Choosing the Medicare supplement, or Medigap plan, thatâs right for you can be a difficult task. As mentioned in a prior article the most common Medigap plans sold in Alabama are Plan A, Plan B, Plan F, Plan G and Plan N. Each of these plans are âstandardizedâ by Medicare. âStandardizedâ means that each of these individual plans must contain the same basic benefits regardless of the insurance company you purchase it from. For example, Plan G with company XYZ must contain the exact same benefits as Plan F with company WXY. The one thing that can be different is the premium each company charges for the exact same coverage.