Medicare supplement insurance is used to fill up gaps between the payment and uncovered expenses. As an example it covers for your deductible, co-payment, and co-insurance. Uncovered charges (e.g. deductibles, co-pays, prescriptions, and other expenses) can really add up when you get hospitalized. When you are ready to purchase a Medicare Supplement plan, there are a few steps that should be followed in order to ensure that you will be purchasing the coverage that is appropriate for your specific health insurance needs. By reviewing the different plans offered by these providers, you will be able to build a customized plan that gives you everything you really need, and nothing that you don't.