No, you do not need to be a patient at Mayo. As a matter of fact, I was turned down for evaluation there because they said current local doctors in New York could continue to help me with my diagnoses. That's when I chose to apply to the Pain Rehab Center.

Here is a link to apply to Mayo Clinic:
http://mayocl.in/1mtmR63
You can choose whether you wish to apply online or request a phone call and speak with a human. Everyone at Mayo is extremely helpful and accommodating.

Are you considering applying to the PRC in Jacksonville? Fantastic place, and hands down, Dr. Sletten is a phenomenal doctor who heads up the program there.