You can change your Medicare Part D plan online during the annual enrollment period or certain life events

Medicare Part D (prescription drug coverage) lets you switch plans once a year during the Annual Enrollment Period, which runs from October 15 to December 7. You can make this change on Medicare.gov without calling anyone or visiting an office. If you've had a major life change — such as losing employer coverage, moving to a different state, or becoming may be able to access for Medicaid — you may be able to switch outside this window during a Special Enrollment Period.

The online process takes about 15 to 20 minutes if you have your current plan information and a list of your medications. You'll compare plans side by side, see what your costs would be under each one, and confirm your choice before the important date.

Key Takeaways

  • The Annual Enrollment Period runs October 15 to December 7 each year, and any changes you make take effect January 1.
  • You can change plans on Medicare.gov by logging into your account, finding the plan comparison tool, and selecting a new plan.
  • Have your current plan name, your pharmacy, and a list of all your medications ready before you start, so you can see what each new plan will cost you.
  • If you miss the October 15 important date but have had a may have access to life event, you may have a Special Enrollment Period lasting 60 days from the date of the event.
  • Once you switch plans, your old coverage ends on December 31 and your new plan begins January 1.

What you need before you start

Gather three things before you log into Medicare.gov. First, have your current Part D plan name and member ID number — this is on your insurance card or in any recent letters from your plan. Second, write down the name and location of the pharmacy where you fill most of your prescriptions, because costs vary by pharmacy. Third, list every medication you take, including the dose and how often you take it (for example, "metformin 500 mg twice daily").

If you don't have your medications written down, call your pharmacy or your current insurance plan and ask them to send you a list. This step matters because the same drug can cost very different amounts under different plans, and some plans may require you to try a cheaper medication first before covering the one your doctor prescribed.

Step-by-step: changing your plan on Medicare.gov

Step 1: Log in or create an account. Go to Medicare.gov and click "Log In" in the top right corner. If you already have a Medicare.gov account, enter your username and password. If you don't have an account, click "Create an Account" and follow the prompts — you'll need your Social Security number and date of birth.

Step 2: Go to the plan comparison tool. Once you're logged in, look for a section labeled "Change Plans" or "Compare Plans." During the Annual Enrollment Period, this option appears prominently on your dashboard. Click it.

Step 3: Enter your medications. The tool will ask you to list your current medications. Type in each drug name, dose, and frequency. As you type, the system will suggest matches — select the correct one from the dropdown. This step is important because the tool uses your medications to calculate what you'll actually pay under each plan.

Step 4: Select your pharmacy. The tool will ask where you fill prescriptions. Search for your pharmacy by name or location. If you use multiple pharmacies, add them all — the tool will show you costs at each one.

Step 5: Review plan options. The tool will show you a list of plans ranked by estimated yearly cost. You'll see the monthly premium, deductible, copays for your specific drugs, and whether your pharmacy is in the plan's network. Click on any plan to see full details.

Step 6: Choose and confirm. Once you've found a plan you want, click "Enroll" or "Select This Plan." Review the summary to make sure everything is correct — plan name, effective date (January 1), and your medications. Then click "Confirm" or "Complete Enrollment."

Step 7: Save your confirmation. Medicare will show you a confirmation number on screen. Write it down or take a screenshot. You'll also receive an email confirmation — save this too. Your new plan becomes active on January 1.

What happens after you enroll online

Once you confirm your new plan, your enrollment is complete. Your old Part D plan ends on December 31, and your new plan starts on January 1. You don't need to do anything else unless your new plan asks you to. Some plans may send you a welcome packet or new insurance card in the mail before January 1 — keep an eye out for it.

Starting January 1, use your new plan's insurance card at the pharmacy. If you don't receive a card by late December, call your new plan's customer service number (on Medicare.gov) and ask them to send one or provide a temporary member ID you can use.

If your new plan requires prior authorization for any of your medications — meaning the plan wants your doctor to confirm the drug is medically necessary — the plan will contact your doctor directly. You don't have to do this yourself, but it can take a few days. If you're running low on a medication that needs authorization, ask your doctor's office to send the request right away, or call your new plan to check the status.

Changing your plan outside the enrollment period

If you miss the October 15 to December 7 window, you can still change plans if you've had a may have access to life event. These include losing employer coverage, moving to a different state, becoming newly may be able to access for Medicaid or Extra Help, or having a death in your family. When a may have access to event happens, you have 60 days from the date of the event to change your plan.

To change plans during a Special Enrollment Period, log into Medicare.gov the same way you would during the annual period. The system will ask you to confirm the reason for your change and the date it happened. Have documentation ready — such as a letter from your former employer, a lease showing your new address, or a Medicaid approval letter — in case Medicare asks you to verify.

If you don't have a may have access to event and the annual enrollment period has closed, you're locked into your current plan until next October 15. The only exception is if you're in a trial period: if you enrolled in your current plan during this year's annual enrollment period, you have until January 31 to change your mind and switch to a different plan.

Troubleshooting common problems

You can't log into Medicare.gov. Click "Forgot Username?" or "Forgot Password?" on the login page and follow the prompts. You'll need to verify your identity using your Social Security number and date of birth. If you still can't access your account, call Medicare at 1-800-MEDICARE (1-800-633-4227) and ask them to help you reset your login.

Your medication isn't showing up in the tool. The tool searches by generic name first. If you know the generic name of your drug, try that instead of the brand name. For example, search for "lisinopril" instead of "Prinivil." If the drug still doesn't appear, call your new plan's customer service line once you've enrolled and ask them whether they cover it.

The cost estimates seem wrong. Cost estimates are based on the information you entered. If you listed the wrong dose or frequency, go back and correct it — the estimate will update. Remember that estimates don't include any discounts you might get through manufacturer programs or patient information programs, so your actual cost could be lower.

You enrolled but didn't receive a confirmation email. Check your spam folder first. If it's not there, log back into Medicare.gov and go to your account dashboard — your enrollment should show under "My Plans." If you see your new plan listed there, you're enrolled. Write down the confirmation number from your account for your records.

When to call for help instead of using the website

The online tool works well for most people, but some situations are easier to handle by phone. Call Medicare at 1-800-MEDICARE if you take medications that are hard to find in the tool, if you're not sure whether a plan covers a specific drug, if you have questions about costs, or if you're trying to change plans during a Special Enrollment Period and aren't sure whether your event qualifies.

You can also call your current Part D plan's customer service line — the number is on your insurance card — and ask them which other plans might be better for your medications. They can't tell you to switch, but they can give you information to help you decide.

If you need help in a language other than English, Medicare.gov offers interpretation services. When you call 1-800-MEDICARE, tell the representative your language, and they'll connect you with an interpreter at no cost.

Frequently Asked Questions

Can I change my Part D plan more than once a year?

No, unless you have a may have access to life event. During the Annual Enrollment Period (October 15 to December 7), you can change plans once. If you enroll in a plan during this period, you have until January 31 to change your mind and pick a different plan — but that's your only second chance. Outside the enrollment period, you can only switch if you've had a may have access to event like moving, losing coverage, or becoming may be able to access for Medicaid.

What if I enroll in a new plan but my doctor says it doesn't cover my medication?

Call your new plan when ready and ask about coverage options. Many plans will cover a different medication in the same drug class, or they may require prior authorization for your specific drug. If your plan won't cover what your doctor prescribed, you can file an appeal or switch back to your old plan if you're still within the 60-day Special Enrollment Period that follows any plan change.

Do I have to use the online tool, or can I enroll by phone?

You can do either. The online tool on Medicare.gov is fastest, but you can also call 1-800-MEDICARE and speak to a representative who will walk you through the process and enroll you over the phone. Some people find this easier, especially if they have complex medication needs or questions the online tool doesn't answer clearly.

What if I move to a different state after I enroll?

If you move after you've enrolled in a plan, check whether your new plan works in your new state. Some plans are regional and don't cover you outside their service area. If your plan doesn't work where you're moving, you have 60 days from your move date to change plans during a Special Enrollment Period. Have your new address and move-in date ready when you enroll.

Can I change my plan if I'm on Extra Help or Medicaid?

Yes. If you receive Extra Help (a program that pays Part D costs for people with low income), you can change plans during the Annual Enrollment Period just like anyone else. If you're on Medicaid, the rules vary by state — some states let you change plans anytime, while others follow the same October 15 to December 7 window. Call your state Medicaid office or 1-800-MEDICARE to find out what applies to you.