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Learn How to Choose the Right Medigap Plan Skip to content

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How to Choose the Right Medigap Plan

Supplemental insurance helps bridge the gap of costs not covered by original Medicare

Cover the gap

Josh Dickinson

En español | Under Medicare, you face extra costs not covered by the program, particularly if you are a regular user of the health care system.

For roughly 25 percent of Medicare enrollees, one solution to covering those costs is buying a Medicare supplemental plan — commonly known as Medigap. These policies, sold by private insurers but under tight guidelines from state and federal governments, fill some of the gaps in health care costs that Medicare doesn’t cover. Medigap plans are only for people who have chosen original Medicare (parts A and B); they cannot be applied to a Medicare Advantage plan.

Learn more about your options with AARP's Medicare Made Easy Guide

Think a Medigap policy might be right for you? Then you have one more round of decision-making to complete. Here’s some guidance to help you choose wisely.

The catch

And it’s a big one. When you first enroll in Medicare (that is, during the seven-month initial enrollment period, or IEP), insurers offering Medigap policies cannot deny you coverage or charge you more for any preexisting conditions. After that, anything goes. For example, if you don’t buy a Medigap policy during your IEP but decide a year later that you want one after all, insurers may be able to turn you down based on your health status, or set prices higher due to a preexisting condition.

The message: To guarantee stable, ongoing Medigap coverage for years to come, the time to buy is when you first enroll in Medicare.  

The choices

The government has created 10 Medigap benefit designs. Each varies slightly in what it covers. To compare, go to and, under the Supplements & Other Insurance tab, click on How to Compare Medigap Policies. Details are there on a single chart.

Don’t get confused by the way these policies are named: You have your choice of Medigap policies A, B, C, D, F, G, K, L, M or N. These designations have nothing to do with which Medicare program you chose. 

Medigap plans are standardized, meaning that (for example) an A or F plan sold by one insurer covers the same things as an A or F plan sold by another insurer. Medigap plans are consistent in all but three states: Massachusetts, Minnesota and Wisconsin have their own standard policies. 

So how do the 10 policies differ? “Some are high deductible, some require higher cost-sharing and some cover more costs,” explains Mary Mealer, life and health manager in the Missouri Department of Insurance, Financial Institutions & Professional Registration. Consumers should “evaluate their individual situation as to what plan meets their needs and what they can afford,” Mealer says. 

Word Medigap on a piece of paper with a stethoscope and pills

What to focus on

The government’s comparison chart shows 10 different health care costs that could be covered by a Medigap policy. Some come into play more than others, so you should focus most on those big-ticket items. They include: 

  • Your 20 percent share of the cost of doctor visits
  • Your 20 percent share of the cost of lab tests and other outpatient services
  • The deductible for each time you are admitted to a hospital
  • The coinsurance costs of hospital stays, or stays in a skilled nursing facility after being in a hospital

There are other considerations as well. For example, while other plans cover 100 percent of Part B coinsurance, plans K and L have higher cost-sharing, but also an out-of-pocket limit. Once you’ve paid that amount, they cover 100 percent of covered services for the rest of the year. In 2019, the limit for the K plan is $5,560, and the L plan limit is $2,780. These limits increase each year, based on inflation.

Remember, Medigap does not cover prescription drugs or dental, vision or most other needs that original Medicare doesn’t cover.

Generally, Medigap Plan F is the most popular, as it is the most comprehensive. There are actually two F plans — one has a high deductible. So look at each option carefully.

What it will cost you

Nationwide, the average premium for the most popular Medigap F plan costs roughly $326 a month. There is also a high deductible F plan - $2,300 for 2019 -  and that premium averages about $68 a month. Premiums are based on three different pricing systems and vary widely based on where you live.   

  • Community rated: The same monthly premium is charged to everyone who has this policy, regardless of age.
  • Issue-age rated: This premium is based on your age when you first buy the policy. The younger you are, the lower the initial premium. Any premium increases in the future will not be based on your age.
  • Attained-age rated: This premium is initially based on your current age, but can increase as you get older.

Experts suggest that you ask a potential insurer which pricing system it uses before buying a Medigap policy. That way you’ll know whether to expect increases as you age.

Final considerations

Mealer suggests that consumers contact their state’s insurance department before signing to make sure the agent and company selling the policy are licensed by the state, and to find out that company’s complaint record. Each state has a State Health Insurance Assistance Program that can help you find this information. 

And remember: Changing a Medigap policy can be hard. Give the policy one last read to see if it covers not just your current needs, but potential future needs as well.

Editor’s note: This story has been updated to reflect current financial information.

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