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    v1.0.30
    OpenPayerBilling CodesProton Beam Radiation Treatment DeliveryCPT cpt-77525-complex-proton-beam-radiation-therapy-technical
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    CPT 77525: Proton Beam Radiation Therapy, Technical Component

    CPT code 77525 describes the technical component of complex proton beam radiation therapy used to irradiate cancerous tissue, involving treatment of one or more target areas with two or more ports per area, multiple isocenters or abutting patch fields, and multiple custom blocks and compensators; service type: complex external beam radiation therapy (proton therapy) technical component; typical site of service: hospital outpatient radiation oncology department or freestanding proton therapy center.

    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 with a localized solid tumor (for example, a skull base chordoma or a pediatric medulloblastoma) referred to a proton therapy center for definitive or adjuvant radiation. The patient undergoes consultation with a radiation oncologist and multidisciplinary review, followed by CT simulation with immobilization devices and MRI fusion for target delineation. A proton physics team and dosimetrist generate a complex treatment plan using multiple fields/ports, multiple isocenters or abutting patch fields, and custom compensators/blocks. The technical delivery visit billed with 77525 involves machine setup, verification imaging, beam delivery using proton therapy equipment, and documentation of fractions delivered. Typical site of service is an outpatient radiation oncology center or hospital-based proton therapy center. Treatment is delivered over multiple fractions with daily image guidance and periodic physics checks; coordination with anesthesia may be required for pediatric or claustrophobic patients.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77301Special dosimetry, treatment devices, and planning for radiation therapy simulation and dosimetry (per course)Often performed prior to proton delivery for complex individualized dosimetry and compensator design.
    77263Therapeutic radiology simulation-aided field setting or localization of radiation source (complex)Used during CT/MRI simulation and localization processes supporting complex multi-isocenter proton plans.
    77336Continuing medical physics consultation, including assessment of treatment delivery and review of patient records (weekly)Encapsulates weekly physics review and quality assurance during a multi‑fraction proton course.
    77370Special treatment procedures, such as proton beam radiation (per treatment course technical or professional components vary)Represents ancillary special procedures often associated with proton delivery workflows.
    99213Office or other outpatient visit for evaluation and managementExample of an E/M visit for on-treatment assessment or management during the radiation course.

    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…
    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…
    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…
    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…
    24Modifier 24 denotes an unrelated evaluation and management (E/M) service performed by the same physician or qualified healthcare professional during a postoperative global period. Per CPT guidance,…- Use modifier 24 when you report an evaluation and management (E/M) service performed by the same physician or same-specialty group during a procedure’s postoperative global period that is unrelated…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    208000000X
    174400000X
    163WS0200X
    207RA0001X
    1835P0018X
    261QS0132X
    2279P3800X
    2081P0301X

    Related ICD-10-CM Codes

    21 rows

    ICD-10-CM CodeDescription
    C11.9Malignant neoplasm of nasopharynx, unspecified
    C20Malignant neoplasm of rectum
    C22.0Liver cell carcinoma
    C25.9Malignant neoplasm of pancreas, unspecified
    C30.0Malignant neoplasm of nasal cavity
    C32.9Malignant neoplasm of larynx, unspecified
    C33Malignant neoplasm of trachea
    C43.9Malignant melanoma of skin, unspecified
    C44.90Unspecified malignant neoplasm of skin, unspecified
    C50.911Malignant neoplasm of unspecified site of right female breast

    Showing 1–10 of 21

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

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

    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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