FIRST find out your insurance company's appeal process policy. I am fighting mine to get an insulin pump. I appealed the first time with only a letter from my doctor which was not enough, I was denied again. If I only knew, my doctor could have had a peer-to-peer chat with the doc or medical adviser who is making the decision on behalf of your insurance company. Also I would have known that a second opinion from another doctor could have helped.
So I highly advise you check with your insurance company to see what is needed for an appeal BEFORE you go for it. But definitely appeal.