I just checked the list of Doctors who might treat CIDP.. As far as I could tell, it is just that a list of Doctors who MIGHT treat CIDP. In my opinion there is no way to tell their experience in treating CIDP. The ratings cover everything that they treat.
The list of doctors - state-by-state: http://www.healthgrades.com/chronic-inflammatory-demyelinating-poly
I have checked the list of centers. And it is also just that a list. And then there is the Freedom Of Information Act. There is no nearby support group to Johns Hopkins Hospital. There is nowhere someone could get a first hand report on the doctors on that list. So it is just that a list. If there were ratings for CIDP treatment only, it would be a better list.