Medigap is sometimes referred to also as Medicare Supplement. It is an insurance product which helps pay for the expenses of Medicare. Private insurance providers offer Medicare Supplement insurance policies which can be utilized to cover a variety of costs, including copays, deductibles, and deductibles. Only people who are covered by both Medicare A as well as B can buy these insurance policies. It is important to note that Medicare supplement policies are not all-inclusive - they are designed to help fill the gaps in the traditional Medicare coverage. It is vital to compare the costs and benefits of different Medicare supplements before you make the purchase.