If you are in the Original Medicare plan you are able to buy a Medicare supplement plan and both of them would pay you their share of coverage. It is to be noted that the Medigap policies are private health insurance plans and the private insurance companies can only sell them and not by any government organizations. These plans are totally administered by the private insurance companies. But it is to be mentioned that though these plans are completely administered and sold by private insurance companies but still there are only 12 supplementary plans labeled A through L. All these plans have there separate policy coverage but the plans under the same letter cover must provide the same benefits. It means that no matter from which company you have bought the policy, they must provide the same coverage as provided by hr consultants the other companies, nothing more or nothing less.Let us start from part A. Part A Medigap plan is your hospital insurance. It helps you to pay for the medical treatment that you receive in a hospital or skilled nursing facility. It also covers some of your home health care and hospice care, if you are ill for a time being. Part B is that part of the insurance coverage that helps you pay for the medical services that are not covered by the Part A policy. It also includes the Doctors charge. It is rather helpful when you are having a Part A policy. Part C is that part of the insurance coverage or such a Medicare supplement plan that combines both Part A and B coverage. It also provides some additional services. The Part C Medicare supplement plan is offered only through Medicare approved private insurance companies.