When weighing Medicare Plan F vs G, start with the one question that can settle the comparison immediately: are you eligible for Plan F? In most cases, you can buy a new Plan F only if you became eligible for Medicare before January 1, 2020.
If you qualified later, Plan G is typically the broadest Medigap option available for new enrollment. For those who are eligible for both, the benefits are nearly identical. Each plan helps cover Medicare-approved deductibles, coinsurance, and copayments, including the 20% Part B share that can add up after outpatient care.
The practical difference is the annual Part B deductible. Plan F pays it; with Plan G, you pay that deductible yourself before the plan begins covering Part B costs. Afterward, Plan G generally provides the same broad protection.
Use this checklist before you compare plans: confirm your Medicare eligibility date; request quotes for the same carrier rating area and plan type; subtract the annual Part B deductible from the premium difference; and ask whether rates are attained-age, issue-age, or community-rated.
A lower premium does not automatically mean lower long-term cost, particularly if the price gap is narrow. Also review enrollment timing. Your Medigap open enrollment period offers the strongest protections for buying a plan without medical underwriting.
Outside that window, switching from Plan F to Plan G may require health questions in many states. Review premiums and benefits annually, but do not assume a change is available or advantageous without checking your local options first.