@caretakermom You are smart to ask these questions. I asked them too before I had surgery at Mayo Rochester. I was told everyone at Mayo is an employee, not an independent contractor, so the providers who did neurological monitoring during my surgery would be in network because all the services at Mayo were employees. You can also call the billing department and ask. Other hospitals can contract a service like this, which adds a surprise out of network charge. I think they do need to provide an estimate before a procedure. The doctor doesn’t always know because they don’t do the billing.