Gblack

First I would like to say sorry, because I know this has probably been answered many times. But I recently had my Sleep Apnea claim denied becuase they said my sleep apnea was not service connected. Well here is where I am confused about the whole situation. In my medical records I have a diagnosis of OSA sleep apnea dated May 13, 2014 and I was issued a CPAP July 1, 2014. I seperated from the Air Force Sep 2015, due to VSP. So how come my Sleep Apnea claim not service connected? I started to have symptoms after a deployment. I really think it was an error, so should I file a NOD? Or do I need aditional evidence? I thought I gave them the dagger that they needed to apporve my claim. Diagnosis is in my medical records, had the diagnosis from the sleep study, so what else is needed. And to put the gravy on top the VA clinic even issued me a new CPAP machine this past June. Please help me out...