Two of the most complete Medigap policies on the market, Plan C and Plan F, are not available to everyone who wants one. Anyone who became eligible for Medicare on or after January 1, 2020, cannot buy either plan for the first time, no matter how many years have passed since. CMS’s own consumer guide to Medigap draws the line at that exact date, splitting the Medicare population into two permanent groups with different shopping lists.
The Line Drawn at January 1, 2020
CMS’s Medigap consumer guide states the restriction without qualification: Plans C and F are “not available to people new to Medicare on or after Jan 1, 2020.” The date refers to when someone first became eligible for Medicare, not the date they happen to be shopping for a policy, so a person who turned 65 in 2019 and waited years to actually enroll in Medigap is treated differently from a person who turned 65 in 2021 and shopped for a policy right away.
The 2020 line was set nationally by federal policy, so it applies the same way in every state, even though Medigap itself is sold by private insurers and administered somewhat differently from one state to the next. A person moving between states after 2020 does not regain access to Plan C or Plan F simply by shopping in a new market; the eligibility-date restriction travels with the individual, not with the state selling the policy.
Two references for comparing what’s left: The 2027 Medicare Open Enrollment Decision Kit includes the switching stop signs section and a cost calculator spreadsheet that compares plans on cost, drugs and doctors, useful once Plan C or F is off the table and the remaining letters need a real side-by-side look. Open The 2027 Medicare Open Enrollment Decision Kit.
Who Still Qualifies for the Older Plans
The restriction only closes the door on first-time purchases. Someone who became eligible for Medicare before January 1, 2020, and already holds a Plan C or Plan F policy can keep it, and CMS’s guide does not describe any requirement to give it up. That same person can also still shop for a Plan C or Plan F policy for the first time, since the cutoff is based on Medicare eligibility date rather than on whether a policy was already purchased. The restriction is entirely about closing the plans to a new generation of Medicare beneficiaries, not about clawing back access from people who already qualified before the line was drawn.
That access generally runs through the same channels as any other Medigap purchase. Medicare.gov’s page on buying a Medigap policy describes a standard 6-month open enrollment period tied to when Part B coverage starts, and someone eligible before 2020 who is still inside or re-entering a qualifying window can use that same process to buy Plan C or Plan F, exactly as someone shopping for any other standardized letter would.
What Plan D and Plan G Offer Instead
CMS’s guide points people on the newer side of the line toward specific substitutes, noting that “Plan D or G serve as alternatives” for anyone shut out of C and F. Plans D and G are structured differently: they do not cover the Medicare Part B deductible the way C and F do, which is the core feature that made C and F the most complete, “first-dollar” style coverage on the standardized Medigap list. A member comparing D or G against what C or F used to offer is really comparing whether paying that one deductible out of pocket each year is worth a potentially lower monthly premium.
How the Restriction Interacts With Guaranteed-Issue Rights
The 2020 cutoff does not bend even when a separate guaranteed-issue right is in play, such as the right that applies when a Medicare Advantage plan leaves Medicare or a member’s area. Someone newly eligible for Medicare on or after January 1, 2020, who qualifies for that guaranteed-issue right is still limited to the plans available to their eligibility group, meaning Plan D or G rather than Plan C or F, even though the guaranteed-issue right itself removes medical underwriting. The date-based restriction and the guaranteed-issue right are two separate rules that both have to be satisfied at once.
Medicare.gov’s page on changing a Medigap policy describes guaranteed issue rights only as removing the medical-underwriting step, not as expanding which specific plan letters a person is allowed to buy. That is why two people can both have a valid guaranteed-issue right at the same moment and still end up shopping from different plan lists, one still eligible for C or F and one limited to D or G.
Why C and F Were Singled Out
Plan F, and to a lesser extent Plan C, stood out among Medigap options because they covered the Part B deductible entirely, leaving a policyholder with essentially no out-of-pocket cost at the point of care. That first-dollar design is the specific feature the 2020 cutoff targets; every other standardized Medigap letter available to newly eligible beneficiaries, including D and G, still requires paying that deductible before coverage kicks in. CMS’s guide frames the restriction as applying specifically to Plans C and F, not to Medigap coverage broadly, which is why someone newly eligible after 2020 still has a full menu of other standardized plans to choose from.
Shopping the List Left After Plan C and F
Being shut out of Plan C and Plan F does not mean a newly eligible Medicare beneficiary has fewer real options, but it does mean the shopping list looks different than it did for people who qualified before 2020, and confusing the two can lead to time spent comparing a plan that was never actually available in the first place.
The 2027 Medicare Open Enrollment Decision Kit walks through pricing extra benefits and Original Medicare vs. Medicare Advantage, both relevant once Plan D or G, rather than C or F, becomes the realistic comparison point.
Check which standardized plans actually apply with The 2027 Medicare Open Enrollment Decision Kit.
This article was produced with AI assistance and reviewed by a human editor, based on CMS’s own Medigap guidance.
