CPT® Code 77422

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High energy neutron radiation treatment delivery; single treatment area using a single port or parallel-opposed ports with no blocks or simple blocking

High energy neutron radiation treatment, as described by CPT® Code 77422, involves the delivery of neutron beam therapy to a specific treatment area utilizing either a single port or parallel-opposed ports without the use of blocks or simple blocking. This specialized form of external beam radiation therapy is particularly beneficial for targeting non-operable tumors that exhibit resistance to traditional radiation treatments. The treatment can be applied to various anatomical sites, including the salivary glands, head and neck regions, bone structures, joints, and soft tissues. One of the key advantages of neutron beam therapy (NBT) is its high radiation biological effect, which is attributed to the prolonged activity of neutrons at the target site. This characteristic enhances the likelihood of damaging both strands of the DNA within cancer cells, thereby complicating their ability to survive or repair from the radiation exposure. However, it is important to note that NBT also carries an increased risk of radiation exposure to the surrounding normal tissues adjacent to the tumor. The technique of using a single port involves directing one neutron beam to deliver the radiation dose, which is typically employed for palliative care or for treating superficial lesions. In contrast, the parallel-opposed ports method utilizes two neutron beams, allowing for a smaller dose from one beam and a larger dose from the other, facilitating a more uniform distribution of the radiation dose along the central axis. This approach is particularly advantageous for treating tumors located in the head and neck region.