Medicare Supplement Insurance Plans

Fact Checked
Contributing expert: Ron Elledge, Medicare consultant
Reviewed by: Kelly Blackwell, Certified Senior Advisor®
Updated: September 30, 2021

A Medicare Supplement Insurance plan can help with health care expenses not covered by Medicare. Find out if a Medigap policy makes sense for you.

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Ron Elledge
Medicare Consultant and Author
Ron Elledge
Medicare Consultant and Author

Ron Elledge is a seasoned Medicare consultant and author of “Medicare Made Easy.” As a Medicare expert, he regularly consults beneficiaries on Medicare rules, regulations, and strategies.

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Kelly Blackwell
Certified Senior Advisor (CSA)®
Kelly Blackwell
Certified Senior Advisor (CSA)®

Kelly Blackwell is a Certified Senior Advisor (CSA)®. She has been a healthcare professional for over 30 years, with experience working as a bedside nurse and as a Clinical Manager. She has a passion for educating, assisting and advising seniors throughout the healthcare process.

Medicare Supplement Insurance plans are offered by Medicare-approved private insurance companies to help bridge the gap between the charges you pay and what is covered by Medicare. While Medicare pays for a large percentage of the health care services and supplies you may need, you are still responsible for a portion of the costs..Medicare Supplement Insurance plans help fill in most missing gaps in coverage of costs..

Medicare Supplement Insurance plans are often referred to as Medigap policies because they fill the gap between what Medicare pays and and what you pay for Medicare-covered health care services.. Many people use Medigap policies to help cover the costs of associated health care expenses, such as coinsurance payments, copays, and deductibles. Some Medigap policies offer extra coverage for foreign travel health emergencies.

Understanding Medicare Supplement Insurance Plans

  • Medicare Supplement Insurance plans are private insurance plans that can help fill in gaps in Medicare coverage of costs for your health care service and supplies.
  • In order to purchase a Medicare Supplement Insurance plan, you must first be enrolled in Medicare Part A and Part B.
  • Medicare Supplement Insurance plans carry a monthly premium that must be paid separately from any Medicare premiums.
  • Medicare Supplement Insurance plans are standardized across the country, but premiums vary depending on the state and the insurance carrier.
  • You can not be enrolled in a Medicare Advantage Plan and a Medigap policy.

What Coverage do Medicare Supplement Plans Offer?

The specific coverage that Medicare Supplement plans offer varies based on the plan you purchase. offers an in-depth look at the precise coverage of each plan. In general, Medigap policies will either fully cover, partially cover, or not cover the following services and supplies:

  • Part A coinsurance and hospital costs up to an additional 365 days after Medicare benefits are used up
  • Part B coinsurance or copayment
  • The first three pints of blood
  • Part A hospice care coinsurance or copayment
  • Skilled nursing facility care coinsurance
  • Part A deductible
  • Part B deductible
  • Part B excess charges
  • Foreign travel emergency services
  • Out-of-pocket limit


High-deductible plans Medigap also offers high-deductible plans in some states. If you choose a high-deductible plan, you pay the $2,370 deductible (in 2021) before the policy kicks in. However, the high-deductible plans C and F aren’t available to anyone who is newly eligible for Medicare on or after January 1, 2020.
Medicare Part B deductible While Medigap can help cover the costs of deductibles, the one caveat to be aware of with Medigap plans is that they can not be used to cover your Part B deductible if you are newly eligible for Medicare. This means that if you are newly eligible for Medicare as of January 1, 2020, you will not be able to purchase Medigap plans C or F. However, if you were eligible for Medicare before January 1, 2020, but haven’t yet enrolled in Medicare, you may be able to purchase one of the plans that cover the Part B deductible. Additionally, if you were eligible before that January 1 deadline and are already enrolled in Plans C, F, or Plan F with the high deductible, you can keep your plan.
Part D prescription drug coverage Current Medigap policies do not cover prescription drugs. In the past, before January 1, 2006, some Medigap policies offered prescription drug coverage, but current plans do not.To obtain prescription drug coverage, you can join a Medicare Part D prescription drug plan. It is possible to purchase a Medigap policy and a Medicare drug plan from the same private company, but you may be responsible for paying both premiums separately.

What’s Not Covered by Medigap Policies

In general, Medigap plans do not cover long-term care, vision or dental care, hearing aids and eyeglasses or private-duty nursing.

Medigap policies differ if you live in Wisconsin, Massachusetts, or Minnesota. These states standardize their Medigap policies differently than the other states, and may include policies for basic and extended care.

How do Medicare Supplement Plans and Original Medicare Work Together?

When you purchase a Medicare Supplement Insurance plan, your Medigap policy will serve as a secondary source of insurance. That means Medicare will be used first to pay for any Medicare-approved costs for healthcare supplies and services. After Medicare has been applied, then your Medigap policy will be charged.

In most cases, there is nothing additional you need to do to submit a claim to your Medigap plan, as most doctors and healthcare facilities will automatically bill your Medigap plan.

Are There Additional Benefits to Medicare Supplement Plans?

Other benefits of Medicare Supplement Insurance plans include:


Travel coverage outside of the U.S.

Unlike Original Medicare, Medicare Supplement Insurance plans offer the advantage of additional coverage for emergency health care when you are outside of the U.S. For instance, Medigap Plans C, D, F, G, M, and N offer foreign travel emergency health care coverage if you are traveling outside of the U.S. There are also additional Medigap policies that are no longer for sale, but if you are already enrolled in them, they cover you for emergency care while traveling as well.

Medigap policies that cover emergency health care with foreign travel have a lifetime limit of $50,000, and coverage only applies if it begins during the first 60 days of your trip and if no charges are eligible to be covered by Medicare first.Your Medigap policy will only pay 80% of the billed charges for medically necessary emergency care providing you pay your $250 yearly deductible. The $250 deductible for foreign travel coverage is a separate deductible from any regular deductible your plan stipulates.

Guaranteed renewable Another benefit of a Medicare Supplement plan is that it ensures that your plan is guaranteed renewable, even if you have health problems. Providing you are paying your monthly premiums, your Medigap policy can’t be canceled due to any existing or new health conditions.

Who Qualifies for Medicare Supplement Plans?

You are eligible to purchase a Medicare Supplement plan if you’re enrolled in Original Medicare. If you choose to join a Medicare Supplement plan, you should do so during your six-month open enrollment period, which is the initial six months when you first become eligible for Medicare. It starts the month you turn 65 and as soon as you are signed up for Medicare Part B. The benefit of enrolling in a Medigap policy during the open enrollment period is that you are guaranteed coverage to purchase, no matter your health conditions , and you may lock in at a lower price and premium. After your enrollment period is over, you may have more difficulty finding coverage based on your health conditions, and your costs and premiums may be higher as well.

There are certain situations which may give you guaranteed issue rights to purchase a Medigap policy, regardless of your health conditions or any preexisting health conditions.

These include:

  • Moving out of the coverage area while in a Medicare Advantage Plan or Medicare SELECT Plan
  • Your existing Medicare Advantage Plan leaving Medicare coverage
  • Your other insurance plan outside of Medicare is ending
  • You are within your trial right period
  • Your plan coverage ends through no fault of your own

To be eligible to purchase a Medicare Supplement Insurance plan, you must first be enrolled in Medicare Parts A and B and not be enrolled in a Medicare Advantage Plan. It’s illegal for an insurance company to sell you a Medigap policy if you’re already on a Medicare Advantage Plan.

The one exception to this would be if you’re in the process of switching back to Original Medicare out of a Medicare Advantage Plan. You have the right to switch out of a Medicare Advantage Plan within 12 months of purchasing a plan for the first time, return to Original Medicare and purchase Medigap plan. You may also be eligible to drop a Medicare Advantage Plan and buy a Medigap policy at other times, but you’ll have to speak to your company directly to see if it is possible..

Medigap plans are individual plans, so if you have a spouse, both you and your spouse will have to purchase separate plans. You can find and compare Medigap plans and costs at

How Much do Medicare Supplement Plans Cost?

A Medicare Supplement Insurance plan will have a monthly premium cost that you pay to the private insurance company through which you purchased the plan. You’ll pay your monthly Medigap policy premium separately from any Medicare premiums.

Costs can vary widely for Medicare Supplement plans because they are offered through private insurance companies. You can compare costs from each company based on what kind of coverage you will need. You can purchase a Medigap policy from a licensed insurance company in your state.

In general, however, there are three ways that Medigap policies are priced:


Plan Pricing
Community-rated (no-age rated) This group of Medigap policies does not charge premiums based on age. Everyone in the policy gets charged the same premium number, regardless of their age.
Issue-age rated (entry-age rated) These plans are priced based on the age you are when you purchase your Medigap policy. The premium price you pay is lower the younger you are when you purchase and that premium is one you will “lock” into as soon as you enroll. In other words, the premium won’t change as a result of your age once you are locked in (although inflation and other factors may increase the premium costs over time).
Attained-age rated This plan sees your monthly premiums increase as your age increases. Younger customers will have lower premium costs that will increase yearly as they age.

Other variables that may affect the cost of a Medigap policy include certain discounts that individual plan companies may offer, such as discounts for people who do not smoke, married couples, multi-policy discounts, and electronic payment discounts.

There are also high-deductible plan options for Plans F and G, which will carry higher deductibles than the other plans. If you choose plans F and G, you will be responsible for the first $2,370 costs of deductibles, copayments, and coinsurance costs that  Medicare doesn’t pay before your Medigap policy kicks in. The other costs to Medigap include the $250 foreign travel deductible, if you utilize it. Because Medigap policies do not include prescription drug coverage, you may have to pay a late enrollment penalty if you do not enroll in Medicare Part D prescription drug coverage when you first become eligible.

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