Patient who presented with grade II Astrocytoma. The patient underwent a subtotal resection. The patient was recommended adjuvant radiation therapy (RT) using Proton beam. The requested health service/treatment of PBT: Proton Beam Therapy is not medically necessary for this patient. The health plan determination is upheld in whole. Proton beam is being evaluated under The National Cancer Institute (NCI) sponsored trials. Currently there is insufficient clinical data to discern whether treatment with proton beam offers a clinical benefit compared to conventional photon beam treatment. National Comprehensive Cancer Network (NCCN) guidelines do not support the routine use of proton beam in the treatment of CNS malignancies.