I would contact your insurance and ask for special approval to see a qualified surgeon. Most insurances also pay for a second opinion consultation. The insurance rep on the phone may say, “no,” but you can ask to speak to a supervisor, and keep taking it up the ladder to seek approval. Your insurance may have a formal application or process by which you can request specialized care, appeal, etc. I would get your PCP and others involved by having them write letters to the proper insurance rep supporting your need for a specialized surgeon.
You might also speak to Mayo. Most insurances have out-of-network benefits and Mayo might accept that as payment.
Good luck to you!