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    OpenPayerPolicy UpdatesRadiation OncologyRegence IMRT Prior Auth Policy Update | OpenPayer
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    CurrentRegence BlueCross BlueShieldPolicy M-MED165

    Intensity Modulated Radiotherapy (IMRT) of the Thorax, Abdomen, Pelvis, and Extremities

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    This Medicare Advantage policy governs coverage and prior authorization for IMRT of tumors in the thorax, abdomen, pelvis, and extremities. Coverage requires medical necessity, required clinical documentation, and comparative 3D-versus-IMRT dose/volume analysis when indicated.

    Policy Summary
    PayerRegence BlueCross BlueShield
    PolicyIntensity Modulated Radiotherapy (IMRT) of the Thorax, Abdomen, Pelvis, and Extremities
    Policy CodePolicy M-MED165
    Change TypeNo material change
    Effective Date01/01/2026
    Last ReviewDec 1, 2025
    Next Review Date09/01/2026
    Key ActionSubmit all IMRT requests for review before services are rendered, with required clinical records and comparative DVH analysis when indicated.
    SourceLink
    POLICY UPDATE CHANGES

    No material clinical or coverage changes in this revision.

    Prior authUtilization management
    2Planning approaches
    5DVH summary fields
    No LCDLCD coverage basis

    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.

    77385/77386Medicare physician claim codes

    Coverage Criteria

    Medical necessity

    Covered only when medical necessity is established.

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

    The planning phase is used to determine whether IMRT is medically reasonable and necessary. If medical necessity is not established, both the planning phase and the actual treatment are denied.

    Planning and dose-analysis requirements

    Submit the documentation required for the applicable planning pathway.

    Documentation pathway

    • No-DVH pathway: When the applicable policy criteria are met, submit physical or chart notes, relevant imaging, tumor type, and tumor location.

      These cases may receive auto-approval in the electronic authorization tool.

    • DVH pathway: When the applicable policy criteria are not met, or when the policy for IMRT for tumors in close proximity to organs at risk applies, 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.

      The summary analysis must identify each organ at risk, dose constraint, source of the constraint, 3D result, IMRT result, and whether the constraint can be met only with IMRT.

    Investigational or experimental services that lack scientific evidence regarding safety and efficacy are noncovered because they are not considered reasonable and necessary to treat illness or injury.

    IMRT that does not meet medical necessity requirements is not covered. The denial applies to both the IMRT planning phase and the actual treatment.

    Coding and Billing

    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).
    Additional coding noteCPT
    77399Unlisted procedure, medical radiation physics, dosimetry and treatment devices, and special services; used for image fusion performed to provide enhanced delineation of target and normal critical structures. The code is considered part of the treatment planning.

    Authorization and Documentation Requirements

    Prior Authorization

    Prior Authorization Required

    All IMRT requests require prior authorization and must be submitted for review before services are rendered. Include sufficient documentation for the plan to determine whether policy criteria are met.

    • Submit the request before the IMRT planning phase or treatment begins.
    • The plan may require review of the planning phase before authorizing actual treatment.
    Documentation Required

    Clinical Records Required

    Submit chart notes or medical records documenting the member’s condition, including the tumor type and tumor location.

    • Include relevant history of the condition.
    • Document the tumor type and location.

    Clinical Background

    Intensity modulated radiotherapy (IMRT) is a radiation therapy technique that conforms closely to the targeted tumor shape. By shaping treatment to the tumor, IMRT can deliver higher radiation doses while minimizing toxicity to surrounding healthy tissues. This policy addresses IMRT for tumors in the thorax, abdomen, pelvis, and extremities when treatment is medically reasonable and necessary.

    Key Definitions

    Intensity modulated radiotherapy (IMRT)
    Therapy typeA form of radiation therapy.
    Tumor conformityConforms closely to the targeted tumor shape.
    Dose and tissue effectsAllows higher doses of radiation to be delivered while minimizing toxicity to surrounding healthy tissues.
    Comparative dose/volume histogram (DVH) analysis
    Planning comparisonCompares 3D planning results with IMRT results.
    Organs evaluatedIdentifies each organ at risk.
    Dose constraint
    Policy Summary
    PayerRegence BlueCross BlueShield
    PolicyIntensity Modulated Radiotherapy (IMRT) of the Thorax, Abdomen, Pelvis, and Extremities
    Policy CodePolicy M-MED165
    Change TypeNo material change
    Effective Date01/01/2026
    Last ReviewDec 1, 2025
    Next Review Date09/01/2026
    Key ActionSubmit all IMRT requests for review before services are rendered, with required clinical records and comparative DVH analysis when indicated.
    SourceLink
    On This Page
    Coverage CriteriaCoding and BillingAuthorization and Documentation RequirementsClinical BackgroundKey Definitions
    Billing Rule

    Diagnosis Coding

    Submit ICD-10 diagnosis code(s) at the highest level of specificity supported by the clinical documentation. Providers are responsible for reviewing the records and coding accurately.

    • Use the most specific applicable ICD-10 diagnosis code(s).
    Documentation Required

    Prior Conventional Radiation

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

    • State whether maximum conventional radiation has been received.
    • Indicate when this requirement is not applicable.
    Documentation Required

    Comparative Dose Analysis

    When indicated, submit a color comparative 3D-versus-IMRT dose/volume histogram (DVH) and a completed summary analysis with the prior authorization request. The analysis must demonstrate that IMRT is needed to meet dose constraints not achievable through 3D planning.

    • A comparative DVH and summary analysis are required when the applicable criteria are not met or when IMRT is needed to satisfy published organ-at-risk dose/volume constraints.
    • If possible, render the 3D and IMRT planning lines on the same graph to facilitate comparison.
    • Complete all components of the provided summary analysis table before submission.
    Documentation Required

    Organ-at-Risk Summary

    For each relevant organ at risk, provide the required dose-constraint comparison in the summary analysis. The submission must show the applicable constraint, its source, the 3D result, the IMRT result, and whether the constraint can be met only with IMRT.

    • Organ at risk.
    • Dose constraint.
    • Source of the constraint.
    • 3D result.
    • IMRT result.
    • Whether the constraint can be met only with IMRT.
    Denial Risk

    Failure to Meet Medical Necessity

    IMRT is covered only when medically necessary. If the medical-necessity requirements are not met, the plan will deny both the IMRT planning phase and the actual IMRT treatment.

    • Medical necessity must be established before coverage is provided.
    • Failure to meet the requirements results in denial of both planning and treatment.
    Denial Risk

    Incomplete Authorization Submission

    Missing required submission elements may affect the review and decision outcome, and the plan may be unable to approve the request. This includes missing clinical documentation, specific ICD-10 coding, applicable radiation history, or an indicated comparative DVH and completed summary analysis.

    • Chart notes or medical records documenting the condition, tumor type, and tumor location.
    • ICD-10 diagnosis code(s) at the highest level of specificity.
    • Documentation of maximum conventional radiation received, when applicable.
    • Color comparative 3D-versus-IMRT DVH and completed summary analysis when indicated.
    • Complete all required fields in the summary analysis before submission.
    Denial Risk

    Investigational or Experimental Service

    A procedure or device that lacks scientific evidence regarding safety and efficacy because it is investigational or experimental is noncovered as not reasonable and necessary to treat illness or injury.

    • Investigational or experimental IMRT-related services are not covered when the required evidence of safety and efficacy is lacking.
    Documents the applicable dose constraint and its source.
    Results reportedRecords the 3D result and the IMRT result.
    IMRT-only determinationDocuments whether the constraint can be met only with IMRT.