If you live in South Carolina and you have been searching for how and when to change your Medicare Advantage or Medigap plan, you have probably found confusing answers, because the rules depend on which type of plan you have. Here is a clear South Carolina-specific guide that separates the two, with the federal windows that apply everywhere and what to check for South Carolina in particular.
The quick answer for South Carolina
- Medicare Advantage: you can generally change during the Annual Enrollment Period (October 15 to December 7), during the Medicare Advantage Open Enrollment Period (January 1 to March 31) if you are already in an Advantage plan, or during a Special Enrollment Period if you qualify. These windows are set by Medicare, so they are the same in South Carolina as in every state.
- Medigap: there is no annual deadline, but whether you can switch without health questions depends on protections that include some state rules. See below for what we found for South Carolina.
Medicare Advantage changes in South Carolina
- Annual Enrollment Period (Oct 15 – Dec 7). Change plans for the following January 1. See our Annual Enrollment guide.
- Medicare Advantage Open Enrollment (Jan 1 – Mar 31). If you are already in an Advantage plan, you get one change. Read the full guide.
- Special Enrollment Periods. Triggered by moving to a new area, losing other coverage, your plan ending, or qualifying for Extra Help or Medicaid, among others. See when you can switch plans.
Medigap changes in South Carolina
In the recent 2026 sources we reviewed, South Carolina was not listed as having a Medigap birthday rule. That generally means that outside your Medigap Open Enrollment Period and federal guaranteed-issue situations, an insurer may ask health questions when you apply to change plans. Rules can change, so confirm with the South Carolina Department of Insurance, and do not end your current plan until a new one is approved.
Regardless of state, you generally have protection in your six-month Medigap Open Enrollment Period and in certain federal guaranteed-issue situations. Our national guide, when can I change my Medigap plan, explains each one.
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Get my plan reviewWhat to think about in South Carolina
South Carolina draws many retirees to the coast and to growing inland metros, and many people split time between South Carolina and another state. If you are a part-year resident, check how each plan handles care outside its service area. Plan availability varies by county, so compare options at your primary address and confirm that the hospitals you use are in network. We serve people in and around Charleston, Columbia, Greenville, Myrtle Beach and Hilton Head, and we handle everything by phone.
Common situations people ask about
- "My doctor left my plan's network." You may qualify for a Special Enrollment Period in some cases, and you can compare plans at the next window. See what to do when a plan drops your doctor.
- "My premium or drug costs went up." Review your Annual Notice of Change and compare during the next open window.
- "I moved within South Carolina." A move to a different county can change which plans you can choose, and may open a Special Enrollment Period.
- "I want to move from Advantage back to Original Medicare." Check your Medigap options before you cancel. Read leaving Medicare Advantage.
- "I have both Medicare and Medicaid." You may have more frequent change opportunities. See Medicaid and dual-eligible options.
- "I split time between South Carolina and another state." Ask how the plan covers care outside its service area before you rely on it.
A checklist before you change anything in South Carolina
- Identify which window you are in (AEP, MA-OEP, SEP, or Medigap rules).
- List your doctors, hospitals, pharmacies, and medications.
- Check each against the plan you are considering at your South Carolina address.
- If it is Medigap, find out whether underwriting applies and apply before you cancel.
- Confirm the effective date in writing.
How Honorbrook helps South Carolina residents
We are an independent agency licensed in South Carolina and 10 other states. We compare plans offered at your address across many carriers, check your doctors and drugs, and explain the trade-offs plainly. Our help is free because carriers pay us, and your premium is the same whether you use an agent or enroll yourself. See our South Carolina Medicare page for more about how we work in your state.
Medicare Advantage by county in South Carolina
Medicare plan choices are set county by county. Statewide, about 46.7% of people with Medicare in South Carolina are enrolled in a Medicare Advantage plan (CMS, September 2026). Here are the 10 largest counties by residents age 65 and older:
| County | Residents 65+ | Medicare Advantage share |
|---|---|---|
| Horry County | 107,430 | 45.7% |
| Greenville County | 95,536 | 49.4% |
| Charleston County | 78,368 | 35.9% |
| Richland County | 61,710 | 43.1% |
| Spartanburg County | 58,315 | 54.3% |
| Beaufort County | 58,041 | 32.6% |
| Lexington County | 54,364 | 42.3% |
| York County | 47,392 | 46.5% |
| Anderson County | 39,704 | 53.7% |
| Berkeley County | 38,856 | 44.3% |
Questions about your options? Fill out our short form and a licensed agent will reach out. See every county on our South Carolina county directory or our South Carolina Medicare hub. Sources: U.S. Census Bureau 2023 estimates; CMS Medicare Advantage State/County Penetration.
Changing Medicare plans in other states
We are licensed in 11 states. The enrollment windows are federal and the same everywhere, but plan choices and free local help are state-specific:
- When can I change my Medicare plan in Virginia?
- When can I change my Medicare plan in Maryland?
- When can I change my Medicare plan in North Carolina?
- When can I change my Medicare plan in Georgia?
- When can I change my Medicare plan in Alabama?
- When can I change my Medicare plan in Louisiana?
- When can I change my Medicare plan in Texas?
- When can I change my Medicare plan in Michigan?
- When can I change my Medicare plan in Indiana?
- When can I change my Medicare plan in West Virginia?