Daisy girl you get Medicare and either he A or the B comes automatically. I can't remember which. You can opt out of the other. I took both of them. When my husband retired and I no longer had his company insurance as my primarey I had to depend on Medicare only. So there are all kinds of Medicare supplements sold. At the time I was picking Medicare Advantage was one of the big ones. I think it is manged by the government but lets all sorts of insurance carriers sell it. I got mine through Anthem Blue Cross. At the time I got it I got it for $14/month which also covered, now don't get confused here, Medicare D which was a pharmacy plan with it. Medicare by itself does not have a pharmacy plan except for a very few medicines. And I mean very few. the advantage plan covers wellness issues mainly, things to keep up with to maintain your wellness. If you have, like my Mom, a lot of medical issues you pay out the wazoo! She still paid the $14/month.We did not know that at the time. Our agent dfidn't tell us

I think she was just so glad to get two clients in her office at one time she sold my Mom the same thing as me.
I fear that the wonderful price of $14/month may be in the past though. I sure hope not. I haven't seen what it is. There have been just rumors. One good thing the Advntage plan had was a free Silver Sneakers membership to whatever gym in your area had Silver Sneakers. I chose the YMCA. It's free!!!! My water therapy, gym access, anything you want to do plus the Silver Sneaker programs have little get togethers.
I hope I cleared up some things.