As many of us know, those who have Medicare Part D are at risk of falling into the coverage gap, or what we call, the "doughnut hole." In response, AARP has put together a Doughnut Hole Calculator that can allow you to see if your Part D plan may leave you with the coverage gap.
It also has a video tour showing you how to use the calculator. In short, if you have Medicare Part D, you want to use this and figure out where you stand.