Medigap is Medicare Supplement Insurance that helps fill "gaps" in Original Medicare and is sold by private companies. Original Medicare pays for much, but not all, of the cost for covered health care services and supplies. A Medicare Supplement Insurance (Medigap) policy can help pay some of the remaining health care costs, like:

• Copayments
• Coinsurance
• Deductibles

Some Medigap policies also cover services that Original Medicare doesn't cover, like medical care when you travel outside the U.S. If you have Original Medicare and you buy a Medigap policy, here's what happens:

• Medicare will pay its share of the Medicare-approved amount for covered health care costs.
• Then, your Medigap policy pays its share.

8 things to know about Medigap policies

1. You must have Medicare Part A and Part B.
2. A Medicare Supplement policy is different from a Medicare Advantage Plan in that a Medicare Supplement policy supplements your Original Medicare benefits by filling in all or some of the medical costs not covered by Original Medicare, and Medicare Advantage plans combine Original Medicare and sometimes Part D (Prescription Drug coverage) into a single plan and usually include additional benefits that are not covered by Original Medicare, such as routine vision (for eyewear) and hearing exams.
3. You pay the private insurance company a monthly premium for your Medigap policy. You pay this monthly premium in addition to the monthly Part B premium that you pay to Medicare.
4. A Medigap policy only covers one person. If you and your spouse both want Medigap coverage, you'll each have to buy separate policies.
5. You can buy a Medigap policy from any insurance company that's licensed in your state to sell one.
6. Any standardized Medigap policy is guaranteed renewable even if you have health problems. This means the insurance company can't cancel your Medigap policy as long as you pay the premium.
7. Some Medigap policies sold in the past cover prescription drugs. But, Medigap policies sold after January 1, 2006 aren't allowed to include prescription drug coverage. If you want prescription drug coverage, you can join a Medicare Prescription Drug Plan (Part D).
8. It's illegal for anyone to sell you a Medigap policy if you have a Medicare Advantage Plan, unless you're switching back to Original Medicare.

Medigap policies don't cover everything

Medigap policies generally don't cover long-term care, vision or dental care, hearing aids, eyeglasses, or private-duty nursing.

Insurance plans that aren't Medigap

Some types of insurance aren't Medigap plans, they include:

• Medicare Advantage Plans (like an HMO, PPO, or Private Fee-for-Service Plan)
• Medicare Prescription Drug Plans
• Medicaid
• Employer or union plans, including the Federal Employees Health Benefits Program (FEHBP)
• TRICARE
• Veterans' benefits
• Long-term care insurance policies
• Indian Health Service, Tribal, and Urban Indian Health plans

Dropping your entire Medigap policy (not just the drug coverage)

You may want a completely different Medigap policy (not just your old Medigap policy without the prescription drug coverage). Or, you might decide to switch to a Medicare Advantage Plan that offers prescription drug coverage.

If you decide to drop your entire Medigap policy, you need to be careful about the timing. When you join a new Medicare drug plan, you pay a late enrollment penalty if one of these applies:

• You drop your entire Medigap policy and the drug coverage wasn't creditable prescription drug coverage
• You go 63 days or more in a row before your new Medicare drug coverage begins
• Call your State Health Insurance Assistance Program (SHIP).
• Call your State Insurance Department.

Find out more about Medigap policies by following this link to Medicare.Gov What's Medicare Supplement Insurance (Medigap)?

Medicare started offering insurance coverage for prescription drugs through Medicare prescriptions drug plans and other health plan options. Medicare's prescription drug coverage will typically pay over half of your drug costs, for a monthly premium. (see Medicare Part D)

Part A is Hospital Insurance and covers cost associated with confinement in a hospital or skilled nursing facility. (see Medicare Part A)