CureusMaking Sense of the 2026 Centers for Medicare and Medicaid Services (CMS) Radiation Oncology Treatment Delivery Codes: Historical Context and Practical Applications for Clinicians

CMS replaced legacy radiation oncology G-codes with a streamlined four-code complexity-based CPT structure effective January 1, 2026. The new framework consolidates 17 G-codes plus 77014 into codes 77387, 77402, 77407, and 77412.

Professional Impact

• Code 77407 becomes the workhorse, expected to capture over 50% of EBRT delivery for 3D-CRT and IMRT/VMAT without motion management.
• 77412 applies to roughly 35% of treatments when any one criterion is met: active motion management, multiple isocenters, mixed photon-electron, or total skin electron therapy.
• The technical component of 77387 is now bundled as a “B” status code; only the professional component bills separately at 0.68 RVU.
• IGRT alone does not justify 77412; active motion management requires continuous or gated intra-fraction control during beam delivery.

Action Items

• Review institutional coding workflows to align with the four-code structure before billing.
• Document the specific criterion supporting 77412 selection in every applicable case.
• Train clinical and billing staff on the IGRT versus active motion management distinction.
• Establish documentation standards distinguishing volumetric planning thresholds for 77407 versus 77402.

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