It can be confusing at first, partly because they're all identified by letter names (for example Plan A, Plan B, and so on) - and they're often mistaken for the similarly-named components of Medicare itself (Part A, Part C, and more). Again, the main differences relate to the trade-off between deductible amounts and premiums: pay more upfront to spend less later, or vice-versa. Plan benefits are standardized, however, so whether you choose a Plan M with one insurer or another, your coverage is the same.