If you have heard that Medicare prescription coverage includes a “donut hole,” you may be expecting a point in the year when your drug costs suddenly move into a separate coverage gap. That description belongs to the old Part D system. The coverage-gap stage was eliminated in 2025, and the current benefit has an annual limit on qualifying out-of-pocket drug spending.
That is a meaningful change for someone taking an expensive medicine, but it does not make every prescription free or every plan interchangeable. Your deductible, the medicines your plan covers and the timing of your bills still shape what you pay.
How drug costs move through the year
Part D coverage now has three stages: the deductible, initial coverage and catastrophic coverage. In 2026, a plan's deductible cannot exceed $615, although some plans have a lower deductible or none. A plan may also exempt certain drug tiers from its deductible.
After any applicable deductible, you share the cost of covered medicines with the plan. The standard benefit uses 25% coinsurance in this stage, while individual plans may use different copayments or coinsurance arrangements. The amount printed on your plan's drug list is therefore more useful for a particular prescription than assuming every refill will cost the same percentage.
Once qualifying out-of-pocket spending reaches $2,100 in 2026, you pay no further cost sharing for covered Part D drugs for the rest of that calendar year. That final stage is still called catastrophic coverage, even though you do not have to suffer a particular illness or medical event to reach it.
The annual amounts can change. If you are comparing coverage for another year, check the current Part D limits on Medicare.gov rather than carrying the 2026 figures into a new budget.
What the $2,100 limit actually covers
The out-of-pocket limit applies to covered Part D drugs. Your plan premiums do not count toward it, and neither do your ordinary doctor or hospital bills. Medicines paid for under Part B are outside this Part D limit too. If a medicine is not covered by your plan, paying for it yourself does not automatically move you closer to the cap.
Your deductible and qualifying copayments or coinsurance count toward the threshold. Certain payments made on your behalf can also count, so the total is not always identical to the amount you personally paid at the pharmacy. Your plan's Explanation of Benefits tracks the spending used to determine your coverage stage.
For a simple illustration, suppose your plan shows that $1,900 has counted toward the 2026 limit. The remaining distance to the threshold is $200, not another full $2,100. Once the threshold is reached, covered Part D prescriptions have no further cost sharing that year. Monthly plan premiums can still continue.
This is why it helps to keep Medicare premiums and other coverage costs separate from prescription spending in your retirement budget. One limit does not cap the whole cost of Medicare.
A lower annual bill can still be difficult to pay early
Someone with costly prescriptions may reach the annual threshold relatively early. Even with a limit, paying a large amount during the first few months can be difficult if the household budget is built around a steady monthly income.
The Medicare Prescription Payment Plan spreads your out-of-pocket drug costs across the calendar year; it does not reduce the total you owe. Participation is voluntary and available through Medicare drug plans. Instead of paying the pharmacy for the covered out-of-pocket amount, you receive bills from your plan. Those monthly bills can change as you fill prescriptions and as the remaining months of the year decrease.
If that would make your expenses easier to manage, you can see how to join the prescription payment option on Medicare.gov. It is a payment arrangement, so it is worth distinguishing it from assistance programs that can actually lower costs.
Why the choice of plan still matters
Your plan's formulary is its list of covered drugs. Medicines may fall into different cost-sharing tiers, and coverage can involve prior authorization or other restrictions. Pharmacy choice can affect your costs as well. Two plans with the same annual spending limit can therefore produce different experiences at the pharmacy.
A practical comparison starts with the medicines you currently take, including their dose and refill frequency. From there, you can compare coverage, pharmacy costs and annual premiums. If the plan does not cover a prescription you rely on, that deserves attention before a low premium persuades you.
The end of the donut hole makes the annual spending picture easier to understand. The remaining decision is choosing coverage that works for your medicines and a way of paying for it that fits your monthly income.
