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    OpenPayerBilling CodesProcedures / Professional ServicesHCPCS hcpcs-g6016-compensator-beam-modulation-inverse-planned-therapy
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    HCPCS G6016: Compensator-Based Beam Modulation Radiation Therapy

    HCPCS Level II code G6016 represents compensator-based beam modulation delivery of an inverse-planned radiation therapy using three or more high-resolution (milled or cast) compensators with convergent beam modulated fields, delivered per treatment session; service type: external beam radiation therapy with custom compensators, typical site of service: hospital outpatient department or radiation oncology center.

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    Table of contents

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    • Billing CodesCPT, HCPCS, DRG & more
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    Clinical & Coding Specifications

    Clinical Context

    A 64-year-old patient with a locally advanced squamous cell carcinoma of the oropharynx is referred for definitive external beam radiation therapy. The radiation oncology team selects an inverse-planned, compensator-based beam-modulated treatment because of complex target geometry abutting critical structures (oral cavity, spinal cord, and salivary glands). A high-resolution, milled compensator system with three or more convergent, beam-modulated fields is fabricated for daily treatment delivery. Simulation (CT-based), target and organ-at-risk contouring, inverse planning with dosimetric review, and compensator fabrication occur prior to the first fraction. At each treatment session, treatment delivery uses the compensator assembly to shape intensity across convergent fields; daily setup verification (portal imaging or cone-beam CT) and immobilization are performed. Typical workflow participants include the radiation oncologist (prescription and plan approval), medical physicist (compensator design verification and QA), dosimetrist (inverse planning and compensator specifications), radiation therapist (treatment delivery and daily imaging), and nursing/support staff for patient management.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77290Therapeutic radiology simulation-aided field setting; simple localization onlyInitial simulation sessions to localize target fields prior to compensator design; used for basic setup when applicable.
    77295Therapeutic radiology simulation-aided field setting; complex localization, including 3D simulationCT simulation and complex localization required for inverse-planned compensator-based treatments.
    77301Radiation treatment planning, complex (e.g., IMRT)Inverse planning, dose calculations, and planning tasks that support compensator-based beam modulation.
    77336Continuing medical physics consultation, assessment of treatment parameters, during course of therapyOngoing physics oversight and assessment of delivered doses and compensator performance.
    77412Radiation treatment delivery, per day, to 3D conformal therapy targetsDaily delivery code for 3D conformal techniques; compensator-based convergent beam modulation sessions may be reported with appropriate payer guidance.
    77261Therapeutic radiology simulation; simpleUse for simpler simulation visits when applicable; often preceded by 77295 for complex cases.

    Related Modifiers

    9 rows

    ModifierDescriptionWhen to Use
    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…
    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…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    174400000XSpecialistAn individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond…
    363L00000XNurse Practitioner(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
    2084A2900XNeurocritical Care PhysicianThe medical subspecialty of Neurocritical Care is devoted to the comprehensive, multisystem care of the critically-ill neurological patient. Like othe…
    363A00000XPhysician AssistantA physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and…
    2278P1005XPulmonary Rehabilitation Certified Respiratory TherapistThe respiratory therapist can assist the chronic pulmonary patient in returning to an optimal role in society by providing an effective program. It i…
    2080P0210XPediatric Nephrology PhysicianA pediatrician who deals with the normal and abnormal development and maturation of the kidney and urinary tract, the mechanisms by which the kidney c…
    246R00000XPathology TechnicianAn individual with knowledge of specific techniques and instruments who performs all of the routine tests in a medical laboratory and who has the abil…
    207SG0203XClinical Molecular Genetics PhysicianA clinical molecular geneticist demonstrates competence in performing and interpreting molecular analyses relevant to the diagnosis and management of …

    Related ICD-10-CM Codes

    25 rows

    ICD-10-CM CodeDescription
    C00.9Malignant neoplasm of lip, unspecified
    C15.9Malignant neoplasm of esophagus, unspecified
    C18.9Malignant neoplasm of colon, unspecified
    C20Malignant neoplasm of rectum
    C22.0Liver cell carcinoma
    C23Malignant neoplasm of gallbladder
    C24.1Malignant neoplasm of ampulla of Vater
    C33Malignant neoplasm of trachea
    C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
    C43.9Malignant melanoma of skin, unspecified

    Showing 1–10 of 25

    Related Codes

    HCPCS-G9490-HOME-ASSESSMENT-NON-HOMEBOUND

    HCPCS G9490: Home Visit Patient Assessment for Non-Homebound Beneficiary

    HCPCS-G0008-INFLUENZA-VACCINE-ADMINISTRATION

    HCPCS G0008: Administration of Influenza Virus Vaccine

    HCPCS-G0009-PNEUMOCOCCAL-VACCINE-ADMINISTRATION

    HCPCS G0009: Administration of Pneumococcal Vaccine

    HCPCS-G0010-HEPATITIS-B-VACCINE-ADMINISTRATION

    HCPCS G0010: Administration of Hepatitis B Vaccine

    HCPCS-G0011-PREP-COUNSELING-HIV-RISK-REDUCTION-ADHERENCE

    HCPCS G0011: Individual PrEP Counseling, HIV Risk Assessment

    HCPCS-G0012-PRE-EXPOSURE-PROPHYLAXIS-INJECTION-HIV-PREVENTION

    HCPCS G0012: Injection of PrEP Drug for HIV Prevention

    HCPCS-G0013-PREP-INDIVIDUAL-COUNSELING-HIV-RISK-REDUCTION

    HCPCS G0013: Individual PrEP Counseling by Clinical Staff

    HCPCS-G0017-PSYCHOTHERAPY-CRISIS-FIRST-60-MINUTES-NON-OFFICE

    HCPCS G0017: Psychotherapy for Crisis, First 60 Minutes

    HCPCS-G0018-PSYCHOTHERAPY-CRISIS-ADDITIONAL-30-MINUTES-NON-OFFICE

    HCPCS G0018: Psychotherapy for Crisis, Additional 30 Minutes

    HCPCS-G0019-COMMUNITY-HEALTH-INTEGRATION-SDOH-CARE-COORDINATION

    HCPCS G0019: Community Health Integration, Person-Centered Assessment

    Showing 1–10 of 1996

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    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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