For the record, here's what the Medicare & You booklet says. p 13
"If you join a private Medicare health or prescription drug plan, your plan can change how much it costs and what it covers each year...Review your plan each year...If you're satisfied that your current plan will meet your needs for next year, you don't need to do anything."
That's it. Notice the first words - "If you join a PRIVATE Medicare plan..."
Well, I'm not joining a private plan! They never answer the simple question, do I need to do anything if I'm sticking with the government's Medicare A and B.
They don't answer it in the booklet, and they don't address it on the website.