Medicare Open Enrollment

The Medicare open enrollment period takes place every year from Oct. 15 to Dec. 7. During this time, you can switch between Original Medicare and Medicare Advantage, join a Part D prescription drug plan or make other coverage adjustments. Medigap has its own six-month special enrollment period.

What Is Medicare Open Enrollment?

Medicare open enrollment is a seven-week period each year when you can make changes to your current coverage. It takes place from Oct. 15 to Dec. 7.

The details of your Medicare plan can change each year. Costs can increase, and private companies may modify their list of in-network providers and pharmacies. Prescription drug coverage may also fluctuate.

Each year, Medicare gives you the chance to examine your current plan during open enrollment and, if necessary, switch to a new one that better suits your needs.

Changes made in open enrollment go into effect Jan. 1.

Did You Know?
The Medicare open enrollment period is also known as fall open enrollment or the annual election period.

Open enrollment is different from the initial enrollment period, or the seven-month window when you first become eligible for Medicare around your 65th birthday.

It also differs from the general enrollment period, which takes place from Jan. 1 to March 31. General enrollment allows you to sign up for Medicare Part A and/or Part B coverage if you did not do so during your initial enrollment period.

Instead, open enrollment is an annual opportunity for Medicare beneficiaries to reevaluate their current plan benefits rather than sign up for the first time.

During Medicare open enrollment, you can:
  • Switch from Original Medicare to Medicare Advantage, or vice versa.
  • Switch from one Medicare Advantage plan to another.
  • Switch from one Medicare Part D prescription drug plan to another.
  • Enroll in a Part D plan for the first time.
  • Drop your Part D plan completely.
Financial expert John Clark explains why it is important to speak to a licensed professional during the Medicare open enrollment period.

If you want to switch to a Medicare Advantage (Part C) plan, you must have Part A and Part B first. You must also live in the plan’s network.

Most people with end-stage renal disease cannot join a Medicare Advantage plan.

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Medicare Advantage Open Enrollment

There’s another chance to change Medicare Advantage plans from Jan. 1 to March 31.

Your options are more limited during this Medicare Advantage-specific open enrollment period.

You can still switch from one Medicare Advantage plan to another or drop your current Part C plan and return to Original Medicare.

If you decide to return to Original Medicare, you can also join a Part D prescription drug plan during this time.

The Medicare Advantage open enrollment period isn’t meant for people who already have Original Medicare coverage.

There are a few things you can’t do during the Medicare Advantage-specific enrollment period, including:
  • Switch from Original Medicare to a Medicare Advantage plan.
  • Join a Part D plan if you're in Original Medicare.
  • Switch from one Part D plan to another if you're enrolled in Original Medicare.

After your plan provider receives your request to join, your new coverage will begin the first day of the following month.

Medigap Open Enrollment

According to, you’re more likely to get a better, more affordable Medigap policy if you sign up during a special six-month open enrollment period.

Medicare supplemental insurance policies, or Medigap, are sold by private insurance companies and help pay for costs Original Medicare doesn’t cover, including coinsurance, deductibles and copayments.

The Medigap open enrollment period begins the month you turn 65 and enroll in Medicare Part B. It lasts six months.

It’s a one-time opportunity and can’t be repeated.

Medicare expert John Clark speaks to the importance of signing up for a Medigap plan when you are first eligible to avoid future eligibility issues.

During open enrollment, you can purchase any Medigap policy in your state, regardless of your current health status.

Once the six-month window closes, private insurers that administer Medigap plans can use medical underwriting to decide whether to accept your application.

In other words, you may not be able to purchase a Medigap policy later — or it might be too expensive.

However, there are some situations when you may qualify for guaranteed issue rights, or protections that prevent insurance companies from denying you a Medigap policy even after your open enrollment period ends.

This includes when a Medigap company goes out of business or commits fraud.

Frequently Asked Questions About Medicare Open Enrollment

When does Medicare open enrollment start?
Medicare fall open enrollment takes place from Oct. 15 to Dec. 7. Medicare Advantage open enrollment is Jan. 1 to March 31. Medigap open enrollment is a six-month window that begins the month you turn 65 and are enrolled in Medicare Part B.
When is Medicare Part D open enrollment?
You can sign up for a Part D plan or switch to a new prescription drug plan during the open enrollment period from Oct. 15 to Dec. 7.
Do I need to change Medicare plans?
It’s important to review your Medicare plans during open enrollment. Benefits and costs can change from year to year, so switching to a different plan may provide you with more affordable coverage.
Last Modified: September 29, 2021

5 Cited Research Articles

  1. (2020, March 1). Don’t wait: Medicare Advantage Open Enrollment ends March 31. Retrieved from
  2. (2019, September). Understanding Medicare Advantage & Prescription Drug Plan Enrollment Period. Retrieved from
  3. Centers for Medicare & Medicaid Services. (n.d.). Medicare Open Enrollment. Retrieved from
  4. (n.d.). Part A & Part B sign up periods. Retrieved from
  5. (n.d.). When can I buy a Medigap policy? Retrieved from