Final answer:
A physician accepting all Medicare claims is called a participating provider, agreeing to accept Medicare-approved amounts as full payments for services.
Step-by-step explanation:
A participating provider is a physician who accepts assignment of all Medicare claims. By doing so, they agree to adhere to Medicare-approved rates as complete payment for covered services. This arrangement benefits Medicare beneficiaries, as it limits their out-of-pocket expenses and streamlines the billing process. Participating providers submit claims directly to Medicare, obliging them to follow Medicare's guidelines. In essence, this commitment ensures that patients receive necessary medical services while avoiding excessive financial burdens.