault. Typical workflow steps: imaging and simulation appointment; treatment planning and quality assurance including device fabrication; initial treatment setup and verification; daily treatment delivery (technical component billed under 77523); periodic on-treatment visits documented by the physician (professional component). Typical site of service is a hospital-based or freestanding proton therapy center with specialized proton beam equipment.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77301Intensity modulated radiation treatment delivery (IMRT), complex; simple or intermediate device management and beam delivery verificationUsed for daily dose delivery QA and may be billed for advanced photon IMRT workflows when photon alternatives are used or for complementary services in planning/verification
    77263Therapeutic radiology simulation-aided field setting; complex during course of therapySimulation services and field setup that precede proton treatment delivery
    77336Continuing medical physics consultation, including dose calculations, special calculations and treatment plan reviewMedical physics services and plan QA performed for proton plans and device fabrication
    77370Special medical radiation physics consultation, dosimetry reviewAdditional physics consultation for complex proton treatments or re-planning
    77014Computed tomography guidance for stereotactic procedures; initial or subsequent localizationCT localization and image guidance used during simulation and setup prior to proton delivery

    Related Modifiers

    9 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…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    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…
    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…
    63Modifier‑63 is appended to surgical CPT codes (20000–69990) when a procedure is performed on a neonate or infant weighing ≤ 4 kg (about 8.8 lbs). The AMA/AAPC definition specifies this use and notes…- Use modifier -63 only for surgical procedures in the CPT 20000–69990 series performed on a neonate or infant who weighs ≤ 4 kg at the time of the procedure; it indicates increased complexity due to…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207P00000X
    208000000X
    207QH0002X
    163WW0000X
    335U00000X
    163WH0200X
    207RA0000X
    207ZP0105X

    Related ICD-10-CM Codes

    25 rows

    ICD-10-CM CodeDescription
    C15.9Malignant neoplasm of esophagus, unspecified
    C16.9Malignant neoplasm of stomach, unspecified
    C18.9Malignant neoplasm of colon, unspecified
    C20Malignant neoplasm of rectum
    C25.9Malignant neoplasm of pancreas, unspecified
    C30.0Malignant neoplasm of nasal cavity
    C32.9Malignant neoplasm of larynx, unspecified
    C33Malignant neoplasm of trachea
    C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
    C43.9Malignant melanoma of skin, unspecified

    Showing 1–10 of 25

    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-77520-PROTON-BEAM-RADIATION-TECHNICAL-SIMPLE-TECHNIQUE

    CPT 77520: Proton Beam Radiation Therapy, Technical Component

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

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

    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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