There may be a charge/membership fee for this service. I have not used this service, so I can't really answer any questions about it.
Here is a link to an article--containing links to other articles & resources--regarding herp veterinarians. The article (and I presume the links) are from 2014, so... some additional legwork may be required: Herp Veterinarians
I go to Midway Veterinary Hospital in Chesapeake, VA (in case any of you are near me and want to go there). They've taken excellent care of my beardie!