When Is the Medicare Open Enrollment Period?

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Medicare is a government health insurance program for people 65 and older as well as for people with certain disabilities and end-stage renal disease. In 2020, 62.6 million people were enrolled. Medicare consists of hospital insurance (Part A), medical insurance (Part B), and drug coverage (Part D), plus Medicare Advantage plans and Medigap policies.

Most people are eligible to enroll in Original Medicare (Parts A and B), Part D, and Medicare Advantage plans during their initial enrollment period when they turn 65. If you want to make changes to your existing coverage or add Part D drug coverage, open enrollment is the time to do so.

Learn when Medicare open enrollment is, and what you can and can’t do during this time.

Key Takeaways

  • Medicare open enrollment is from Oct. 15 through Dec. 7 each year.
  • During open enrollment, you can join, switch, or drop a Medicare Advantage plan or a Medicare drug plan.
  • The Medicare Advantage open enrollment period is from Jan. 1 to March 31 each year.
  • Your new coverage will begin on Jan. 1 as long as you enroll by Dec. 7 of the previous year.

The Purpose of Medicare Open Enrollment

There are multiple enrollment periods for Medicare, including initial enrollment, special enrollment, general enrollment, and open enrollment. What you can do during these periods differs and may depend on what plans you’re already enrolled in. Open enrollment is important because it’s the time of year during which you can make certain changes to your existing coverage—whether you have Parts A and/or B, or if you also have a Medicare Advantage plan. You can also switch to another Part D prescription drug plan—or add a plan if you didn’t enroll in Part D when you were first eligible.

What You Can Do During Open Enrollment

If you are already enrolled in Medicare Part A or Part B, you can add or drop a Part D prescription drug plan. You can also choose a different Part D drug plan if you’re unhappy with your current one. Additionally, you can switch from Original Medicare (Parts A and B) to a Medicare Advantage plan.

If you currently have a Medicare Advantage plan, you can choose a plan that better suits your needs. You can switch to another Medicare Advantage plan without drug coverage, for example, and vice versa. You can also switch to Original Medicare if you prefer. Be aware that if you go back to Original Medicare, you may not be able to get a Medigap policy, and you may want to separately purchase Part D drug coverage.

If you go 63 or more days without creditable prescription drug coverage once your initial enrollment period is over, and later you want Part D, you will be assessed a late enrollment penalty. The penalty is permanently added to your Part D premium and increases the longer you go without coverage.

Visit Medicare.gov/plan-compare to compare plans against your current one for coverage, price, providers, and other benefits.

What You Can’t Do During Open Enrollment

You can’t enroll in Parts A or B, and you can’t enroll in a Medicare Advantage plan if you don’t already have Original Medicare. You also can’t enroll in a Medigap plan. The best time to enroll in Parts A and B is often during your initial enrollment period or, for Medigap, during the Medigap open enrollment period (below). If you miss your initial enrollment period, you can enroll in Parts A, B, and D, or a Medicare Advantage plan, during the general enrollment period (Jan. 1 to March 31, each year). In that case, your coverage would start July 1 in the year you signed up.

When Is Medicare Open Enrollment?

Medicare open enrollment is from Oct. 15 to Dec. 7 each year. If you enroll by the deadline, your new coverage will begin Jan. 1 of the following year. In addition to the regular Medicare open enrollment period, there are designated “open enrollment” periods for Medicare Advantage and Medigap plans.

Medicare Advantage Open Enrollment

Medicare Advantage, also called Part C, is another way to get your Original Medicare (Parts A and B) and Part D benefits. These plans are offered by private insurers and provide your Part A and Part B coverages, often with enhanced benefits. Plans typically include drug coverage, as well. 

During both the Medicare open enrollment period and the Medicare Advantage open enrollment period, you can make changes to your existing Medicare Advantage plan. Namely, you can switch to a new Medicare Advantage plan or drop it and switch to Original Medicare.

The Medicare Advantage open enrollment period is from Jan. 1 to March 31 each year. Your new coverage will start on the first day of the month after the new plan receives your enrollment request.

Medigap Open Enrollment

Medigap, also known as Medicare supplement insurance, is an optional coverage that supplements your Part A and Part B coverage. It’s sold by private insurance companies and can help cover copayments, coinsurance, deductibles, and other benefits.

If you’re new to Medicare and buy a Medigap policy, it can’t cover the Part B deductible.

The Medigap open enrollment period begins the first day of the month in which you turn 65 and are enrolled in Medicare Part B. It lasts for six months. This is the best time to enroll in a Medigap plan because insurers are not allowed to consider any preexisting conditions you may have when pricing your plan—nor can they refuse to cover you because of preexisting conditions. If you don’t get coverage during this time, you’re not guaranteed a plan and you could pay more for it. Coverage for your Medigap plan generally starts the first day of the month after you apply.

What If You Miss Open Enrollment?

If you miss the open enrollment period and want to make changes to your policy, you’re in luck if you have a Medicare Advantage plan. The Medicare Advantage open enrollment period begins shortly after the regular open enrollment period closes. So if you miss the Dec. 7 deadline, you’ll get another chance from Jan. 1 to March 31 to switch or drop your Medicare Advantage plan.

But if you have Original Medicare and miss open enrollment, you’ll need to wait until the next open enrollment or until a special enrollment period to make changes to your plan.

A special enrollment period is triggered when you experience certain life events like moving or losing your current coverage.

Frequently Asked Questions (FAQs)

At what age do you qualify for Medicare enrollment?

Most people qualify for Medicare at age 65. You can enroll during your initial enrollment period, which is three months prior to the month you turn 65, your birth month, plus the three months after—for a total of seven months. If you’re receiving Social Security benefits, you’ll be automatically enrolled in Original Medicare when you turn 65.

If you missed the initial enrollment period, can you apply for Medicare during open enrollment?

You can apply for Part D drug prescription coverage during open enrollment if you didn’t purchase it during your initial enrollment period. But you can’t enroll in Parts A or B during open enrollment. You can make changes to your existing plan during Medicare open enrollment.

How much does Medicare cost?

Most people pay nothing for Part A (hospital insurance) and $148.50 per month for Part B (medical insurance). If you or your spouse did not pay Medicare taxes for long enough while working, you’ll need to pay either $259 or $472 each month for Part A. High earners can pay up to $504.90 each month for Part B.