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    OpenPayerBilling CodesMedical Radiation Physics, Dosimetry, Treatment Devices, and Special Services for Radiation TreatmentCPT cpt-77306-radiation-therapy-beam-arrangement-dose-calculation
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    CPT 77306: Parallel Opposed External Beam Radiation Treatment Setup

    Medicare pays $104 on average nationally for this procedure.

    CPT code 77306 describes the radiation oncology service in which the provider arranges one or two parallel opposed treatment ports to establish an isodose beam arrangement for external beam radiation therapy and calculates the appropriate radiation dose based on tumor type and stage; service type: treatment planning and beam arrangement for external beam radiation therapy; typical site of service: radiation oncology department or hospital outpatient radiation therapy suite.

    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 64-year-old male with newly diagnosed stage IIIB non–small cell lung cancer (NSCLC) is referred to radiation oncology for definitive external beam radiation therapy. After consultation and review of diagnostic imaging (CT chest and PET-CT) and multidisciplinary tumor board recommendations, the radiation oncologist designs a 3D-conformal plan using two parallel opposed treatment ports to cover the primary tumor and involved mediastinal nodes while sparing adjacent normal structures. On the day of simulation and treatment planning, the physician defines beam geometry, selects beam energy, and calculates the prescription isodose and monitor units to deliver the intended dose per fraction and total dose based on tumor stage and histology. The provider documents the arrangement of one or two parallel opposed fields, the calculated dose, and clinical rationale in the radiation treatment plan. Typical clinical workflow steps include consultation, simulation (CT simulation with immobilization), treatment planning (beam arrangement and dose calculation), physics/ dosimetry checks, and delivery of daily fractions in a radiation oncology department within an outpatient hospital or freestanding radiation center. Typical site of service is an outpatient radiation oncology clinic or hospital outpatient department.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77290Therapeutic radiology simulation-aided field setting; simplePerformed during simulation to define treatment fields prior to planning with parallel opposed ports.
    772953D radiotherapy plan, complexOften follows or accompanies the work described in 77306 when 3D-conformal planning is used; includes beam arrangement and dose calculations for complex plans.
    77301Special treatment procedures, design and construction of compensators, bolus, or shieldingMay be performed when beam shaping or compensators are required in conjunction with opposed fields.
    77427Radiation treatment management, high complexity; per weekBilled during the course of radiation treatment delivery and ongoing management after planning coded by 77306.
    77336Continuing medical physics consultationMedical physics review and chart checks related to the dose calculation and treatment delivery for plans like those described in 77306.

    Related Modifiers

    10 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…
    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…
    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…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    174400000X
    106E00000X
    363L00000X
    1710I1003X
    204F00000X
    3416S0300X
    163WP0218X
    283XC2000X

    Related ICD-10-CM Codes

    26 rows

    ICD-10-CM CodeDescription
    C16.9Malignant neoplasm of stomach, unspecified
    C18.9Malignant neoplasm of colon, unspecified
    C20Malignant neoplasm of rectum
    C22.0Liver cell carcinoma
    C25.9Malignant neoplasm of pancreas, unspecified
    C33Malignant neoplasm of trachea
    C34.11Malignant neoplasm of upper lobe, right bronchus or lung
    C34.12Malignant neoplasm of upper lobe, left bronchus or lung
    C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
    C34.91Malignant neoplasm of unspecified part of right bronchus or lung

    Showing 1–10 of 26

    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-77300-RADIATION-THERAPY-DOSIMETRY

    CPT 77300: Radiation Dosimetry and Treatment Planning

    CPT-77301-INTENSITY-MODULATED-RADIOTHERAPY-IMRT-DELIVERY

    CPT 77301: Intensity-Modulated Radiotherapy (IMRT) Delivery

    CPT-77307-RADIATION-THERAPY-ISODOSE-TANGENTIAL-PORT-PLANNING

    CPT 77307: Tangential Ports and Isodose Beam Arrangement for Radiation Therapy

    CPT-77316-BRACHYTHERAPY-SIMPLE-ISODOSE-PLANNING

    CPT 77316: Simple Level Isodose Planning for Brachytherapy

    CPT-77317-INTERMEDIATE-BRACHYTHERAPY-ISODOSE-PLANNING

    CPT 77317: Intermediate Isodose Planning for Brachytherapy

    CPT-77318-INTERMEDIATE-ISODOSE-BRACHYTHERAPY-PLANNING

    CPT 77318: Brachytherapy Isodose Planning, Intermediate

    CPT-77321-ELECTRON-SPECIAL-BEAM-PLANNING-RADIATION-ONCOLOGY

    CPT 77321: Radiation Therapy Planning — Special Beam Consideration

    CPT-77331-SPECIAL-DOSIMETRY-RADIATION-DOSE-CALCULATION

    CPT 77331: Special Dosimetry and Radiation Monitoring

    CPT-77332-SIMPLE-TREATMENT-DEVICE-DESIGN-SELECTION

    CPT 77332: Simple Treatment Device Design and Selection

    CPT-77333-RADIATION-THERAPY-INTERMEDIATE-DEVICE-DESIGN

    CPT 77333: Design/Construction of Intermediate Radiation Therapy Devices

    Showing 1–10 of 14

    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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