@nancyeburford Here is the page for insurance information for Mayo that I'm posting for everyone who is wondering. The best bet is to call the Mayo Insurance & Billing office and ask if your insurance is accepted before requesting an appointment. Medicare "Advantage' plans tend to look at claims that were already paid and re-evaluate them. They may deny them after the fact, and then come back to the provider for reimbursement. That's why a lot of providers won't accept them. If a provider is in the network of the "advantage" plan, it is a bit like being an HMO provider and they dictate what the provider is able to charge for the care often at a lesser rate. I can understand why Mayo doesn't accept them because it is a risk that they will loose money if claims are reassessed and denied. This is the reason I stayed with real Medicare because that is accepted at Mayo and elsewhere in the country.
https://www.mayoclinic.org/billing-insurance/insurance