Before revision: The Medicare Part D coverage gap (informally known as the Medicare donut hole) was a period of consumer payments for prescription medication costs that lied between the initial coverage limit and the catastrophic coverage threshold when the consumer was a member of a Medicare Part D prescription-drug program administered by the United States federal government.
After revision: The Medicare Part D coverage gap (informally known as the Medicare donut hole) was a period of consumer payments for prescription medication costs that lay between the initial coverage limit and the catastrophic coverage threshold when the consumer was a member of a Medicare Part D prescription-drug program administered by the United States federal government.