This data spotlight examines the coverage gap, or "doughnut hole," in Medicare drug plans available in 2009. While in the gap in coverage, Part D enrollees (other than those receiving low-income subsidies) are required to pay 100 percent of total drug costs until they reach the catastrophic coverage level. The spotlight is one in a series analyzing key aspects of the Medicare Part D drug plans that will be available to beneficiaries in 2009.