Medigap plans have been standardized by the federal government. This means that the only difference in plans offered by one insurance company is the monthly premium. You are eligible to purchase a Medicare supplement insurance plan if you are currently covered under Medicare Parts A and B, are about to turn 65 or are about to receive Part B coverage.
There are 11 Medigap plan options in total. They are labeled A, B, C, D, F, high-deductible F, G, K, L, M, and N. Medicare plans E, H, I, and J are no longer available.