More on the adverse selection problems with Part D from a research study by DSS Research. The study indicates more than half of eligible seniors have no plans to enroll in a Part D program. And, their characteristics should set alarm bells ringing at every Part D sponsor:

"Disinterested, non-buyers are lowest users of medical services. Those who said they had not chosen a plan and had no plans to do so take fewer prescriptions; spend less on prescriptions; go to the doctor less often; and make fewer ER, inpatient hospital and outpatient clinic / surgery center visits."

In other words, they are healthy, aren't likely to need the coverage any time soon, and aren't interested in subsidizing the costs of their less-healthy fellow seniors. This is exactly why Part D is a really bad idea, poorly executed too.