Yep, I think that is correct.A google search found this answer.....(No, you don't need to have creditable insurance coverage before you can get Medicare coverage)
I should have said, "yes, one needs to have "creditable coverage" on some insurance plans before getting into Medicare Part D drug plan.." At least that is the one I know about.
To make this more confusing/interesting for me, is that I have a bit of retirement money from my employer that can be applied to health care after retirement. The money was a very small token amount the company gave to some employees when they did away with a defined pension, and more importantly, the retirement health care benefit. The bit of money might last one year prior to Medicare and can only be used on health plans provided by the company. One of the requirements to keep the money, is to maintain health care coverage.