Coverage Gap
A coverage gap is a phase of an insurance benefit, most notably the Medicare Part D drug benefit's historical doughnut hole, where the enrollee temporarily pays a larger share of costs after initial coverage but before catastrophic coverage begins.
What is a coverage gap?
A coverage gap is a defined stage within an insurance benefit during which the enrollee shoulders a larger portion of costs than at other points in the year. The best-known example is the Medicare Part D prescription-drug benefit's historical coverage gap, popularly called the doughnut hole, which sat between the initial coverage phase and catastrophic coverage.
Once a beneficiary and their plan had spent a set amount on drugs, the enrollee entered the gap and paid a higher share until their out-of-pocket spending crossed the threshold into catastrophic coverage, where costs dropped again. The structure created a temporary spike in what patients owed mid-year.
Why does the coverage gap matter?
For patients, the gap can mean an unexpected jump in drug costs partway through the year, which sometimes leads people to skip or ration medications precisely when continuity matters. Understanding where a beneficiary sits in their benefit phases helps anticipate affordability problems.
For the broader system, the coverage gap has been a focal point of policy reform aimed at smoothing out-of-pocket costs and improving medication adherence. Changes to how the gap is funded and capped continue to reshape what enrollees actually pay across the benefit year.
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