Medicare automatically renews your coverage every January 1st unless you take action to change it

Your Medicare coverage does not expire and does not require you to reapply each year. If you do nothing, your current plan — whether Original Medicare, a Medicare Advantage plan, or a Medigap policy — stays in place and renews on January 1st. However, "automatic" does not mean "unchanged." Your plan's costs, coverage rules, and network of doctors can shift from year to year, and you may find a different plan works better for your situation.

The key dates to know are October 15 through December 7 each year. This is the Annual Enrollment Period, when you can switch plans, add or drop coverage, or make changes without penalty. If you miss this window and want to change plans, you will generally have to wait until the next October, unless a life event like moving or losing other insurance qualifies you for a Special Enrollment Period.

Key Takeaways

  • Your Medicare coverage renews automatically every January 1st with no action needed on your part.
  • Your plan's premiums, deductibles, and covered doctors or hospitals may change each year, so reviewing your options during open enrollment is worth your time.
  • You can switch plans, add coverage, or make changes only during the Annual Enrollment Period (October 15 to December 7) unless you have a may have access to life event.
  • If you miss the enrollment window and want to change plans, you will have to wait until the next October unless you may have access to for a Special Enrollment Period.
  • Certain changes — like dropping Medigap or switching from Original Medicare to Medicare Advantage — may have waiting periods or penalties if you do not act during the right window.

What happens on January 1st when your coverage renews

On January 1st, your current Medicare plan straightforward continues. Your coverage does not lapse, and you do not need to do anything to keep it active. If you are in Original Medicare, your Part A and Part B coverage stays the same. If you are in a Medicare Advantage plan or have a Medigap policy, that plan renews under the same contract you held the previous year.

What changes is the cost and sometimes the rules. Your monthly premium may go up or down. Your deductible, copay amounts, or out-of-pocket maximum may shift. If you are in a Medicare Advantage plan, the list of in-network doctors and hospitals may be different. Prescription drug coverage under Part D may have new formularies — the list of drugs your plan covers — and different tiers of cost-sharing. These changes take effect on January 1st, even if you did not actively choose to renew.

The Annual Enrollment Period and what you can change

Every year from October 15 through December 7, you have the right to make changes to your Medicare coverage. This window is called the Annual Enrollment Period, and it is the main time each year when you can switch plans without a penalty or waiting period.

During this period, you can:

  • Switch from Original Medicare to a Medicare Advantage plan
  • Switch from a Medicare Advantage plan back to Original Medicare
  • Change from one Medicare Advantage plan to another
  • Add or drop a Medigap policy
  • Add or change a Part D prescription drug plan
  • Switch from one Part D plan to another

Any changes you make during this period take effect on January 1st. You do not have to wait or pay a penalty for switching. If you do nothing during October 15 to December 7, your current plan renews automatically on January 1st.

What happens if you miss the enrollment window

If you do not make changes during the Annual Enrollment Period and want to switch plans later, you will generally have to wait until the next October. Medicare does not allow plan changes outside the enrollment window except in specific situations.

A Special Enrollment Period lets you change plans outside the normal window if you have a may have access to life event. These events include moving to a new state or county, losing other health insurance, getting married or divorced, having a baby, or becoming may be able to access for Medicaid. You typically have 60 days from the event to make changes. If you believe you have a may have access to event, contact Medicare at 1-800-MEDICARE to ask whether you can change plans now.

If you miss the enrollment window and do not have a may have access to event, you are locked into your current plan until the next October 15. This is why checking your plan each fall is important — waiting until January means you cannot change until the following year.

Penalties and waiting periods for certain changes

Most plan changes during the Annual Enrollment Period have no penalty. However, some moves carry consequences if you do not time them correctly.

If you are in Original Medicare and drop a Medigap policy, you may not be able to get the same coverage back later. Medigap insurers can deny you or charge more if you explore after your initial enrollment period. If you are thinking about dropping Medigap, talk to your doctor first to understand what your out-of-pocket costs will be under Original Medicare alone.

If you are in a Medicare Advantage plan and want to switch to Original Medicare plus Medigap, you have a limited window. You can make this switch during the Annual Enrollment Period, but if you wait and try to buy Medigap later, the insurer may deny you or charge a higher premium. The best time to buy Medigap is when you first turn 65 or when you switch from Medicare Advantage to Original Medicare during the enrollment period.

How to review your plan before January 1st

Even though your plan renews automatically, spending 30 minutes in October to review your options can save you money or headaches. Start by checking whether your current plan is still a good fit.

Go to Medicare.gov and use the Plan Finder tool. Enter your current medications, the doctors and hospitals you use, and your zip code. The tool will show you all available plans and estimate your costs for the year ahead. Compare your current plan's premium, deductible, and out-of-pocket maximum to other options. If a different plan covers your doctors, has lower costs, or includes drugs your current plan dropped, you can switch during the enrollment period.

You can also call 1-800-MEDICARE to speak with a representative who can walk you through your options. Many Area Agencies on Aging offer free counseling through the State Health Insurance information Program (SHIP). A counselor can review your specific situation and help you decide whether to stay with your current plan or switch.

What to do if your plan is no longer available

Occasionally, an insurance company stops offering a particular Medicare plan in your area. If this happens, Medicare will send you a notice by September 30th telling you that your plan is ending. You will be automatically moved to a different plan offered by the same company, or you will have the right to choose a new plan during a Special Enrollment Period.

If your plan is ending, you will receive a letter explaining what is happening and what your options are. Read this letter carefully. You can choose to stay with the replacement plan the company picked for you, or you can shop for a different plan during the Special Enrollment Period that applies in this situation. You will have until December 7th to make a choice. If you do nothing, you will be enrolled in the replacement plan on January 1st.

Frequently Asked Questions

Do I have to do anything to keep my Medicare coverage active?

No. Your coverage renews automatically on January 1st every year. You do not need to reapply, pay a new enrollment fee, or take any action to keep your plan active. If you want to change plans, you must act during the Annual Enrollment Period (October 15 to December 7).

What if I want to keep my current plan but the costs are going up?

You can stay in your current plan if you choose. However, if the higher costs concern you, use Medicare.gov's Plan Finder during October to see whether other plans in your area have lower premiums or out-of-pocket costs. You can switch to a different plan during the Annual Enrollment Period with no penalty.

Can I change my Medicare plan in January?

No. The Annual Enrollment Period ends on December 7th, and any changes you make take effect on January 1st. If you miss this important date, you cannot change plans until the next October unless you have a may have access to life event that opens a Special Enrollment Period.

What counts as a may have access to life event for a Special Enrollment Period?

Common may have access to events include moving to a new state or county, losing other health insurance, getting married or divorced, having a baby, or becoming may be able to access for Medicaid. You typically have 60 days from the event to make changes. Contact Medicare at 1-800-MEDICARE to confirm whether your situation qualifies.

What happens if I do not choose a new plan during open enrollment?

Your current plan renews automatically on January 1st. Your coverage does not end, but your costs and covered doctors may change. If you wanted to switch to a different plan, you will have to wait until the next October unless you have a may have access to life event.