Dexcom G4 Coverage in Canada

Hi All,
I'm wondering if any of you have had success with getting a CGM covered in Ontario through any means possible. My work insurance (Green Shield) just denied our claim for it for our 9-year-old son ... who's had 3 seizures from lows which is why we purchased it. As you know, the ongoing costs are significant so any help you can provide would be greatly appreciated. Rachel