Medicare Open Enrollment runs October 15 through December 7 each year

Open Enrollment is the one time each year when you can change your Medicare coverage without a penalty. During these eight weeks, you can switch between Original Medicare and Medicare Advantage plans, change your prescription drug plan, or drop coverage altogether. Outside this window, you cannot make changes unless you have a may have access to life event — and even then, your options are limited.

The dates are fixed: October 15 through December 7. Mark them on your calendar now. Any changes you make during Open Enrollment take effect January 1 of the following year. If you miss the important date, you are locked into your current plan for the rest of the year unless you experience a may have access to event like losing employer coverage, moving to a new state, or having a major change in income.

Key Takeaways

  • Open Enrollment happens every year from October 15 through December 7, and changes take effect January 1.
  • You can switch between Original Medicare and Medicare Advantage, change your prescription drug plan, or drop coverage during this window.
  • If you miss the important date, you cannot change plans until the following year unless you have a may have access to life event.
  • Medicare sends notices in September and October explaining plan changes and premium increases for the coming year.
  • You can compare plans online at Medicare.gov, by phone at 1-800-MEDICARE, or with a local counselor through your State Health Insurance information Program (SHIP).

What you can and cannot change during Open Enrollment

During Open Enrollment, you have broad freedom to restructure your coverage. You can switch from Original Medicare (Parts A and B) to a Medicare Advantage plan, or go the opposite direction. You can change which Medicare Advantage plan you use. You can add, drop, or switch prescription drug plans (Part D). You can also drop all supplemental coverage if you choose, though this is rarely advisable.

What you cannot do: you cannot change your Original Medicare coverage itself — Parts A and B are what they are. You also cannot make changes to your Medigap supplemental plan outside of certain limited windows (some states allow changes during Open Enrollment, but most do not). If you need to change a Medigap plan, you typically have a narrow window when you first turn 65 or when you first enroll in Medicare Advantage.

How to know if your plan is changing

In September and October, Medicare mails you a notice called "Medicare & You" along with plan-specific documents from your current insurer. These documents tell you whether your premiums are rising, whether your copays or deductibles are changing, and whether your plan is adding or dropping coverage areas or doctors. Read these carefully — they are your signal that you need to shop around.

Even if your plan sends no notice of changes, you should still review your coverage each year. Drug formularies (the list of medications your plan covers) change annually. Doctor and hospital networks shrink or expand. A plan that worked well last year may not work as well this year. The only way to know is to compare.

Where to compare plans and get information

Medicare.gov has a plan comparison tool where you can enter your medications, doctors, and hospitals and see which plans cover them. You can also call 1-800-MEDICARE (1-800-633-4227) and speak with a representative who can walk you through your options. Both services are free.

Your State Health Insurance information Program (SHIP) offers free, one-on-one counseling. SHIP counselors are trained to explain your options in plain language and help you compare specific plans. To find your state's SHIP, search "SHIP" plus your state name online, or call 1-800-MEDICARE and ask for the referral.

Some Medicare Advantage and Part D plans also send sales representatives to community centers, libraries, and senior centers during Open Enrollment. These sessions can be useful, but remember that the representative works for that plan and cannot show you options from other insurers.

What happens if you miss the important date

If October 15 passes and you have not made a change, your current plan renews automatically on January 1. You are then locked in for the rest of the year. The only way out is to experience a may have access to life event.

may have access to events include: losing employer coverage, moving to a different state, getting married or divorced, having a baby or adopting, losing Medicaid, or having a significant drop in income. If any of these happen, you have 60 days from the event to make a change. You will need to report the event to Medicare and provide documentation — usually a letter from your employer, a lease showing your new address, a marriage certificate, or a notice from your state Medicaid office.

Special enrollment periods for people with employer coverage

If you or your spouse still work and have employer health insurance, you may have different rules. Some employers allow their retirees to stay on the company plan instead of switching to Medicare. If that is your situation, you typically have a special window to enroll in Medicare when you or your spouse finally retires or the employer coverage ends.

If you are still working and covered by your employer's plan, you may not need to enroll in Medicare Parts A and B right away. However, you should contact Social Security or Medicare to understand your specific situation, because waiting too long can result in permanent penalties on your premiums.

Common mistakes to avoid during Open Enrollment

The biggest mistake is doing nothing. Many people assume their plan will work the same way next year and never look at the notices Medicare sends. Premiums rise, formularies change, and networks shrink every year. Spending an hour comparing plans can save you hundreds of dollars annually.

A second mistake is choosing based on premium alone. A plan with a $0 monthly premium might have high copays or a limited drug formulary. A plan with a higher premium might cover your medications and doctors better and cost less overall. Always calculate your total expected cost, not just the premium.

A third mistake is missing the December 7 important date. If you wait until December 8, you cannot change plans. Set a reminder for early December to make your decision and submit any paperwork. Most changes can be made online or by phone in minutes.

Frequently Asked Questions

Can I change my mind after I switch plans during Open Enrollment?

Yes, but only once. If you change plans during Open Enrollment and then change your mind, you can switch to a different plan one more time before December 7. After that, your choice is final and takes effect January 1. Plan carefully before making your second switch.

What if I turn 65 during Open Enrollment?

If you turn 65 during October or November, you have your own enrollment window that runs for seven months from the month you turn 65. This is separate from the general Open Enrollment period. You can enroll in Medicare during your personal window even if the general Open Enrollment has ended.

Do I have to change plans every year?

No. If your current plan still works for you and your costs are not rising significantly, you can keep it. However, you should review your coverage at least once a year to make sure your doctors and medications are still covered and that a different plan would not save you money.

Can I switch plans if I have a chronic condition?

Yes. Medicare Advantage plans cannot deny you coverage or charge you more based on your health status. You can switch to any plan available in your area during Open Enrollment, regardless of your medical history. However, check the plan's formulary to make sure your medications are covered before you switch.

What if my doctor is not in my new plan's network?

If you switch to a Medicare Advantage plan and your doctor is not in the network, you can usually see them out-of-network at a higher cost, or you can switch back to Original Medicare during the next Open Enrollment. Some plans also allow you to request an exception to cover an out-of-network doctor if you have an ongoing relationship with them.