Original Medicare pays for much, but not all. Medicare supplement insurance policies, sold by private companies can help pay some of the remaining health care costs for covered services and supplies. Medicare Supplement Insurance Policies are also called Medigap policies. Some Medigap policies also offer coverage for services that Original Medicare doesn’t cover like medical care when you travel outside the U.S. However, they don’t cover long-term care, vision, dental care, hearing aids, eyeglasses, or private-duty nursing. Standardized Medigap Policies Medigap  policy follows federal and state laws designed to protect its clients, and they must be identified as “Medicare Supplement Insurance” . Insurance companies can sell you only a “standardized” policy identified in most states by letters    A through D, F, G and K through N. All policies offer the same basic benefits but some offer  additional  benefits so you can choose which o...