Long lines in waiting rooms of hospital emergency rooms are often misinterpreted as solely due to demand from the uninsured. Certainly some of the people are there because they have no insurance and they know hospitals have to provide them care. But many of the people in that waiting room do have insurance through Medicare. But they cannot find a doctor who will treat them at Medicare's combination of low reimbursement rates and onerous paperwork requirements.
Five minutes with using supply and demand curves and the most basic lessons of microeconomics would have predicted this. In fact I did, about a year ago.