Medicare Part D plan generosity and medication use among dual-eligible nursing home residents.

In 2006, dual-eligible nursing home residents were randomly assigned to a Medicare Part D prescription drug plan (PDP). Subsequently, residents not enrolled in qualified plans at the start of the next year were rerandomized. PDPs vary in generosity through differences in medication coverage and utilization management. Therefore, residents' assigned plans may be relatively more or less generous for their particular drugs. The impact of generosity on residents' medication use and health outcomes is unknown.