If I have time on my hands, I'll play along with these jerks, if only to prevent them from trying to scam someone else.

Conversation goes something like this

Scammer: You have a free benefit from Medicare. It won't cost you anything

Me: Who authorized this?

S: Medicare

M: Medicare doesn't authorize anything. It has to be a physician, physician assistant or nurse practioner. And why isn't this going to cost me anything. Who's paying the coinsurance?

S: It's a special deal authorized my Medicare that waives the coinsurance.

M. Medicare doesn't do that. And I told you, Medicare doesn't authorize benefits.

S. You don't know what you're talking about.

M: Really? I'm a retired hospital CFO so I think I do know what I'm talking about. I'm not going to give you my Medicare information, so you might as well hang up

S. F you and hangs up