Here's an excerpt:
One of the Mayo Clinic's two family-medicine practices in Arizona soon will stop accepting Medicare, leaving thousands of patients to pay out of pocket for routine doctor's visits or find a new physician.If a "Medicare-for-all" system were implemented at the national level, expect to see more doctors declining to accept such patients.
...Hospital officials called the new policy a "two-year pilot program" and said Thursday that the changes are necessary because of low Medicare reimbursement rates.
..."Medicare now only covers about half our costs," [vice chairman of the executive-operations team at Mayo Clinic of Arizona, Dr. R. Scott] Gorman said.
This again illustrates the principle that "coverage" does not equal care.