© Copyright 2026 American Medical Association. All rights reserved.
The CPT® Code 77406 refers to the delivery of radiation treatment specifically designed for a single treatment area using either a single port or parallel opposed ports. This procedure utilizes simple blocks or may not use any blocks at all. A key aspect of this code is that it applies to radiation beams that are 20 megavolts (MeV) or greater. In the context of radiation therapy, the term "single treatment area" indicates that the radiation is focused on a specific location within the body, typically where a tumor is located, with the intent to destroy cancerous cells. The use of higher energy beams, such as those at 20 MeV or above, is often necessary for penetrating deeper tissues or for treating larger tumors effectively. It is important to note that different CPT codes are designated for varying energy levels of radiation beams; for instance, lower energy beams of 5 MeV or less are coded differently, as are those in the ranges of 6-10 MeV and 11-19 MeV. This structured coding system allows for precise billing and documentation of the specific type of radiation treatment delivered to patients.
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