You can sign up for a Medicare drug plan during the annual enrollment period, which runs from October 15 to December 7 each year

Medicare Part D is the prescription drug coverage that works alongside Original Medicare or Medicare Advantage. If you have Original Medicare and do not have drug coverage through another source — such as an employer or union — you will want to choose a plan during the enrollment window. The process itself is straightforward: you pick a plan, confirm your information, and submit your choice to Medicare. Most people complete it online in under 15 minutes.

The enrollment period is the same every year: October 15 through December 7. Coverage begins January 1 of the following year. If you miss this window and do not have a reason that qualifies you for a special enrollment period, you will have to wait until the next October to sign up. There is a penalty for late enrollment that stays with you as long as you have Medicare, so signing up on time matters.

Key Takeaways

  • The annual enrollment period for Medicare drug plans runs October 15 through December 7, and coverage starts January 1.
  • You can enroll online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at a local Social Security office.
  • You will need your Medicare card and information about the medications you currently take, including the dose and how often you take them.
  • Comparing plans before you choose matters because premiums, deductibles, and which drugs are covered vary significantly between plans.
  • If you miss the October 15 to December 7 window, you may still be able to enroll if you have a may have access to life event, such as losing employer coverage.

Gather your Medicare card and medication list before you start

Before you begin the enrollment process, collect two things: your Medicare card and a list of all the prescription medications you take. Your Medicare card has your Medicare number on it, which you will need to enter during enrollment. You can find your card in the mail or log into your Medicare account at Medicare.gov to view your number.

For your medication list, write down the name of each drug, the dose (for example, 10 mg), and how many times a day you take it. If you are not sure of the exact dose, bring the bottles themselves or call your pharmacy and ask them to read the label to you. This list helps you see which plans cover your drugs and at what cost. Plans differ in which medications they cover and how much you pay, so this step directly affects your out-of-pocket costs.

Compare plans using the Medicare Plan Finder tool

The Medicare Plan Finder is a free tool on Medicare.gov that shows you all the drug plans available in your area and estimates what you will pay for your specific medications under each plan. Go to Medicare.gov, click on "Find Care Providers and Plans," and select "Drug Plans." Enter your zip code, then type in each medication from your list. The tool will show you the monthly premium, annual deductible, and your estimated yearly cost for each plan.

Pay attention to three numbers: the premium (what you pay each month whether you fill prescriptions or not), the deductible (what you pay out of pocket before the plan starts to help), and your total estimated cost for the year. A plan with a low premium might have a high deductible, or vice versa. The plan that costs the least overall depends on how many prescriptions you fill and which drugs you take. Spend 10 to 15 minutes comparing at least three plans before you decide.

If you do not have internet access or prefer to talk through your options, you can call 1-800-MEDICARE and speak with a representative who will walk you through the Plan Finder over the phone. They can also mail you a printed comparison if you ask.

Enroll online, by phone, or in person

Once you have chosen a plan, you have three ways to enroll. The fastest is online at Medicare.gov: log in to your account, go to "Enrollment and Costs," and follow the steps to select your plan. You will confirm your personal information, choose your plan, and submit. You should receive a confirmation email within a few minutes.

If you prefer to enroll by phone, call 1-800-MEDICARE during business hours (the number is available 24/7, but live representatives are available 8 a.m. to 8 p.m. Eastern time, seven days a week). Have your Medicare card and the name of the plan you want to join ready when you call. The representative will enroll you over the phone and give you a confirmation number.

You can also enroll in person at your local Social Security office. Find the nearest office at ssa.gov or call 1-800-772-1213. Bring your Medicare card and the name of the plan you want. Social Security staff will help you complete the enrollment and give you a receipt.

Understand what happens after you enroll

After you enroll, Medicare will send you a confirmation letter in the mail within two weeks. This letter confirms which plan you chose and when your coverage begins (January 1 of the following year). Keep this letter in a safe place. Your new plan will also send you a member ID card before January 1; use this card when you fill prescriptions starting on your coverage date.

If you enrolled online or by phone, you can also log into your Medicare account at Medicare.gov to see your enrollment status and print your member ID card right away. Do not throw away your old Medicare card; you will still need it for other parts of Medicare, such as doctor visits.

Know what to do if you miss the enrollment important date

If October 15 to December 7 has passed and you do not have drug coverage, you may still be able to enroll if you have a may have access to life event. These include losing employer or union coverage, moving to a different state, getting married or divorced, or having a significant change in income. You have 63 days from the date of the event to enroll in a plan.

To enroll outside the regular period, call 1-800-MEDICARE and tell the representative what happened. They will verify that your event qualifies and help you enroll. If you do not have a may have access to event and you miss the important date, you will have to wait until the next October 15 to enroll. In the meantime, you may face a late enrollment penalty that increases your premium permanently.

Frequently Asked Questions

What if I already have drug coverage through my employer or a union?

If your employer or union provides drug coverage that is at least as good as Medicare Part D, you do not need to enroll in a Medicare drug plan. However, if that coverage ends, you will have 63 days to enroll in a Medicare plan without penalty. Keep documentation of your employer coverage in case Medicare asks for proof.

Can I change my drug plan after January 1?

No, not unless you have a may have access to life event. Once your coverage begins on January 1, you are locked into that plan until the next October 15 to December 7 enrollment period. The only exception is if you move to a different state, lose coverage, or have another may have access to event — then you have 63 days to switch.

What if my medication is not covered by the plan I chose?

Contact your plan's customer service number (on your member ID card) and ask about coverage options. Many plans allow you to request an exception if a drug is not on their formulary, or they may suggest a similar medication that is covered. Your doctor can also submit a request on your behalf.

Do I have to enroll every year?

No. Once you enroll in a plan, your coverage continues automatically each year unless you make a change during the enrollment period. However, you should review your plan each October to make sure it still covers your medications at a good price, because plans change their formularies and premiums every year.

What if I cannot afford the monthly premium?

You may be able to get help paying your premium through the Low-Income Subsidy program if your income and resources are below certain limits. Call 1-800-MEDICARE to see if you may have access to, or visit Medicare.gov and search for "Extra Help" to learn more about this program.