I'll tell you what I told my sister to do when she was thinking of going to a new insurance plan...go to more than one doctor and talk to their office managers and lay it out to them. THEY know what pays off and what does not, what company is slow to pay and argues about procedures, etc.
Take a big purse and when you get up from a chair or are thanking them for their help, pull out a box of candy for them.
THEY WILL REMEMBER YOU...especially should you ever be, or are a patient there.