My husband was diagnosed June 2011 with Bronchoalveolar cancer tied to Agent Orange. He had a wedge resection surgery to remove the nodule and didn't need any chemo or radiation followup do to catching it so early. He began to use a CPAP machine for sleep apnea in Oct. 2011. He is now rated at 30% for the cancer and they mentioned at the last Comp and Pen exam that the private sleep study and CPAP use had been entered into his medical records. My question is what is/are the qualifiers to obtain the VA 50% rating for CPAP use?