You can change Medicare Advantage plans once a year during the Annual Enrollment Period, which runs October 15 to December 7

Medicare Advantage plans lock you in for a calendar year. If you want to switch to a different plan — whether because your doctor left the network, your costs went up, or you found better coverage — you have a specific window to do it. That window is the Annual Enrollment Period (AEP), which happens every October 15 through December 7. Changes take effect January 1 of the following year.

Outside this window, you cannot switch plans unless you have a may have access to life event: you move out of your plan's service area, you lose other health coverage, you become may be able to access for Medicaid, or your plan leaves the market. If none of those explore to you, you are locked in until next October.

The process itself is straightforward — you contact your new plan directly, or Medicare, or your insurance broker — but the timing matters. If you wait until late November, you risk missing the important date. If you switch without understanding your new plan's network and costs, you may find yourself in the same situation next year.

Key Takeaways

  • You can switch Medicare Advantage plans only during October 15 to December 7 each year, and the change takes effect January 1.
  • Outside the Annual Enrollment Period, you can switch only if you move, lose coverage, gain Medicaid, or your plan is discontinued.
  • Before you switch, check whether your doctors and hospitals are in the new plan's network and compare out-of-pocket costs for your medications.
  • You can switch by calling your new plan, calling Medicare at 1-800-MEDICARE, or working with a licensed insurance broker.
  • Once you switch, your old plan coverage ends on December 31 and your new plan begins January 1.

How to switch during the Annual Enrollment Period

During AEP (October 15 to December 7), you have three ways to switch. The simplest is to call the plan you want to join directly. Most plans have enrollment specialists available during these months who can walk you through the switch over the phone. You will need your Medicare number, which is on your red, white, and blue Medicare card.

You can also call Medicare directly at 1-800-MEDICARE and ask to switch plans. A representative will confirm your information and enroll you in your new plan. This route works well if you are unsure which plan you want or if you want Medicare to walk you through your options.

A third option is to work with a licensed Medicare insurance broker. Brokers are paid by the insurance companies, not by you, so there is no cost to use one. They know the local plans, can compare networks and costs for your situation, and handle the paperwork. You can find brokers through Medicare.gov or by asking your doctor's office for a referral.

Whichever route you choose, your new coverage begins January 1. Your old plan ends December 31. You do not need to do anything to cancel your old plan — switching automatically disenrolls you.

What to check before you switch

Switching plans because of cost or coverage is common, but switching without checking the details first is how people end up unhappy. Before you enroll in a new plan, verify three things: whether your doctors are in the network, whether your hospitals are in the network, and whether your medications are covered at a price you can afford.

Most Medicare Advantage plans publish their provider directories online. Go to the plan's website, enter your doctor's name, and confirm they are listed as in-network. Do the same for any hospital or specialist you use regularly. If your doctor is not listed, call the plan's customer service number and ask whether they are accepting new Medicare Advantage patients. A doctor can be in the network but not taking new patients.

For medications, use the plan's formulary tool, also on their website. Enter each drug you take and check the tier — tier 1 is cheapest, tier 5 is most expensive. Some plans cover certain drugs only if you try a cheaper alternative first, a process called step therapy. If you are on a medication that requires step therapy and you do not want to switch drugs, that plan may not be right for you.

If you use mail-order or specialty pharmacies, confirm those are in the plan's pharmacy network too. Some plans restrict where you can fill prescriptions.

Switching outside the Annual Enrollment Period

If you need to switch plans outside of October 15 to December 7, you must have a may have access to event. Medicare calls this a may have access to Life Event (QLE). The most common ones are: you move to a county where your current plan does not operate; you lose other health coverage like employer insurance; you become newly may be able to access for Medicaid; or your plan is discontinued by the insurance company.

If you have a QLE, you have 60 days from the date of the event to switch plans. For example, if you move on March 15, you can switch plans anytime between March 15 and May 14. You must tell Medicare about the event when you enroll in your new plan. Have documentation ready: a lease or utility bill for a move, a letter from your employer for loss of coverage, or a Medicaid approval letter.

Call your new plan, Medicare at 1-800-MEDICARE, or a broker and mention your may have access to event. They will ask for proof and enroll you in your new plan. Your coverage usually begins the first of the month after you enroll, though some plans start coverage sooner.

Common mistakes to avoid when switching

The biggest mistake is waiting until December 5 or 6 to switch. The important date is December 7, but if you call late in the day, the plan may not be able to process your enrollment in time. Call by December 5 at the latest to be safe.

The second mistake is switching without checking your network. You find a plan with a lower premium and enroll, then in January you discover your cardiologist is not in the network. You cannot switch again until October. Check the network first.

A third mistake is not comparing out-of-pocket costs. Two plans may have the same premium but very different deductibles, copays, and coinsurance. If you have chronic conditions or take multiple medications, the plan with the lower premium may cost you thousands more out of pocket. Use the plan's cost calculator on their website or ask a broker to compare total costs for your situation.

Finally, do not assume your old plan will cover you after December 31. Once you switch, your old plan ends. If you have prescriptions to refill or appointments scheduled in early January, make sure your new plan is active and your doctors are in the network before the year ends.

What happens after you switch

After you enroll in your new plan, you will receive a confirmation letter within 7 to 10 days. This letter confirms your enrollment date and your new plan's customer service number. Keep it. Your new insurance card will arrive by December 20 or so, though some plans send it earlier.

In early January, your new plan becomes active. Use your new card at the doctor, hospital, and pharmacy. If you still have your old card, do not use it — it is no longer valid. If a provider tries to bill your old plan, contact your new plan's customer service and ask them to correct the claim.

If you have any questions about your new plan's coverage, costs, or network in those first weeks, call the customer service number on your new card. Plans are required to answer questions about coverage and costs. If you have a problem, you can also file a complaint with Medicare by calling 1-800-MEDICARE.

Frequently Asked Questions

Can I switch plans more than once during the Annual Enrollment Period?

Yes. You can switch multiple times between October 15 and December 7, and only your final enrollment counts. However, each switch takes time to process, so if you change your mind multiple times, your new card may not arrive by January 1. It is better to decide once and stick with it.

What if I realize my new plan is wrong after January 1?

You are locked in until October 15 unless you have a may have access to life event. If your new plan does not cover a medication you need or your doctor left the network, contact the plan's customer service when ready. Some plans have exceptions or can work with you on coverage. If the plan truly will not work, you may be able to file a complaint with Medicare that could allow an earlier switch, but this is rare.

Do I have to switch plans if my doctor leaves my current plan?

No, but you may want to. If your doctor leaves the network mid-year, your plan should notify you. You can stay in the plan and find a new doctor, or you can wait until October to switch. If your doctor is essential to your care, switching may be worth the wait.

Can a broker help me switch for free?

Yes. Licensed Medicare brokers are paid by insurance companies, not by you. They can compare plans, check your network, and enroll you at no cost. Make sure the broker is licensed by your state — you can verify this on your state's insurance department website.

What if I miss the December 7 important date?

You cannot switch until October 15 of the following year unless you have a may have access to life event. If you missed the important date by a day or two, call Medicare at 1-800-MEDICARE and explain. They cannot override the important date, but they can confirm whether your enrollment went through before the cutoff.