If you have moderately frequent hospital or doctor visits, you may already know that Original Medicare comes with out-of-pocket costs. Medicare Supplement insurance, also known as Medigap plans, are aimed to work with Original Medicare (Medicare Part A and Part B). Medigap will fill in gaps in benefits left behind by Medicare by paying some of the out-of-pocket costs such as deductibles, copayments, and coinsurance.
Because Medigap plans are regulated by the U.S. federal government, the benefit of a particular Medigap plan is exactly the same, no matter the private insurer you choose. The differences are in the customer service and price of the plan.