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    OpenPayerBilling CodesProcedures / Professional ServicesHCPCS hcpcs-g6001-ultrasonic-guidance-radiation-therapy-field-placement
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    HCPCS G6001: Ultrasonic Guidance for Radiation Therapy Field Placement

    HCPCS Level II code G6001 represents ultrasonic guidance for placement of radiation therapy fields, a procedural service used during radiation therapy planning and delivery to localize targets using ultrasound imaging; service type: image-guided localization for radiation therapy; typical site of service: radiation oncology departments or hospital outpatient settings where radiation treatment is planned and delivered.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult undergoing external beam radiation therapy for a localized malignancy such as prostate cancer, breast cancer, or a soft-tissue sarcoma. The radiation oncology team uses ultrasound guidance during simulation and daily field placement to verify target location and organ-at-risk position prior to treatment delivery. The workflow begins with the radiation oncologist and dosimetrist defining treatment fields at simulation. A radiation therapist positions the patient and uses real-time ultrasound imaging to localize internal structures and confirm alignment of radiation fields before port films or cone-beam CT. Ultrasonic guidance G6001 is used when sonographic visualization improves field placement accuracy (for example, verifying prostate position relative to surface marks or ensuring bladder filling for pelvic fields). Documentation includes indication, ultrasound images or notes, time and date, personnel performing guidance, and any adjustments to patient position or field parameters made as a result of the ultrasound findings.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77261Therapeutic radiology simulation-aided field setting, simpleSimulation session that may precede ultrasonic-guided field placement for simple cases
    77262Therapeutic radiology simulation-aided field setting, intermediateUsed for more complex simulation when ultrasound aids in defining fields
    77263Therapeutic radiology simulation-aided field setting, complexFor complex simulation requiring image guidance and multiple parameters documented
    77412Therapeutic radiology port film(s) for localization and/or verification of treatment field positionOften performed after ultrasonic guidance to document field placement and verification
    77336Radiation treatment devices (e.g., bolus), radiation field adjustmentsBilled when adjustments to treatment fields or devices are made as a result of ultrasound localization

    Related Modifiers

    7 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…
    25CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
    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…
    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…
    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
    2084P0800XPsychiatry PhysicianA Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
    174400000XSpecialistAn individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond…
    3336C0003XCommunity/Retail PharmacyA pharmacy where pharmacists store, prepare, and dispense medicinal preparations and/or prescriptions for a local patient population in accordance wit…
    207K00000XAllergy & Immunology PhysicianAn allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Select…
    111NR0200XRadiology ChiropractorChiropractic radiology is a referral specialty that provides consultation services at the request of other qualified doctors. Chiropractic radiologist…
    103TH0100XHealth Service PsychologistA psychologist, certified/licensed at the independent practice level in his/her state, who is duly trained and experienced in the delivery of direct, …
    103TR0400XRehabilitation PsychologistA psychologist who specializes in the study and application of psychological principles on behalf of persons who have disability due to injury or illn…
    376G00000XNursing Home AdministratorAn individual, often licensed by the state, who is responsible for the management of a nursing home.

    Related ICD-10-CM Codes

    27 rows

    ICD-10-CM CodeDescription
    C15.9Malignant neoplasm of esophagus, unspecified
    C18.9Malignant neoplasm of colon, unspecified
    C20Malignant neoplasm of rectum
    C22.0Liver cell carcinoma
    C33Malignant neoplasm of trachea
    C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
    C43.9Malignant melanoma of skin, unspecified
    C44.91Basal cell carcinoma of skin, unspecified
    C50.911Malignant neoplasm of unspecified site of right female breast
    C54.9Malignant neoplasm of corpus uteri, unspecified

    Showing 1–10 of 27

    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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