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    v1.0.28
    OpenPayerBilling CodesProcedures / Professional ServicesHCPCS hcpcs-g6015-intensity-modulated-radiation-therapy-dynamic-mlc-session
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    HCPCS G6015: Intensity Modulated Treatment Delivery, Dynamic MLC

    HCPCS Level II code G6015 describes an intensity-modulated radiation therapy (IMRT) treatment delivery technique using narrow spatially and temporally modulated beams with a binary, dynamic multileaf collimator (MLC) for a single or multiple fields/arcs provided per treatment session; service type is external beam radiation therapy (IMRT) and the typical site of service is an outpatient radiation oncology clinic or hospital radiation therapy department.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is a 64-year-old with locally advanced prostate cancer referred for definitive external beam radiation. The radiation oncology team prescribes highly conformal therapy using intensity modulated treatment delivery with narrow spatially and temporally modulated beams delivered via dynamic binary multileaf collimator (MLC) per treatment session (G6015). Simulation occurs with CT and MRI fusion for target delineation. A radiation oncologist and medical physicist perform treatment planning using inverse planning IMRT or VMAT techniques to meet dose constraints for the prostate and spare rectum, bladder, and neurovascular structures. Prior to the first fraction, image guidance (cone-beam CT or orthogonal kV imaging) verifies patient setup; daily treatment is delivered in the radiation therapy department or outpatient cancer center. Typical workflow steps: simulation → contouring → physics plan optimization and QA → first-fraction verification → daily delivery of G6015 sessions with periodic on-treatment visits and weekly chart checks by clinical staff.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77301Radiation treatment management, 5 treatmentsWeekly management service often billed during a course that includes G6015 fractions
    77336Continuing medical physics consultation, including assessment and QAPerformed periodically during an IMRT course to support G6015 delivery
    77014Computed tomography guidance for localization and trackingImage guidance used for setup verification before G6015 delivery
    77295Therapeutic radiology portal dosimetry and treatment device checkPre-treatment device checks and dosimetry related to complex IMRT delivery
    77427Radiation treatment management, complex or new, per fractionReflects management for complex treatments delivered with G6015

    Related Modifiers

    8 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…
    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…
    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…
    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…

    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…
    2086S0102XSurgical Critical Care PhysicianA surgeon with expertise in the management of the critically ill and postoperative patient, particularly the trauma victim, who specializes in critica…
    1223X0400XOrthodontics and Dentofacial Orthopedics DentistryThat area of dentistry concerned with the supervision, guidance and correction of the growing or mature dentofacial structures, including those condit…
    225C00000XRehabilitation CounselorAn individual trained and educated in a systematic process of assisting persons with physical, mental, developmental, cognitive, and emotional disabil…
    207ZP0213XPediatric Pathology PhysicianA pediatric pathologist is expert in the laboratory diagnosis of diseases that occur during fetal growth, infancy and child development. The practice …
    2084S0010XSports Medicine (Psychiatry & Neurology) PhysicianA psychiatrist or neurologist who specializes in the diagnosis and treatment of sports related conditions and injuries.
    207X00000XOrthopaedic Surgery PhysicianAn orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated…
    2080P0202XPediatric Cardiology PhysicianA pediatric cardiologist provides comprehensive care to patients with cardiovascular problems. This specialist is skilled in selecting, performing and…

    Related ICD-10-CM Codes

    28 rows

    ICD-10-CM CodeDescription
    C07Malignant neoplasm of parotid gland
    C08.0Malignant neoplasm of submandibular gland
    C10.9Malignant neoplasm of oropharynx, unspecified
    C16.9Malignant neoplasm of stomach, unspecified
    C18.9Malignant neoplasm of colon, unspecified
    C22.0Liver cell carcinoma
    C25.9Malignant neoplasm of pancreas, unspecified
    C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
    C41.9Malignant neoplasm of bone and articular cartilage, unspecified
    C43.9Malignant melanoma of skin, unspecified

    Showing 1–10 of 28

    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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