The Basic Rules for Medicare Advantage Enrollment

To enroll in a Medicare Advantage plan, you must first be enrolled in Original Medicare (Part A and Part B). You also need to be a U.S. citizen or lawful permanent resident, live in the plan's service area, and be 65 or older — or under 65 if you have been receiving Social Security Disability Insurance (SSDI) for at least 24 months, or have end-stage renal disease (ESRD) or amyotrophic lateral sclerosis (ALS).

Unlike Original Medicare, which is available to anyone who meets the age and citizenship requirements, Medicare Advantage plans are offered by private insurance companies. Each plan sets its own service area, which means your address determines which plans you can join. A plan available in one county may not serve the next county over.

You do not need to pass a health exam or answer health questions to join most Medicare Advantage plans during the annual enrollment period. However, some plans with higher benefits may use medical underwriting, meaning they can ask about your health history before accepting you.

Key Takeaways

  • You must already have Medicare Part A and Part B before you can join a Medicare Advantage plan.
  • You must live in the plan's service area, which varies by county and by insurance company.
  • The main enrollment window is October 15 through December 7 each year, but you may have other chances to join if you experience certain life changes.
  • Most Medicare Advantage plans do not require a health exam during the annual enrollment period, but some plans can review your medical history.
  • If you have Original Medicare and prescription drug coverage through a separate plan, you can switch to a Medicare Advantage plan that includes drug coverage.

When You Can Enroll in a Medicare Advantage Plan

The main time to join a Medicare Advantage plan is during the Annual Enrollment Period (AEP), which runs from October 15 through December 7 each year. Coverage begins January 1 if you enroll by December 7. You can also switch from one Medicare Advantage plan to another during this same window.

If you are new to Medicare at 65, you have a seven-month window called your Initial Enrollment Period (IEP). This starts three months before the month you turn 65, includes the month you turn 65, and extends three months after. During this time, you can join any Medicare Advantage plan without waiting for the annual enrollment period.

You may also enroll outside these windows if you experience a may have access to Life Event. These include losing employer coverage, moving out of your plan's service area, getting married or divorced, or becoming a U.S. citizen. You typically have 60 days from the event to join a plan. Contact your plan or Medicare directly to report the change and confirm your enrollment window.

How Your Address Affects Which Plans You Can Join

Medicare Advantage plans operate in specific geographic areas. Before you can enroll, you must verify that your home address falls within the plan's service territory. A plan may serve your city but not your county, or serve one side of a county line but not the other.

If you move, your current plan may no longer serve your new address. When this happens, you have 60 days to switch to a different Medicare Advantage plan that does serve your new location. If you do not switch within 60 days, your coverage may end. Always check the service area map on the plan's website or call the plan directly before moving to confirm coverage at your new address.

You can search for plans available in your area by entering your zip code on Medicare.gov or by calling 1-800-MEDICARE. The search tool shows all Medicare Advantage plans, their service areas, and their benefits for your location.

Special Enrollment Periods and Exceptions

Certain situations allow you to enroll in or switch Medicare Advantage plans outside the annual enrollment period. These Special Enrollment Periods (SEPs) include losing health coverage through an employer, becoming a U.S. citizen, moving to a new service area, or experiencing other may have access to events. Each situation has its own rules and time limits, usually 60 days from the event.

If you have end-stage renal disease or ALS, you may have different enrollment rules. People with ESRD can enroll in Medicare Advantage plans during specific windows tied to their treatment start date. Those with ALS have a one-time opportunity to enroll. Contact Medicare at 1-800-MEDICARE to learn the exact dates that explore to your situation.

If you are under 65 and receiving SSDI, you become may be able to access for Medicare Advantage after 24 months on disability. Your enrollment window opens in the month you become may be able to access. You can enroll during the annual period or during a special enrollment window tied to your may be able to access date.

What Happens If You Miss the Enrollment important date

If you miss your Initial Enrollment Period when you first become may be able to access for Medicare, you may face a late enrollment penalty if you later join a Medicare Advantage plan. The penalty is a percentage of the plan's premium, calculated for each month you were may be able to access but not enrolled. This penalty stays with you for as long as you have that plan.

If you miss the Annual Enrollment Period, you cannot join a Medicare Advantage plan until the next October 15 unless you experience a may have access to life event. During the months you are not enrolled in any plan, you still have Original Medicare coverage if you are enrolled in Part A and Part B, but you may not have prescription drug coverage unless you have a separate Part D plan.

The exception is if you are still within your Initial Enrollment Period. That seven-month window overrides the annual enrollment period, so you can join a plan at any time during those seven months without waiting.

Prescription Drug Coverage and Plan Switching

If you currently have Original Medicare with a separate prescription drug plan (Part D), you can switch to a Medicare Advantage plan that includes drug coverage. When you do, your separate Part D coverage ends automatically. You do not need to cancel it yourself.

If you have Original Medicare without any drug coverage, joining a Medicare Advantage plan that includes drug benefits means you will have coverage starting January 1 (if you enroll by December 7). If you go without drug coverage for more than 63 days in a row, you may owe a late enrollment penalty when you eventually join a plan with drug benefits.

Some people keep Original Medicare and add a separate Medicare Advantage plan by mistake, thinking they are switching. You can only have one Medicare Advantage plan at a time. If you enroll in a new plan during the annual enrollment period, your old plan automatically ends on December 31.

Health Status and Pre-Existing Conditions

Medicare Advantage plans cannot deny you coverage or charge you more based on your health status or pre-existing conditions. During the Annual Enrollment Period, most plans must accept you without asking health questions or requiring a medical exam. This protection applies whether you are joining for the first time or switching from another plan.

Some Medicare Advantage plans with higher benefits — such as plans that offer vision, dental, or hearing coverage beyond what standard plans provide — may use medical underwriting. This means they can ask about your health history and may decline to cover certain conditions for a waiting period. These plans must clearly disclose their underwriting process before you enroll.

If a plan declines you during the annual enrollment period, you have the right to file a complaint with Medicare. You can also choose a different plan that will accept you without health questions. Contact 1-800-MEDICARE to report the issue and explore other options in your area.

Frequently Asked Questions

Do I have to switch from Original Medicare to Medicare Advantage?

No. Original Medicare remains available to you whether or not you join a Medicare Advantage plan. You can stay in Original Medicare for as long as you are enrolled in Part A and Part B. Some people prefer Original Medicare because it works nationwide and does not require you to use a specific network of doctors.

What if I move to a state where my plan does not operate?

When you move out of your plan's service area, you have 60 days to switch to a Medicare Advantage plan that serves your new location. If you do not switch within 60 days, your coverage ends. You can also switch back to Original Medicare during this time. Contact your plan or call 1-800-MEDICARE to confirm your options at your new address.

Can I enroll in a Medicare Advantage plan if I have a pre-existing condition?

Yes. Medicare Advantage plans cannot deny you coverage or charge more because of pre-existing conditions during the Annual Enrollment Period. Some plans with extra benefits may ask health questions, but they must disclose this before you enroll. If a plan declines you, you can choose a different plan or contact Medicare for help.

What if I am under 65 but receive disability benefits?

You become may be able to access for Medicare Advantage after you have been receiving SSDI for 24 months. Your enrollment window opens in the month you reach 24 months. You can enroll during the annual period or during a special enrollment window tied to your may be able to access date. Call 1-800-MEDICARE to confirm your exact enrollment dates.

Do I lose my Medicare Advantage coverage if I do not pay the premium?

Yes. If you do not pay your plan premium by the important date, your coverage can end. The plan must give you notice before they terminate your coverage, usually allowing a grace period of at least 30 days. If your coverage ends, you can switch to Original Medicare or another Medicare Advantage plan during a special enrollment period.