No, you just make it compulsory to accept Medicare.

Actually I thought that was already the case.

The "just" is doing some heavy lifting there. Clinicians aren't required to participate in Medicare; in fact they have to go through a complex process in order to join. And there's no way that such a mandate could ever pass Congress, or be effectively enforced. Let's focus on reforms that are actually achievable in the real world.

https://www.cms.gov/medicare/enrollment-renewal/providers-su...