Molina and ps............ any advice?

Good evening all, I have molina insurance and am in need of plastic surgery. Not cosmetic at this point but because of the rashes and skin breakdowns and leave me with scars and because I have two blown discs in my back and my neurologist really feels getting all the excess skin removed will go a long way in helping my back and is safer than the back surgery I will have to have if no ps. Molina denied me. I do get an appeal but I was wondering if anyone out here in Michigan Land is familiar with the best way to handle an appeal with Molina. Thanks, Amy