If you're turning 65 soon, or you're already on Medicare and wondering if you've got the right coverage, this guide is for you. I'm going to walk you through Medicare Supplement Insurance the way I'd explain it sitting across from you at our Lexington office.

No jargon. No pressure. Just what you need to know to make a smart decision for yourself or someone you love.

What Medicare Supplement Insurance Actually Is

Medicare Supplement Insurance, which most folks call Medigap, is a private insurance policy that pays the costs Original Medicare leaves on your plate. Things like the 20% coinsurance on doctor visits, hospital deductibles, and the gaps that can turn a routine procedure into a four-figure bill.

Original Medicare (Parts A and B) covers a lot, but it doesn't cover everything. There's no out-of-pocket maximum on Original Medicare, which surprises a lot of people. That means if you have a serious health event, your costs can keep climbing with no ceiling.

A Medigap plan puts a ceiling on it. You pay a predictable monthly premium, and the plan picks up most or all of what Original Medicare doesn't.

Here's a fact a lot of seniors don't know: Medigap plans are standardized by the federal government. A Plan G from one carrier covers exactly the same things as a Plan G from another carrier. The only differences are the price and the company behind the policy. So when you're shopping, you're really shopping for price and service, not coverage.

The Medigap Plans That Matter Most in South Carolina

There are ten standardized Medigap plans on paper (labeled A, B, C, D, F, G, K, L, M, and N), but in practice, almost everyone in South Carolina ends up choosing between three of them.

Plan G is the most popular plan we write at Mauldin Insurance Group, and for good reason. It covers nearly everything Original Medicare doesn't. The only thing you pay out of pocket is the Part B deductible, which is $283 in 2026. After that, your covered medical care is paid in full. No copays. No surprise bills. If you want maximum predictability, this is it.

Plan N is the budget-conscious option. It has a lower premium than Plan G, usually by $20 to $40 per month. The trade-off is small copays of up to $20 for office visits and up to $50 for ER trips, and you pay the Part B deductible yourself. Plan N is a solid choice for healthier seniors who don't see the doctor often and want to keep their monthly costs down.

Plan F is the most comprehensive Medigap plan ever offered. It covers everything, including the Part B deductible. The catch: it's only available to people who were eligible for Medicare before January 1, 2020. If that's you, you can still enroll. If you became Medicare-eligible after that date, Plan F is off the table, and Plan G is the closest equivalent.

(Plan C is in the same boat as Plan F, also unavailable to anyone who became Medicare-eligible on or after January 1, 2020. I mention it because some older articles still list it as an option for new enrollees, and that's no longer true.)

Who Qualifies in South Carolina

To enroll in a Medigap plan in South Carolina, you need to be enrolled in both Medicare Part A and Part B. Most folks become eligible at 65. People under 65 with certain disabilities can qualify too, though carrier options for under-65 enrollees are more limited in our state.

You also need to be a South Carolina resident. If you split time between SC and another state (we see this with retirees who keep a place at the lake or near the beach), the address on your Medicare records is what matters.

The Six-Month Window That Most People Miss

This is the single most important thing in this whole guide, so I want to slow down here.

Your Medigap Open Enrollment Period is a one-time, six-month window that starts the first month you are both 65 AND enrolled in Medicare Part B. During those six months, no insurance company in South Carolina can turn you down or charge you more because of your health history. They have to take you, at the standard rate, no questions asked.

After that window closes, the rules change. Carriers can ask health questions. They can decline you. They can charge you more. Some people sail through underwriting with no issue. Others get declined for things they didn't even realize were a problem.

I've sat down with folks who waited a few years to "look into Medigap" because they felt healthy and figured they'd deal with it later. Then a diagnosis came, and suddenly they couldn't get the coverage they wanted. Don't let that be you. If you're approaching 65, get your plan in place during your open enrollment window, even if you have to switch later.

What Medigap Actually Costs in the Midlands

Premiums vary by carrier, age, zip code, and whether you use tobacco. In Lexington, Cayce, West Columbia, Blythewood, and the surrounding Midlands, here's what you can generally expect for a 65-year-old non-smoker in 2026:

• Plan G: roughly $130 to $200 per month
• Plan N: roughly $100 to $160 per month
• Plan F (if eligible): roughly $180 to $260 per month

Older enrollees pay more. A 75-year-old will typically pay 30 to 50 percent more than a 65-year-old for the same plan. That's why locking in coverage early and choosing a carrier with a stable rate history matters more than just picking the cheapest premium today.

Two people the same age, living on the same street, can pay very different amounts for identical coverage just because they picked different companies. I've seen $40-per-month differences between carriers for the exact same Plan G. Over ten years, that's $4,800 left on the table for nothing.

What Medigap Doesn't Cover

I want to be straight with you about the limits.

Medigap does not include prescription drug coverage. You'll need a separate Medicare Part D plan for medications. We help our Medicare clients set both up at the same time, because a good drug plan can save you thousands a year if your medications are expensive.

Medigap also doesn't cover dental, vision, or hearing. Those are handled with standalone plans, and we write those too.

Medigap doesn't cover long-term custodial care, like a nursing home stay for someone who can't perform daily activities on their own. That's a separate conversation about long-term care insurance, hybrid life policies, or asset planning.

Why Working With a Local Agent Is Worth Your Time

Here's the honest truth about Medicare Supplement shopping: the rates are public, the benefits are standardized, and you can do it all yourself if you want to. Some people do.

What an independent local agent gives you is someone who already knows which SC carriers are competitive in your county, which ones raise rates aggressively after a few years of "low introductory" pricing, and which ones answer the phone when you actually need to use your plan.

It costs you nothing extra to work with us. The premium is the same whether you go direct to the carrier or through an agent. The carrier pays our commission, not you.

My wife Jennifer is the licensed Medicare specialist at Mauldin Insurance Group. She's the one who'll walk you through plans, run quotes from multiple carriers, and answer questions for as long as you need. She does this every week with folks across Lexington County, Richland County, and the broader Midlands. No pressure. No rushing. Just real conversations.

We represent multiple Medicare carriers, so we can compare options side by side rather than push you toward one company.

Get a Free Quote

If you're getting close to 65, or already on Medicare and wondering if you're overpaying, reach out. We'll pull rates from the top carriers in your zip code, walk you through the differences, and give you a straight answer about whether what you have is working.

You can call or text Jennifer at (843) 509-2462, or call me at (803) 920-8827. You can also reach us through mauldininsurancegroup.com or southcarolinamedicareagency.com.

We're based in Lexington and serve clients across the Midlands and statewide.

Frequently Asked Questions

What's the most popular Medicare Supplement plan in South Carolina?

Plan G. It offers the most comprehensive coverage available to anyone who became Medicare-eligible on or after January 1, 2020, and it's our most-written plan at Mauldin Insurance Group.

Can I be denied a Medicare Supplement plan in SC?

Not during your six-month Medigap Open Enrollment Period. Outside that window, yes. Carriers can use medical underwriting and decline applicants with certain health conditions or charge them higher rates.

Does Medicare Supplement cover dental, vision, or prescription drugs?

No. You'll need separate plans for each. We can help you set up dental, vision, and Part D drug coverage alongside your Medigap plan.

What's the difference between Medicare Supplement and Medicare Advantage?

Medicare Supplement (Medigap) works alongside Original Medicare to pay the costs Medicare leaves behind. You can see any provider in the country who accepts Medicare. Medicare Advantage replaces Original Medicare with a private plan, usually with a network you have to stay in, but it often includes extras like dental and vision. They're fundamentally different products. Which one fits depends on your priorities, your doctors, and your travel patterns. We walk through that decision with every Medicare client.

Can I switch Medicare Supplement plans later?

Yes, but it depends on when. Outside guaranteed issue situations, you'll go through medical underwriting. If you're healthy, switching to a cheaper carrier is often worth it. If you're not, you may be stuck with what you have. This is one of the most common reasons people call us, and we can tell you in about 10 minutes whether switching makes sense for you.

About the Author

Ben Mauldin is the co-owner of Mauldin Insurance Group in Lexington, SC, an independent agency he runs with his wife Jennifer. He holds South Carolina Resident Producer License #21612911 (Life, Accident & Health, and Property & Casualty). Before insurance, Ben spent years in regional planning at the Central Midlands Council of Governments. He serves on the boards of Our Place of Hope and the Midlands Workforce Development Board, and drives transport for the South Carolina Youth Advocate Program in his spare time.