You can switch from Medicare Advantage to Medigap, but only during specific windows and under certain conditions

Medicare Advantage and Medigap are two different ways to cover costs that Original Medicare does not pay. If you have Medicare Advantage now and want to switch to Medigap instead, you can do it — but Medicare limits when you are allowed to make the change. The rules depend on how long you have had Medicare Advantage, whether you are still in your first year of coverage, and whether you have a valid reason to switch outside the normal enrollment periods.

The most important rule: if you switch from Medicare Advantage to Medigap after your first year of Medicare Advantage coverage, insurance companies can deny you or charge you more based on your health history. This is called underwriting, and it can make Medigap much more expensive or unavailable. Knowing when you can switch without this penalty is the difference between a smooth transition and a costly one.

Key Takeaways

  • You can switch to Medigap from Medicare Advantage during the Annual Enrollment Period (October 15 to December 7 each year) or during your first year of Medicare Advantage coverage without health questions.
  • If you switch after your first year of Medicare Advantage, insurance companies can ask about your health and may refuse to sell you Medigap or charge you higher premiums.
  • Certain life events — such as moving out of your plan's service area or losing employer coverage — may open a Special Enrollment Period that lets you switch without underwriting.
  • You must be enrolled in Original Medicare (not Medicare Advantage) before a Medigap policy can start, so timing your disenrollment from Medicare Advantage matters.
  • Medigap plans vary by state and insurance company, so comparing plans and premiums before you switch helps you avoid overpaying.

Switching during your first year of Medicare Advantage

If you have had Medicare Advantage for less than one year, you have the strongest protection when switching to Medigap. During this window, Medigap insurance companies cannot ask you health questions or charge you more because of your medical history. This period is called the Medigap Open Enrollment Period, and it lasts for six months from the date your Medicare Advantage coverage began.

To use this window, you must disenroll from Medicare Advantage during the Annual Enrollment Period (October 15 to December 7) or during a Special Enrollment Period if one applies to you. Once you disenroll, you become may be able to access to buy any Medigap plan offered in your state, and the insurance company must accept you at the standard rate. This is the safest time to switch, because your health history cannot be held against you.

Switching after your first year of Medicare Advantage

After you have been in Medicare Advantage for more than one year, switching to Medigap becomes riskier. Insurance companies can now ask detailed health questions and decide whether to sell you a policy at all. Some companies will refuse to cover you. Others will sell you a plan but charge you a higher premium because of your age or medical conditions. This underwriting process can take weeks and may result in rejection.

You can still switch during the Annual Enrollment Period (October 15 to December 7), but you will go through underwriting. Before you disenroll from Medicare Advantage, contact Medigap insurance companies directly and ask whether they will cover you and at what price. Do not assume you will be accepted. Some people find that Medigap costs so much more after underwriting that staying in Medicare Advantage is cheaper, even if they prefer Medigap's coverage model.

Special Enrollment Periods that protect you from underwriting

Certain life events open a Special Enrollment Period that lets you switch to Medigap without underwriting, even after your first year of Medicare Advantage. These events include moving out of your Medicare Advantage plan's service area, losing employer-sponsored coverage, or having your Medicare Advantage plan leave the market. If one of these events happens to you, you have a limited window — usually 60 days — to switch to Medigap without health questions.

The key is documenting the event. If you move, keep your new lease or utility bill. If your plan leaves the market, Medicare will send you a notice. If you lose employer coverage, get a letter from your employer or union. When you contact a Medigap company, tell them about the event and provide proof. This proof is what allows them to skip underwriting and sell you a plan at standard rates.

Not all life events trigger a Special Enrollment Period. Divorce, retirement, or straightforward changing your mind do not may have access to. Only specific circumstances listed by Medicare open this protection. If you are unsure whether your situation qualifies, call Medicare at 1-800-MEDICARE and ask.

How to time your disenrollment from Medicare Advantage

The order in which you disenroll from Medicare Advantage and enroll in Medigap matters. You cannot have both at the same time. The safest approach is to disenroll from Medicare Advantage first, then enroll in Medigap. Your Medicare Advantage coverage ends on the last day of the month in which you disenroll. Your Medigap coverage can start on the first day of the following month, creating a one-day gap in some cases.

To avoid any gap, disenroll from Medicare Advantage during the Annual Enrollment Period so that your coverage ends on December 31. Then enroll in Medigap so that it starts on January 1. This timing is clean and leaves no days uncovered. If you are switching outside the Annual Enrollment Period due to a Special Enrollment Period, contact your Medigap company and ask them to coordinate the start date with your Medicare Advantage end date.

Do not wait until after you disenroll to look for a Medigap plan. Research plans and get quotes before you make any changes to your Medicare Advantage coverage. This way you know what is available and what it costs before you commit to switching.

Medigap plans and premiums vary by state and company

Medigap plans are standardized by the federal government, meaning Plan G in one state covers the same things as Plan G in another state. However, the price you pay for Plan G varies widely depending on which insurance company sells it and where you live. A Plan G from one company might cost $150 a month while the same plan from another company costs $200 a month in the same city.

Before you switch, compare plans and prices from at least three insurance companies in your area. You can use the official Medicare Plan Finder tool at Medicare.gov, or contact companies directly. Ask for quotes for the same plan from each company so you can compare apples to apples. Also ask whether the company uses age-rated or community-rated pricing — age-rated plans cost more as you get older, while community-rated plans charge everyone the same regardless of age.

What happens if you cannot switch to Medigap

If you are past your first year of Medicare Advantage and a Medigap company denies you or charges you too much, you have other options. You can stay in Medicare Advantage, which must accept you regardless of health. You can also switch to a different Medicare Advantage plan during the Annual Enrollment Period. Some people find that a different Medicare Advantage plan offers better coverage or lower costs than their current plan.

Another option is to wait. If you are denied Medigap coverage now, you can try again during the next Annual Enrollment Period. Your health situation may improve, or you may find a company willing to cover you. There is no rule against explore multiple times. Some people are denied once and accepted by a different company the next year.

Frequently Asked Questions

What is the difference between Medicare Advantage and Medigap?

Medicare Advantage is an all-in-one plan run by a private insurance company that covers hospital, doctor, and prescription drug costs. Medigap is a supplement to Original Medicare that pays some of the costs that Original Medicare does not cover, such as copays and coinsurance. With Medigap, you use Original Medicare plus the supplement, not a private plan.

Can I switch back to Medicare Advantage after switching to Medigap?

Yes, you can switch back to Medicare Advantage during the Annual Enrollment Period. However, Medicare Advantage companies can use underwriting after your first year, just as Medigap companies can. You may be denied or charged more. There is no penalty for switching back and forth, but underwriting applies both directions after year one.

Do I lose my prescription drug coverage when I switch from Medicare Advantage to Medigap?

Yes. Medicare Advantage plans include prescription drug coverage. Medigap does not. When you switch to Medigap, you must enroll in a separate Part D prescription drug plan during the same enrollment period. If you do not enroll in Part D when you switch, you may face a penalty when you do enroll later.

What if my Medicare Advantage plan is leaving the market?

If your plan leaves, Medicare sends you a notice. You have a Special Enrollment Period to switch to another Medicare Advantage plan or to Medigap without underwriting. The notice tells you the important date. You do not have to wait for the Annual Enrollment Period. Contact a Medigap company and mention that your plan is leaving — this triggers the protection.

How long does it take to switch from Medicare Advantage to Medigap?

Disenrollment from Medicare Advantage takes effect on the last day of the month you request it. Medigap enrollment can start as soon as the first day of the next month. If you are going through underwriting, the Medigap company may take two to four weeks to approve you. Plan ahead and start the process at least six weeks before you want your Medigap coverage to begin.