To make things easier, the federal government standardized all Medicare Supplement plans. The letter of the alphabet (A, B, C, D, F, K, L, M, N, HD F, and HD G) determine your benefits, NOT the company you select. The price companies CHARGE can vary slightly or greatly (even if it’s the same plan letter). Also, if you start Medicare in 2020 and beyond, plans C and F are not available to you.