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    OpenPayerBilling CodesMedical Radiation Physics, Dosimetry, Treatment Devices, and Special Services for Radiation TreatmentCPT cpt-77307-radiation-therapy-isodose-tangential-port-planning
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    CPT 77307: Tangential Ports and Isodose Beam Arrangement for Radiation Therapy

    Medicare pays $201 on average nationally for this procedure.

    CPT code 77307 describes the planning and arrangement of tangential ports to achieve an isodose beam arrangement for external beam radiation therapy, including calculation of appropriate radiation dose based on tumor type and stage; service type: radiation therapy treatment planning for multiple simultaneous treatment areas; typical site of service: radiation oncology department or hospital-based 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 62-year-old patient with multifocal cutaneous squamous cell carcinoma of the chest and adjacent axillary nodal involvement is referred for external beam radiation therapy. The radiation oncologist evaluates prior imaging and pathology, determines that simultaneous treatment of separate target areas is appropriate, and prescribes tangential beam arrangements with matched isodose patterns to cover both the chest wall and nodal basin. The clinical workflow includes simulation (CT-based treatment planning), contouring of targets and organs at risk, dosimetric calculations to achieve equal-intensity isodose coverage across fields, creation of tangential ports and beam arrangements, physics verification, and finally delivery of fractionated external beam therapy. Documentation in the medical record includes diagnosis, treatment intent, detailed planning parameters, calculated dose per fraction and total dose, and sign-off by the treating radiation oncologist. Billing uses 77307 to report the provider’s work arranging tangential ports and calculating the appropriate dose for simultaneous treatment of multiple areas.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77261Therapeutic radiology simulation-aided field settings, simpleSimulation that often precedes planning and port arrangement for 77307
    77262Therapeutic radiology simulation-aided field settings, intermediateUsed when simulation complexity is greater and supports the treatment planning used in 77307
    77263Therapeutic radiology simulation-aided field settings, complexComplex simulation for multi-target, multi-field plans that complements 77307
    77301Intensity modulated radiation treatment planning, including dose-volume histogramsAlternative or adjunct planning code when advanced IMRT planning is performed alongside tangential port arrangement
    77336Continuing medical physics consultation, assessment, and technical directionPhysicist involvement that supports the dosimetry and verification elements related to 77307
    77401Radiation treatment delivery, simple; teletherapy, single fieldRepresents actual delivery sessions following planning with 77307

    Related Modifiers

    13 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…
    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…
    79Modifier 79 indicates a surgical procedure performed during the postoperative global period of a prior surgery that is unrelated to the original procedure. Per AMA/CPT and CMS guidance, it is…- Use modifier 79 when the same physician (or same‑specialty physician in the same group) performs a surgical procedure during the postoperative global period of a prior surgery and the new procedure…
    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…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    56Modifier ‑56 indicates the reporting provider furnished only the preoperative management for a surgical procedure and did not perform the intraoperative or postoperative care. It is used in…- Use Modifier -56 when a provider performs only the preoperative management in a split‑care situation (one physician manages preop care while a different physician performs the intraoperative…

    Showing 1–10 of 13

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RH0000X
    208100000X
    207Q00000X
    2471N0900X
    111NT0100X
    103TP2701X
    103TH0100X
    246ZG0701X

    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-77306-RADIATION-THERAPY-BEAM-ARRANGEMENT-DOSE-CALCULATION

    CPT 77306: Parallel Opposed External Beam Radiation Treatment Setup

    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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