Medicare Supplement plans are standardized across the nation. These plans are offered by private insurance companies, but plan types with the same letter offer all the same basic benefits regardless of location. Plan G offers all the same benefits as Plan F but does not cover your Part B deductible. Plan N offers all the same benefits as Plan F but does not cover your Part B deductible or Part B excess charges. It also covers the Medicare Part A deductible at 50 percent rather than 100 percent.