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Medigap – Medicare supplement insurance

Insurance coverage that fills the gaps in Medicare’s plans

Medicare supplement insurance: Key takeaways

2020 Medicare enrollment datesBecause Original Medicare covers a significant portion of its recipients’ healthcare expenses, eligibility for Medicare is a welcome milestone. But for all that Medicare covers, its enrollees learn quickly that Original Medicare doesn’t pick up the tab for everything.

What is Medicare supplement insurance?

Medicare enrollees typically find that they need help with many Medicare expenses – including copayments, coinsurance, and deductibles, in addition to any medical expenses incurred during travel outside the United States and its territories. To cover those expenses, millions of people – more than a third of all Original Medicare beneficiaries – purchase Medicare supplement insurance, also known as Medigap. These plans are designed to fill in the gaps in Medicare and limit enrollees’ out-of-pocket exposure.

Learn more about Medigap plans.

Where can you buy Medigap coverage?

Medigap policies are available in every state, from private health insurance carriers. America’s Health Insurance Plans (AHIP) reported in 2019 that total Medigap enrollment in 2017 stood at 13.5 million – up from 11.6 million in 2014.

All Medigap insurers must abide by strict state and federal laws. In most states, Medigap carriers must offer standardized policies that are identified by the letters “A” through “N.” There are a total of ten different plan designs: A, B, C, D, F, G, K, L, M, and N, and although the price varies from one carrier to another, the plan benefits are the same from one state to another and from one carrier to another, within each letter. (As described below, Plans C and F are no longer available to newly eligible enrollees.) So all plan Gs, for example, offer the same benefits — regardless of where you live or what insurance carrier you use. (Medigap policies in Massachusetts, Minnesota, and Wisconsin are standardized in a different way.)

In some states, not all types of Medigap coverage will be available. In other states, you may be able to purchase Medicare SELECT – a Medigap policy that requires plan holders to use specific hospitals and, in some cases, specific doctors. Any of the ten Medigap plan designs can be offered as a Medicare SELECT plan, and they tend to be less expensive than typical Medigap policies due to the restricted network. If you choose a Medicare SELECT plan and use a provider that’s not in the network, your Medigap plan won’t pick up your Medicare out-of-pocket costs unless it’s an emergency.

It’s important to note that insurance companies offering Medigap policies are not required to offer every Medigap policy. However, if a carrier offers any Medigap policy, it is required to also offer at least Medigap Plan A, as well as either Plan D or Plan G if the enrollee is new to Medicare, and either Plan C or Plan F if the enrollee became eligible for Medicare prior to 2020.

Are there gaps in Medigap coverage?

Yes. Medigap plans are designed to cover some or all of the out-of-pocket expenses for services that Medicare covers. But they do not cover care that’s not covered at all by Medicare. The list of expenses that Medigap policies don’t cover includes long-term care in a nursing home, vision and dental care, hearing aids, eyeglasses, private-duty nursing care, or prescription drugs. (Plans purchased prior to 2006 were allowed to cover prescriptions, and if you’ve still got one of those plans, you’re allowed to keep it. But Medigap plans sold since 2006 cannot include prescription coverage.)

Also, Medigap policies aren’t compatible with the following types of coverage:

Finally, Medigap policies are for individuals only – not for couples or families. So if you and your spouse are both eligible for Medicare, you’ll each need to select an individual Medigap plan. (Some carriers offer a discount if both spouses select the same plan.)

Can new beneficiaries buy Medigap plans that cover the Part B deductible?

There are two Medigap plan designs – Plan F and Plan C – that cover the Medicare Part B deductible. As a result of HR2 (MACRA), which was signed into law in 2015, those plans are no longer available to people who weren’t already eligible for Medicare prior to 2020.

People who were already enrolled in Plan C and Plan F can keep their coverage. And people who were Medicare-eligible prior to the start of 2020 can still apply for Plan C or Plan F. (If they’re outside of their initial enrollment window, carriers will likely use medical underwriting to determine eligibility.)

But people who become eligible for Medicare in 2020 or beyond can no longer purchase Plan C or Plan F. The idea was to eliminate first-dollar coverage under Medigap plans in an effort to prevent over-utilization of healthcare (ie, ensure that enrollees have some “skin in the game” rather than having all of their costs covered by Medicare and supplemental coverage). So people who become eligible for Medicare in 2020 or later can still buy Medigap plans that cover nearly all of their out-of-pocket costs for Medicare-covered services, but they will have to pay the Part B deductible on their own if and when they need outpatient care.

As of 2020, the Part B deductible is $198. (The Part B deductible is a per-year charge, as Medicare’s benefit periods only apply to inpatient care under Medicare Part A.)

How do Medigap insurers set their prices?

The cost of a Medigap policy can vary with each insurance company. There are three ways in which insurers set Medigap rates:

  • With community-rated pricing, enrollees are charged the same premium regardless of age. So a 65-year-old enrollee will pay the same premium as an 85-year-old enrollee. Premiums can change over time, but they change by the same amount for all enrollees. There are eight states that require all Medigap plans to be community rated.
  • Issue-age-rated premiums are based on the age of the purchaser. So the older the person is at the time of purchase, the higher the premium, and that difference continues as long as they have the plan. For plans with this rating structure, it’s particularly important to enroll as soon as you’re eligible for Medicare coverage, because your premium will always be as low as possible that way.
  • With attained-age-rated pricing, the premium goes up as the insured person ages. These plans might be the least expensive option when you’re first eligible for coverage, since you’ll be among the youngest enrollees. But as you get older, the price will increase based on your age as well as factors like inflation and overall medical cost trends.

Be aware that Medigap plans in most states are only guaranteed issue during the six-month window that starts the month you turn 65 (or when you enroll in Medicare Part B, which might be after you turn 65 if you still had employer-sponsored coverage), and during limited special enrollment periods. There’s no annual open enrollment period like there is for Medicare Advantage, Medicare D, and Original Medicare.

If you don’t enroll during your initial enrollment period, you may have to pay a higher premium – or be declined altogether – if you’re in poor health, as carriers are allowed to use medical underwriting after your initial enrollment period has passed.

How can I pay less for Medigap coverage?

Make sure you enroll as soon as you’re eligible, in order to get coverage that’s guaranteed issue with no premium rate-ups based on your medical history.

Some Medigap carriers offer discounts that might apply to you. Some insurers offer discounts for women, non-smokers, married people, and for paying annually. States also offer a health insurance assistance program, providing up-to-date Medigap insurance information and a list of qualified private insurers. Check our state pages to find your state’s assistance program.


Is there a best time to purchase a Medigap policy?

The best window of time in which to buy a Medigap policy begins on the first day of the month in which you’re at least 65 and enrolled in Medicare A and B (you have to be enrolled in both Medicare A and B in order to get a Medigap plan). This is the start of your initial enrollment period, and it lasts for six months. Under federal rules, Medigap coverage in every state is guaranteed during this window.

If you’re eligible for Medicare because of a disability, the majority of the states offer at least some sort of guaranteed issue enrollment periods for those under 65. (In many cases the coverage is more expensive for those under 65. You can click on your state on this map to see how the rules work.) So it pays to research your state’s health care regulations. (Contact your state SHIP office or Department of Insurance for more details).

If you wait to buy a policy until after your initial enrollment period, your carrier generally has the option of denying the application or charging a higher premium based on the company’s underwriting requirements, as there is no federal requirement that Medigap plans be guaranteed-issue outside of the initial enrollment window and very limited special enrollment periods. But states can set their own regulations for Medigap plans:

  • In New York and Connecticut, Medigap plans are not medically underwritten, regardless of when an applicant enrolls.
  • In Massachusetts, there’s an annual guaranteed-issue Medigap open enrollment period each year, from February 1 through March 31.
  • In Maine, Medigap insurers must designate one month each year when Plan A is guaranteed issue, regardless of the applicant’s medical history.
  • Missouri‘s “anniversary rule” allows enrollees to switch from one Medigap insurer to another (as long as both plans are the same letter) on a guaranteed-issue basis during a window each year that extends for 30 days before and 30 days after the anniversary of when the plan was first purchased.
  • In California and Oregon, Medigap enrollees have a 30-day window each year, following the enrollee’s birthday, when he or she can switch to any other available Medigap plan that has equal or lesser benefits, without medical underwriting.
  • Washington State allows those already enrolled in Medigap plans to switch to another Medigap plan at any time, as long as they’ve had coverage for at least 90 days. Those with Medigap Plan A are limited to switching to only another Plan A. But people with Medigap Plans B through N can switch to any other Plan B through N.

Check with your state SHIP or your state’s Department of Insurance for more information about state-based regulations regarding Medigap.

Will I have to wait for my Medigap policy to take effect?

An insurer can’t make you wait for your coverage to start, but it can make you wait for coverage of a pre-existing condition – and may also refuse to cover your out-of-pocket costs for that pre-existing condition for up to six months during a pre-existing condition waiting period. That said, if you recently had “credible coverage” – or if you have guaranteed issue “Medigap protection” – you may be able to shorten or avoid entirely the waiting period.

For more information about Medigap, read Choosing a Medigap Policy: A Guide to Health Insurance for People with Medicare.


Louise Norris is an individual health insurance broker who has been writing about health insurance and health reform since 2006. She has written dozens of opinions and educational pieces about the Affordable Care Act for healthinsurance.org. Her state health exchange updates are regularly cited by media who cover health reform and by other health insurance experts.

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