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    OpenPayerBilling CodesMedical Radiation Physics, Dosimetry, Treatment Devices, and Special Services for Radiation TreatmentCPT cpt-77300-radiation-therapy-dosimetry
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    CPT 77300: Radiation Dosimetry and Treatment Planning

    Medicare pays $46 on average nationally for this procedure.

    CPT code 77300 describes clinical dosimetry services involving the calculation and planning of radiation dose (measured in grays, Gy) for radiotherapy treatment of cancerous tumors, including computations such as central axis depth dose, nominal standard dose, time dose factor, gap calculations, off-axis and tissue inhomogeneity factors; service type: dosimetry and radiation treatment planning; typical site of service: radiation oncology clinic or hospital-based radiation therapy department.

    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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    Clinical & Coding Specifications

    Clinical Context

    A 62-year-old patient with a newly diagnosed localized prostate adenocarcinoma presents to a multidisciplinary radiation oncology clinic for definitive external beam radiation therapy. After the consultation and staging, the radiation oncologist orders detailed dosimetry calculations to prescribe the therapeutic dose in grays (Gy), account for organ-at-risk constraints, and plan fractionation. A medical physicist and dosimetrist perform the dosimetry process, calculating central axis depth doses, tissue inhomogeneity corrections, off-axis factors, and time-dose factors (TDF) to determine monitor units and beam arrangements. Results are reviewed by the physician, documented in the radiation therapy plan, and used to set up first-day treatment. Subsequent dosimetry recalculations occur if treatment fields change, if adaptive planning is required due to anatomical changes, or if dose modification is clinically indicated.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77261Therapeutic radiology simulation-aided field setting, simplePerformed prior to dosimetry to establish treatment fields and immobilization for straightforward cases
    77263Therapeutic radiology simulation-aided field setting, complexPerformed prior to dosimetry for more complex simulation requiring 3D planning and image fusion
    77301Intensity modulated radiation treatment delivery, per dayDelivery code used during the course of therapy after dosimetry and treatment planning are completed
    77336Continuing medical physics consultation, dosimetry reviewMedical physics services for ongoing plan evaluation and quality assurance during the treatment course
    77427Radiation treatment management, 5 treatmentsPhysician management code used periodically during a fractionated course of radiation therapy following dosimetry and initiation of treatment

    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…
    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…
    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…
    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…
    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…
    95Modifier 95 indicates that a service was provided via synchronous, real‑time audio‑video telehealth rather than in‑person. Per CMS, AAPC and professional associations, append modifier 95 to claim…- Use modifier 95 to indicate a service was furnished via synchronous, real‑time audiovisual telehealth (a live audio‑video conference between patient and provider) rather than in‑person. - Pair…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    2086S0122X
    363L00000X
    246QC1000X
    163WM0102X
    2085R0203X
    225100000X
    235500000X
    261QP2000X

    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-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-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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