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    v1.0.30
    OpenPayerBilling CodesRadiation Treatment DeliveryCPT cpt-77402-external-beam-radiation-therapy-level-1
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    CPT 77402: External Beam Radiation Therapy, Level 1 Complexity

    Medicare pays $86 on average nationally for this procedure.

    CPT code 77402 describes delivery of external beam radiation therapy, level 1 complexity, involving single-electron fields, multiple-electron fields, or two-dimensional (2D) photon therapy where beam shaping and targeting use surface or bony landmarks; the service includes imaging guidance when performed. Service type: technical component of external beam radiation therapy, lower-complexity planning and delivery. Typical site of service: radiation oncology clinic or hospital outpatient radiation therapy department, using external beam equipment for simpler treatment setups and targeting without advanced volumetric imaging.

    For related coverage guidance, see recent payer policy updates: Radiation oncology coverage and treatment delivery guidelines, Proton Beam Therapy, Radiation and Oncologic Procedures.

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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, low‑complexity tumor such as a superficial skin malignancy, small localized breast lesion after lumpectomy, or a palliative bone metastasis where a simple external beam technique is appropriate. The patient presents to a freestanding radiation oncology clinic or hospital outpatient radiation therapy department for fractionated external beam radiation therapy delivered using single‑electron fields, multiple electron fields, or two‑dimensional photon planning based on surface or bony landmarks rather than volumetric CT‑based planning. The initial workflow includes physician evaluation, simulation using simple immobilization and planar imaging or fluoroscopy as needed, delineation of target and critical structures using 2D landmarks, generation of a basic treatment plan, and daily setup with portal or planar imaging for positioning. Treatment sessions are delivered by a radiation therapist under the supervision of the radiation oncologist; dosimetry and physics perform QA appropriate for level 1 complexity. Common scenarios include post‑operative small breast field irradiation, palliation of localized bone pain, or treatment of superficial skin cancers where advanced 3D or IMRT techniques are not required.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77261Therapeutic radiology simulation-aided field setting; simpleUsed for the simulation visit and basic field setup appropriate for level 1 complexity prior to delivery of 77402
    77300Basic radiation dosimetry procedure, calculation of dose distributionsPerformed in planning to calculate dose for simple 2D or electron fields used with 77402
    77014Computed tomography guidance for localization and/or treatment delivery, per dayIf basic CT imaging is used for setup guidance in more than planar imaging; may be billed when imaging guidance is performed with the technical delivery
    77427Radiation treatment management, weekly managementWeekly physician management service delivered during a course that includes 77402 fractions
    77499Unlisted procedure, radiation oncologyUsed when a billing scenario related to radiation delivery does not match standard codes; rarely used when complexity differs from 77402 descriptors

    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…
    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…
    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…
    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…
    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…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…
    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
    207RC0000X
    208000000X
    208600000X
    374U00000X
    163WN1003X
    2251P0200X
    133VN1101X
    207RT0003X

    Related ICD-10-CM Codes

    25 rows

    ICD-10-CM CodeDescription
    C16.9Malignant neoplasm of stomach, unspecified
    C18.9Malignant neoplasm of colon, unspecified
    C22.0Liver cell carcinoma
    C25.9Malignant neoplasm of pancreas, unspecified
    C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
    C43.9Malignant melanoma of skin, unspecified
    C44.519Basal cell carcinoma of skin of other part of trunk
    C50.912Malignant neoplasm of unspecified site of left female breast
    C61Malignant neoplasm of prostate
    C67.9Malignant neoplasm of bladder, unspecified

    Showing 1–10 of 25

    Related Payer Policy Updates

    Specialty: Radiation Oncology1 / 2

    10 rows

    PolicyPayerEffective Date
    Radiation oncology coverage and treatment delivery guidelinesevicore2026-11-05
    Proton Beam Therapyuniversityofutahhealthplans2026-10-25
    Radiation and Oncologic ProceduresUnitedHealthcare2026-09-01
    Electronic Brachytherapy for Nonmelanoma Skin CancerBluecross Idaho2026-07-30
    Surface Radiation Therapy for Treatment of Non-Melanoma Skin Cancereocco2026-07-09
    Radiofrequency Ablation of Tumors Outside the LiverProvidence Health Plan2026-07-01
    Therapeutic Radiopharmaceuticals in Oncology (Lutathera, Pluvicto, Xofigo) Coverage CriteriaBlue Cross Blue Shield - North Carolina2026-07-01
    Intensity Modulated Radiation TherapyAmbetter Georgia2026-06-01
    Irreversible Electroporation (IRE) of Tumors Other Than LiverBlue Cross Blue Shield - Rhode Island2026-06-01
    Irreversible Electroporation (IRE) — NanoKnife (Preauthorization Required)Blue Cross Blue Shield - Nebraska2026-06-01

    Related Codes

    CPT-77407-3D-CRT-IMRT-SINGLE-ISOCENTER-LEVEL-2

    CPT 77407: Radiation Therapy, Level 2 Complexity

    CPT-77412-EXTERNAL-BEAM-RADIATION-THERAPY-HIGH-COMPLEXITY

    CPT 77412: Complex External Beam Radiation Delivery

    CPT-77417-THERAPEUTIC-RADIOLOGY-PORT-FILMS

    CPT 77417: Therapeutic Radiology Port Films

    CPT-77424-INTRAOPERATIVE-RADIATION-THERAPY-TECHNICAL-COMPONENT

    CPT 77424: Intraoperative Radiation Therapy, Technical Component

    CPT-77425-INTRAOPERATIVE-ELECTRON-BEAM-RADIATION-TECHNICAL

    CPT 77425: Intraoperative Electron Beam 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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