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    v1.0.31
    OpenPayerPolicy UpdatesRadiation OncologyRegence IMRT Prior Auth Policy Coverage | OpenPaye…
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    CurrentRegence BlueCross BlueShieldPolicy M-MED167

    Intensity Modulated Radiotherapy (IMRT) for Tumors in Close Proximity to Organs at Risk

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    Medicare Advantage coverage and prior authorization for medically necessary IMRT when tumors are near organs at risk, with required clinical documentation and comparative dose/volume histogram analysis when applicable.

    Policy Summary
    PayerRegence BlueCross BlueShield
    PolicyIntensity Modulated Radiotherapy (IMRT) for Tumors in Close Proximity to Organs at Risk
    Policy CodePolicy M-MED167
    Change TypeNo material change
    Effective DateJanuary 1, 2026
    Last ReviewDec 1, 2025
    Next Review DateSeptember 1, 2026
    Key ActionSubmit all IMRT requests for review before services are rendered with the required clinical documentation.
    SourceLink
    POLICY UPDATE CHANGES

    No material clinical or coverage changes in this revision.

    2IMRT documentation pathways
    4Cross-referenced medical policies
    6Listed treatment planning and delivery codes
    3D vs IMRTComparative planning analysis

    OpenPayer is powered by Trek Health's payer performance platform. Trek continuously ingests, validates, and normalizes Transparency in Coverage data alongside payer policies and other commercial payer data to create a structured payer intelligence foundation. OpenPayer uses this foundation to deliver personalized search results, dynamically generated policy pages, and tailored policy monitoring based on each user's payers, specialties, billing codes, and areas of interest. The same intelligence powers broader payer performance workflows, including reimbursement benchmarking, contract evaluation, payer negotiations, and financial decision-making.

    Medical Necessity and Coverage Requirements

    General coverage requirement

    Covered only when medically necessary.

    IMRT medical necessity: The requested IMRT must be determined medically reasonable and necessary.

    If medical necessity is not established, both the IMRT planning phase and the actual treatment are denied.

    No-DVH analysis pathway

    No dose/volume histogram analysis is required when any of the following applies:

    ONE of

    • The request is for IMRT of the central nervous system, head, neck, or thyroid under Medicine Policy No. 164.
    • The request is for IMRT of the thorax, abdomen, pelvis, or extremities under Medicine Policy No. 165.
    • The request is for breast-cancer IMRT under Medicine Policy No. 166 for accelerated partial breast irradiation (APBI).
    • The request is for breast-cancer IMRT under Medicine Policy No. 166 when there has been prior radiation to the planned target volume.
    Physical or chart notes, relevant imaging, tumor type, and tumor location are provided for review.

    The applicable policy criteria must be met for the no-analysis pathway.

    Required DVH analysis pathway

    Dose/volume histogram analysis is required when the no-DVH pathway is not met and the request relies on IMRT to protect organs at risk.

    DVH-supported IMRT medical necessity

    • The applicable no-DVH pathway criteria are not met.
    • IMRT is being requested to meet published dose/volume constraints for organs at risk.
    • A color dose/volume histogram comparing 3D and IMRT plans is submitted.
    • A completed summary analysis demonstrates why IMRT is medically necessary and whether the relevant dose constraint can be met only with IMRT.

      Identify each organ at risk, the dose constraint, the source of the constraint, the 3D result, the IMRT result, and whether the constraint can be met only with IMRT.

    The documentation demonstrates that the relevant dose constraints are not achievable through 3D planning and supports the medical necessity of IMRT.

    Investigational or experimental services are excluded from coverage because they are not considered reasonable and necessary to treat illness or injury.

    Services that are not medically reasonable and necessary under Title XVIII of the Social Security Act, §1862(a)(1)(A), are not covered.

    IMRT that does not meet the policy’s medical necessity requirements is not covered. This noncoverage includes both the IMRT planning phase and the actual treatment.

    Treatment Planning and Delivery Codes

    CPT codesCPT
    77301Intensity modulated radiotherapy plan, including dose volume histograms for target and critical structure partial tolerance specification.
    77338Multi-leaf collimator (MLC) device(s) for intensity modulated radiation therapy (IMRT), design and construction per IMRT plan.
    77385Intensity modulated treatment delivery, including guidance and tracking if performed; simple. Not valid for Medicare purposes for physician claims; deleted 01/01/2026.
    77386Intensity modulated treatment delivery, including guidance and tracking if performed; complex. Not valid for Medicare purposes for physician claims; deleted 01/01/2026.
    HCPCS codesHCPCS
    G6015Intensity modulated treatment delivery, single or multiple fields/arcs, via narrow spatially and temporally modulated beams, binary, dynamic MLC, per treatment session. Deleted 01/01/2026.
    G6016Compensator-based beam modulation treatment delivery of inverse planned treatment using 3 or more high resolution (milled or cast) compensator, convergent beam modulated fields, per treatment session. Deleted 01/01/2026.
    Image fusion and treatment planning coding noteCPT
    77399Unlisted procedure, medical radiation physics, dosimetry and treatment devices, and special services; correct code for image fusion performed to provide enhanced delineation of target and normal critical structures. Considered part of treatment planning.

    Authorization and Documentation Requirements

    Prior Authorization

    Submit IMRT prior authorization before treatment

    Submit every IMRT request for review before services are rendered, with the required clinical documentation. When the applicable no-DVH criteria are not met, include a color comparative 3D-versus-IMRT dose/volume histogram and completed summary analysis demonstrating why IMRT is medically necessary.

    Documentation Required

    Document tumor history and location

    Submit chart notes or medical records providing the history of the condition, including the tumor type and location.

    Documentation Required

    Use the most specific supported diagnosis code

    Submit ICD-10 diagnosis code(s) coded to the highest level of specificity supported by the clinical documentation.

    Documentation Required

    Document prior conventional radiation

    When applicable, document whether the member has already received the maximum amount of radiation deliverable by conventional means.

    Documentation Required

    Submit comparative DVH and summary analysis

    When indicated, submit a color comparative 3D-versus-IMRT dose/volume histogram and completed summary analysis demonstrating that IMRT is needed to meet dose constraints not achievable through 3D planning.

    • Identify the organ at risk and dose constraint.
    • Provide the source of the constraint, 3D result, and IMRT result.
    • State whether the constraint can be met only with IMRT.
    Documentation Required

    Provide records for the no-DVH pathway

    For cases covered under the no-analysis pathway, submit physical or chart notes, relevant imaging, tumor type, and tumor location for review.

    Denial Risk

    Failure to establish medical necessity can deny all IMRT phases

    IMRT is denied when it does not meet medical necessity requirements. The denial includes both the IMRT planning phase and the actual treatment.

    Denial Risk

    Investigational or medically unnecessary services are noncovered

    Investigational or experimental services are noncovered as not reasonable and necessary to treat illness or injury. Services that are not medically reasonable and necessary under Title XVIII of the Social Security Act, §1862(a)(1)(A), are not covered.

    Denial Risk

    Submit complete supporting documentation

    Missing required clinical records, diagnosis coding, radiation history, or applicable comparative DVH and summary analysis may adversely affect the review and decision outcome.

    IMRT Overview

    Intensity-modulated radiotherapy (IMRT) is a radiation therapy technique that conforms the radiation dose closely to the targeted tumor shape. It can support higher tumor doses while minimizing toxicity to surrounding healthy tissues, particularly when a tumor is near an organ at risk.

    Key Terms

    Intensity-modulated radiotherapy (IMRT)
    DefinitionA form of radiation therapy.
    Dose targetingConforms closely to the targeted tumor shape.
    Clinical purposeAllows higher doses of radiation to be delivered while minimizing toxicity to surrounding healthy tissues.
    Dose/volume histogram (DVH)
    DefinitionA graph-based comparison of dose and volume results.
    Structures evaluatedOrgans at risk.
    Treatment plans comparedThree-dimensional (3D) and IMRT treatment plans.
    Policy Summary
    PayerRegence BlueCross BlueShield
    PolicyIntensity Modulated Radiotherapy (IMRT) for Tumors in Close Proximity to Organs at Risk
    Policy CodePolicy M-MED167
    Change TypeNo material change
    Effective DateJanuary 1, 2026
    Last ReviewDec 1, 2025
    Next Review DateSeptember 1, 2026
    Key ActionSubmit all IMRT requests for review before services are rendered with the required clinical documentation.
    SourceLink
    On This Page
    Medical Necessity and Coverage RequirementsTreatment Planning and Delivery CodesAuthorization and Documentation RequirementsIMRT OverviewKey Terms