When you enter the "donut hole," prescriptions can become prohibitively expensive. But changing insurers won't help; the hole comes from Medicare, and although the Affordable Care Act will eventually do away with it, boomers are stuck with it until 2020.

Basic Medicare only covers 80 percent of most covered medical services, and there's no ceiling on those co-payments. So where should seniors turn to help them pay for the rest of their care? Making Sen$e "Medicare Maven" Philip Moeller updates…