As I checked the front desk of the clinic, the receptionist sais that Medicare

[JustABozoOnThisBus]

11. You're right, nobody at a Dr's office should care how much your Medicare costs you.

It's between you and Medicare how much you pay, whether you pay the "normal" amount, or have a permanent penalty because of some unexcused delay, or if you have a year-by-year "penalty" because your income was high a couple of years ago. All the nurse/clerk should care about is that you have Medicare (and supplemental).