Plan F provides the most comprehensive standardized benefits but is generally not available to people who became eligible for Medicare on or after January 1, 2020. Plan G covers most Medicare-approved cost-sharing after the Part B deductible, including Part B excess charges where applicable. Plan N covers many of the same costs as Plan G but may require copayments for certain office and emergency room visits and generally does not cover Part B excess charges.Benefits may vary by state, and premiums vary by insurance company.