Passing on Medicare’s prescription drug coverage can look harmless to a healthy 65-year-old who takes no daily medications. But Medicare treats that decision as a permanent one with a price attached. Anyone who goes without qualifying drug coverage after becoming eligible, and later signs up, gets a late enrollment penalty added to their monthly premium, and it does not go away. It follows the beneficiary for as long as they hold drug coverage, growing over time, which means a short stretch of skipping Part D can turn into decades of higher premiums.
How the late enrollment penalty is built
The penalty is not a flat fee; it is calculated from how long a person went without coverage. According to Medicare’s rules, the charge equals 1 percent of the “national base beneficiary premium,” which is $38.99 in 2026, multiplied by the number of full months a person was eligible for drug coverage but went without it and without other creditable coverage. That amount is rounded to the nearest 10 cents and added to the monthly premium. Someone who waited 20 months, for example, would owe a 20 percent penalty on top of whatever their chosen plan costs. Because the base figure is a national benchmark rather than the beneficiary’s own plan price, the penalty applies the same way regardless of which plan a person eventually picks.
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Why the charge grows and never stops
The penalty has two features that make it more expensive than it first appears. First, it is permanent: once assessed, it stays attached to the premium for the entire time a person keeps Medicare drug coverage, even if they switch plans. Second, it climbs. The national base premium tends to rise most years, and because the penalty is a percentage of that moving figure, the dollar amount added each month can increase year after year. A modest-looking surcharge in the first year of enrollment can quietly grow into a larger one a decade later, all traceable to the months a beneficiary went uncovered near the start.
What counts as creditable coverage
The way to avoid the penalty entirely is to keep what Medicare calls creditable prescription drug coverage during any gap. Coverage from a current employer or a spouse’s employer, certain retiree plans, and some union or veterans’ coverage can qualify, so long as it is expected to pay, on average, at least as much as standard Medicare drug coverage. Plans are required to tell members each year whether their coverage is creditable, and Medicare’s guidance on avoiding late penalties stresses keeping those notices. A beneficiary who had creditable coverage the whole time can enroll in Part D later without any penalty; the trap is going without both Part D and creditable coverage for 63 or more days in a row.
The enrollment windows that matter
Timing is what separates a clean enrollment from a penalized one. Most people first become eligible during a seven-month initial enrollment period around their 65th birthday. Missing that window without creditable coverage starts the clock on uncovered months. After that, sign-ups are generally limited to the fall open enrollment period each year, which not only delays coverage but can add more uncovered months to the penalty calculation in the meantime. For someone who loses employer coverage later in retirement, a special enrollment period usually opens, but it comes with its own deadline, and letting it lapse reopens the penalty risk.
The math that makes a healthy year expensive
The reason the penalty catches people is that skipping Part D feels rational when no prescriptions are needed. Yet the cost of going uncovered is measured in months, not in whether any drugs were purchased. A retiree who waits several years because they feel fine can face a penalty of 30 or 40 percent of the national base premium for life, layered on top of a plan they will eventually need anyway when a prescription becomes unavoidable. Enrolling on time, even in the least expensive plan available, stops the clock and locks out a surcharge that otherwise compounds for the rest of a beneficiary’s life.
How Extra Help and a reconsideration can erase it
Two paths can eliminate a penalty that has already been assessed. The first is Extra Help, the federal low-income subsidy for Medicare drug costs: people who qualify for it do not pay the late enrollment penalty at all, so a beneficiary with limited income and assets who is hit with a surcharge should check whether they are eligible for the program, which also lowers premiums, deductibles, and copays. The second is a formal reconsideration. A beneficiary who believes the penalty is wrong, most often because they did have creditable coverage during the gap that Medicare failed to credit, can request a review through the independent contractor that handles these cases, and a favorable decision removes or reduces the charge. Both routes depend on records. The annual notices a plan sends stating whether its coverage is creditable are the evidence that settles a dispute, and a beneficiary who kept them can prove a clean stretch that would otherwise be counted as uncovered months. The penalty also travels with the person, not the plan, so switching to a cheaper drug plan or moving to a Medicare Advantage plan that includes drug coverage does not shed it; only Extra Help or a successful reconsideration does.
This article was produced with the assistance of artificial intelligence and reviewed by The Financial Wire editorial team.
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David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
