There are several sources for this information, some date back to 2010 or before, but I imagine there are more doctors now refusing to accept unvaccinated patients, and are actually "firing" those they've been treating.
If you have unvaccinated children, you may need to find a new pediatrician. But then if it gets mandated, you may be on your own unless you can find a "criminal" pediatrician, or turn to natural remedies. I think emergencies wouldn't be turned away by hospitals.
One source:www.buzzfeed.com/azeenghorayshi/meet-the-doctors-who-are-rejecting-unvaccinated-patients#.tynlxdnbm
It's also on www.NaturalNews, but many people don't trust this site.