Summary & Overview
HCPCS G6001: Ultrasonic Guidance for Radiation Therapy Field Placement
HCPCS Level II code G6001 designates ultrasonic guidance used to place and verify radiation therapy fields. Image-guided field placement supports accurate targeting of radiation, which can affect treatment precision, normal-tissue sparing, and documentation for payer reimbursement. Nationally, use of guidance codes intersects with advances in image-guided radiation therapy and standardized billing practices.
Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an explanation of what G6001 represents, typical clinical settings where the service is performed, and the types of information tracked for payer coverage and billing. The publication summarizes common modifiers and operational considerations, highlights coding relationships within radiation oncology service lines, and outlines where to find policy updates or payer-specific guidance.
This summary provides a concise reference for revenue cycle, billing staff, and clinical teams involved in radiation therapy delivery. It situates G6001 within broader image-guided radiation therapy workflows and clarifies what to expect when reviewing coverage rules, claim submission requirements, and documentation best practices. Data not available in the input is noted where applicable.
Billing Code Overview
HCPCS Level II code G6001 describes ultrasonic guidance for placement of radiation therapy fields. This service involves use of ultrasound imaging to localize and guide the positioning of radiation therapy fields to ensure accurate targeting of treatment volumes.
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Service type: Image-guided radiation therapy planning and field placement
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Typical site of service: Hospital outpatient radiation oncology departments, freestanding radiation therapy centers, and other ambulatory cancer treatment facilities
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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.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 | Service performed by the physician | When the radiation oncologist personally performs the ultrasound guidance rather than a non-physician staff |