Medicare Supplement (Medigap) plans in South Carolina

Medicare Supplement insurance — usually called Medigap — is private coverage that pairs with Original Medicare (Parts A and B). Instead of replacing Medicare, it fills the gaps: the deductibles, copayments and coinsurance you’d otherwise pay yourself. You then add a standalone Part D drug plan for prescriptions. The South Carolina Department of Insurance regulates the policies and publishes a yearly shopper’s guide; the benefits inside each plan letter are set federally.

How Medigap is different from Advantage

The plans South Carolinians actually buy

Plan G covers everything Original Medicare leaves behind except the Part B deductible ($283 in 2026). Plan N costs less in exchange for small office and emergency copays and no coverage of Part B excess charges. High-deductible Plan G has a much lower premium and a deductible you pay first. Plan F still exists for people who were eligible before 2020 but cannot be sold to anyone newer. Because benefits are standardized, we compare companies on price and on how fast they have raised it.

When you can buy one without health questions

• Your six-month open enrollment. It starts the month you are 65 or older and enrolled in Part B. During it, every plan a company sells is guaranteed available regardless of health.
• Guaranteed-issue events. Losing an Advantage plan or employer coverage through no fault of your own, or moving out of your Advantage plan’s service area, gives you a window (generally 63 days) to buy certain plans without underwriting. If you are arriving in South Carolina from an Advantage plan up north, this is your door into a supplement; see moving to South Carolina.
• Under 65 on disability. South Carolina does not require insurers to offer Medigap to people under 65. Some carriers choose to, usually at a higher premium, and the state’s high-risk pool has offered guaranteed-issue Medigap options for people under 65 on Medicare. I-CARE (800-868-9095) and the Department of Insurance shopper’s guide list what is currently sold; a fresh open enrollment for every plan arrives at 65.
• Outside those windows, South Carolina insurers can use medical underwriting, and South Carolina has no birthday rule, anniversary rule or annual Medigap window. Switching later usually means answering health questions.

Compare the rate history, not just the first-year price

Because the benefits are standardized, the only real differences between South Carolina Medigap companies are what they charge and how steeply they raise it later. That second part is public: every carrier files its rate increases with the South Carolina Department of Insurance, and a policy that looks cheap at 65 can be the expensive one by 75. We publish that filing history on our research site, South Carolina Medigap rate history, with each figure tied to the filing it came from. If your premium has already gone up and you want to know why, why Medigap premiums increase covers the three causes — and in a state with no birthday rule, whether you can move to a cheaper carrier depends on your health, so ask before you cancel anything.

Who Medigap tends to suit

People who want maximum freedom to choose doctors and hospitals — MUSC or Prisma without a network question, a specialist at Duke or Emory from a rural county — predictable costs, and coverage that travels. That last point is why so many retirees who split the year keep a supplement. The cost is a monthly premium that rises with age and with the carrier’s filings.