HCPCS code G6015: Intensity modulated treatment delivery, single or multiple fields/arcs, via narrow spatially and temporally modulated beams, binary, dynamic MLC, per treatment session

Obtain a list of the documentation and billing requirements for proper use and billing of HCPCS code G6015 from our short guide.

Use Code

## **What is HCPCS code G6015?** HCPCS G6015 refers to the delivery of intensity-modulated radiation therapy (IMRT) using binary, dynamic multi-leaf collimators (MLCs) in narrow spatial and temporal modulation across one or more fields or arcs per radiation treatment session. This code describes the technical delivery of highly conformal radiation, aiming to maximize dose to the tumor while minimizing exposure to surrounding healthy tissues through precise beam modulation. Furthermore, it is specifically used for the technical component of IMRT treatment delivery or radiation treatment delivery in a freestanding radiation oncology center or physician's office, not in a hospital setting. IMRT is an advanced form of radiation therapy that uses computer-controlled linear accelerators to deliver precise radiation doses to a tumor while minimizing exposure to surrounding healthy tissues.It's often utilized for tumors located near critical structures like the spinal cord, optic nerves, head and neck region, breast, prostate, or central nervous system.

## **HCPCS code G6015 documentation requirements** Proper documentation is critical for billing G6015. The medical record must contain a clear and detailed account of the services provided to support the medical necessity of the treatment. Key documentation requirements include: - **Dated and signed record of administration**: Every treatment session must be documented with the date and a legible signature of the provider responsible for the care. - **Machine settings**: The record should include the specific machine settings that correspond to the IMRT treatment plan. - **Verification of accurate delivery**: There must be documentation showing that the treatment was delivered accurately, typically including dosimetric verification. The radiation oncologist’s signature is required, and the medical physicist’s QA documentation should also be available in the record, though not all payers require the physicist’s signature on the treatment delivery note itself. - **Treatment plan details**: The record must include all documentation from the clinical treatment planning, such as the goals of treatment, the volume of treatment, and the time/dose considerations. - **Clinical necessity**: The documentation must justify the use of IMRT over conventional 3D planning. This is often the case when the target volume is close to critical structures that need to be protected, or when dose escalation is planned..

## **G6015 billing requirements** To properly bill for G6015, the following requirements must be considered: - Use G6015 under the Medicare Physician Fee Schedule (MPFS) for IMRT delivery in freestanding or office settings. Medicare requires G-codes (such as G6015 or G6016) instead of CPT codes 77385–77386 in these settings, though the CPT codes remain valid for commercial payer billing. - Do not report CPT 77301 (planning) on the same day as G6015 unless additional distinct modalities are used. - In freestanding settings, billing typically uses G‐codes; in hospital outpatient settings, corresponding CPT codes (77385–77386) may still apply. - Image-guided radiation therapy (IGRT) codes (e.g., G6001, G6002, G6017) can be billed separately as distinct services alongside G6015, following proper technical (TC) and professional component (PC) split billing rules.

## **Other relevant codes** - **G6016**: Solid compensator-based IMRT delivery (alternative to dynamic MLC method). - **CPT 77385 / 77386**: IMRT delivery including guidance and tracking, often used in hospital outpatient settings. - **CPT 77301**: IMRT planning, including dose-volume histograms; not reportable the same day as G6015 without separate indication. - **IGRT codes**: G6001 – Ultrasonic guidance G6002 – Stereoscopic X-ray guidance G6017 – Intra-fraction tracking (e.g., 3D surface or gating tracking)

Frequently asked questions

Generally no. CPT 77301 (IMRT planning) is not reportable on the same day as G6015 unless additional distinct modalities apply.

No. While they both describe IMRT delivery, G6015 is used in a freestanding setting, and 77385 is for a hospital outpatient setting. This distinction is critical for Medicare billing.

Common errors include insufficient documentation to support the medical necessity of IMRT, missing or illegible signatures, and incorrect coding for the place of service.