Medicare Part D premiums, deductibles, and out-of-pocket limits

Medicare Part D is prescription drug coverage, and what you pay depends on which plan you choose and which drugs you take. There is no single "Medicare D cost" — instead, every plan sets its own monthly premium, annual deductible, and copayments or coinsurance for each drug. The government does set a yearly out-of-pocket spending limit: once you and your plan have paid a combined total toward your drugs, your cost-sharing stops and the plan covers 95 percent of remaining drug costs for the rest of that year.

In 2025, the standard out-of-pocket limit is $8,000. That does not mean you will pay $8,000 — many people pay far less because their premiums and copayments never reach that threshold. But it is the maximum you can be asked to pay in a calendar year before catastrophic coverage kicks in.

The actual dollars you spend depend on three choices: which plan you pick, which pharmacy you use, and whether you take brand-name or generic drugs. A plan with a low premium might have a high deductible. A plan with no deductible might charge more per month. Switching plans every year during the annual enrollment period (October 15 to December 7) is common because drug prices and plan costs change.

Key Takeaways

  • Medicare Part D premiums in 2025 range from roughly $7 to $100+ per month depending on the plan, and you choose a new plan every year during open enrollment.
  • Most plans have an annual deductible (often $0 to $500) before the plan starts paying for drugs, though some plans have no deductible at all.
  • After you reach $8,000 in combined out-of-pocket spending in 2025, your plan covers 95 percent of all remaining drug costs for the rest of that calendar year.
  • The same drug can cost different amounts at different pharmacies and under different plans, so comparing plans before enrollment saves money.
  • If you do not have Part D coverage when you first become may be able to access, you may pay a permanent penalty on your premium if you join later.

How premiums are set and what they cover

Each insurance company that offers Part D sets its own monthly premium. In 2025, premiums typically range from about $7 to over $100 per month, though the exact amount varies by plan, region, and the drugs covered. You pay the premium whether you fill a prescription that month or not.

The premium covers the plan's administrative costs and the insurer's share of your drug costs. It does not cover your deductible or your copayments — those are separate. If you receive Extra Help (a federal subsidy for people with lower incomes), your premium may be reduced or eliminated entirely.

Plans are grouped into five tiers: generic drugs (lowest cost), preferred brand-name drugs, non-preferred brand-name drugs, specialty drugs, and insulin. Your copayment or coinsurance amount depends on which tier your drug falls into and which plan you chose. A plan might charge $10 for a generic, $50 for a preferred brand, and $100 or more for a specialty drug.

Deductibles and how they work

Most Part D plans have an annual deductible — the amount you must pay out of your own pocket before the plan starts paying for drugs. In 2025, deductibles range from $0 to $545, depending on the plan. Some plans have no deductible at all, which means the plan starts sharing costs when ready.

Once you meet your deductible, you move into the initial coverage phase. During this phase, you and the plan share the cost of drugs. You typically pay a copayment (a fixed dollar amount like $10 or $50) or coinsurance (a percentage of the drug's cost, like 20 percent). The plan pays the rest.

Deductibles reset every January 1. If you reach your deductible in November, you will need to meet a new deductible the following January. Some people time their prescriptions to spread costs across two calendar years, though this strategy only works if your doctor agrees to delay a refill.

The coverage gap and catastrophic coverage

After you and your plan have paid a combined $11,000 toward your drugs in 2025, you enter the coverage gap (sometimes called the "donut hole"). In the gap, you pay a larger share of drug costs — typically 25 percent of the price of brand-name drugs and generics. The plan does not pay during this phase, but your out-of-pocket spending still counts toward your annual limit.

Once your total out-of-pocket spending reaches $8,000 in 2025, you leave the gap and enter catastrophic coverage. From that point forward, the plan covers 95 percent of all drug costs, and you pay only 5 percent (or a small copayment, whichever is higher) for the rest of the calendar year.

The gap exists because of how the law is written, but it affects fewer people each year as drug prices rise and the gap threshold increases. If you take expensive specialty drugs, you may move through the gap quickly. If you take only generic drugs, you might never reach the gap.

How to compare costs between plans

The Medicare Plan Finder tool (available at Medicare.gov) lets you enter your current drugs and pharmacies to see what each plan in your area would charge you. This is the most accurate way to compare because it shows your actual out-of-pocket cost, not just the premium.

When you compare, look at the total annual cost, not just the premium. A plan with a $15 monthly premium might cost you more overall if it has a high deductible and expensive copayments for your specific drugs. A plan with a $50 monthly premium might be cheaper if your drugs are on its preferred list and have low copayments.

Pharmacy choice matters too. Some plans have preferred pharmacies where copayments are lower. Mail-order pharmacies often charge less for 90-day supplies than retail pharmacies. If you use a specific pharmacy, check whether it is in the plan's network before you enroll.

Extra Help and other ways to lower your costs

Extra Help is a federal program that pays premiums, deductibles, and copayments for people with limited income and resources. In 2025, you may be may be able to access if your income is below roughly $21,000 per year (for an individual) or $28,000 (for a married couple), though these limits change yearly. You can explore through Social Security, your state Medicaid office, or online at SSA.gov.

If you may have access to for Extra Help, your premium may be free or very low, your deductible may be waived, and your copayments are capped at small amounts. This program can save you thousands of dollars per year.

Some drug manufacturers offer patient information programs that pay copayments or provide free drugs to people who cannot afford them. Your doctor or pharmacist can tell you whether your drug has such a program. Some nonprofits also help cover copayments for specific conditions.

Late enrollment penalties and when to join

If you delay joining Part D after you first become may be able to access, you may owe a permanent penalty on your premium for as long as you have Part D coverage. The penalty is calculated based on how many months you went without coverage and increases each year. For someone who waits one year to join, the penalty might be roughly $40 per month, and it never goes away.

You are may be able to access to join Part D when you turn 65 and enroll in Medicare, or when you first become may be able to access for Medicare due to disability or end-stage renal disease. You have a seven-month initial enrollment window. If you miss it and do not have other creditable drug coverage (like coverage from an employer or union), you will owe the penalty.

The annual open enrollment period runs from October 15 to December 7 each year. You can switch plans during this window without penalty, even if you already have Part D coverage. Many people switch every year to find the lowest cost for their current drugs.

Frequently Asked Questions

Can I use my Part D plan at any pharmacy?

Most plans have a network of preferred pharmacies where copayments are lowest. You can use out-of-network pharmacies, but you will pay more. Mail-order and specialty pharmacies are often included in the network. Check the plan's pharmacy list before you enroll to make sure your regular pharmacy is included.

What happens if my drug is not on my plan's formulary?

A formulary is the list of drugs a plan covers. If your drug is not on it, you can ask your doctor to request a formulary exception — the plan may approve coverage anyway, especially if you have tried other drugs that did not work. Some plans charge more for non-formulary drugs. Checking the formulary before you enroll prevents surprises.

Do I have to pay the full deductible before the plan pays anything?

Yes, with most plans. Once you meet the deductible, the plan starts sharing costs. Some plans have no deductible, so the plan pays from your first prescription. Deductibles reset every January 1, so timing prescriptions across years can sometimes lower your costs.

What if I cannot afford my copayments?

Talk to your pharmacist or doctor about generic alternatives, which usually cost less. Ask whether the drug manufacturer offers a patient information program. If you have low income, explore for Extra Help through Social Security. Some nonprofits and community health centers also help cover copayments.

Can I switch Part D plans if my costs go up?

Yes, during the annual open enrollment period (October 15 to December 7). You can also switch if you have a may have access to life event like moving to a new state, losing employer coverage, or becoming may be able to access for Extra Help. Outside these windows, you are locked into your plan for the calendar year.