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Medicare Supplement Insurance (Medigap) is extra insurance you can buy from a private insurance company to help pay your share of out-of-pocket costs in Original Medicare.
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You can only buy Medigap if you have Original Medicare.
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Generally, that means you have to sign up for Medicare Part A (Hospital Insurance) and Part B (Medical Insurance) before you can buy a Medigap policy.
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You get a 6-month “Medigap Open Enrollment” period, which starts the first month you have Medicare Part B and you’re 65 or older.
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During this time, you can enroll in any Medigap policy, and the insurance company can’t deny you coverage due to pre-existing health problems.
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After this period, you may not be able to buy a Medigap policy, or it may cost more.
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Your Medigap Open Enrollment Period is a one-time enrollment.
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It doesn’t repeat every year, like the Medicare Open Enrollment Period.
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All Medigap policies are standardized.
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This means policies with the same letter offer the same basic benefits no matter where you live or which insurance company you buy the policy from.
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There are 10 different types of Medigap plans offered in most states, named by letters: A-D, F, G, and K-N.
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Price is the only difference between plans with the same letter sold by different insurance companies.
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In some states, you may be able to buy another type of Medigap policy called Medicare SELECT*.
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If you buy a Medicare SELECT policy, you have the right to change your mind within 12 months and switch to a standard Medigap policy.
*Important: In Massachusetts, Minnesota, and Wisconsin, Medigap policies are standardized differently.​
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Every Medigap policy must follow federal and state laws designed to protect you.
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It’s essential to watch out for illegal practices by insurance companies and protect yourself when shopping for a Medigap policy.
From Medicare.Gov