Medicare Advantage vs. Medigap in South Carolina: 2026 Comparison

When Medicare Advantage Wins

Medicare Advantage plans are the most popular choice for new Medicare beneficiaries in South Carolina, and there are good reasons for that. For certain people, they offer a combination of low cost and convenience that Medigap simply cannot match.

You are relatively healthy

If you go to the doctor a few times a year for routine care, take one or two medications, and do not have a complex chronic condition, Medicare Advantage plans give you excellent coverage at a very low monthly premium. Many plans in Charleston and Dorchester counties have $0 premiums - you pay nothing beyond your standard Part B premium. When your healthcare usage is light, the low premium is the dominant factor in your total annual cost. You are paying less per month and using relatively few services, so the copays and coinsurance you encounter stay minimal. For healthy 65-year-olds just entering Medicare, this can mean saving $2,000 to $3,000 per year compared to a Medigap plan.

You want bundled benefits

Medicare Advantage plans typically include prescription drug coverage, dental, vision, hearing, and sometimes fitness memberships like SilverSneakers - all in one plan with one premium and one card. With Medigap, you need separate plans for drugs (Part D), dental, and vision. That means three or four different policies, three or four different premium payments, and three or four different sets of rules to keep track of. If simplicity matters to you, the all-in-one approach of Medicare Advantage has real appeal. You call one number when you have a question. You carry one card to every appointment.

You are budget-conscious and want predictability on the low end

Medicare Advantage plans have a built-in annual out-of-pocket maximum that caps your total spending for the year. In 2026, that cap can be no higher than $8,850 for in-network services. Many plans in South Carolina set their caps lower, in the $3,900 to $6,700 range. While Medigap covers a higher percentage of costs, Original Medicare with Medigap has no out-of-pocket maximum on its own. For someone on a fixed income who needs to know their absolute worst-case scenario, the hard dollar cap on Medicare Advantage provides a safety net.

The Math: A Real Example for Moderate Healthcare Usage

Let's walk through a realistic scenario. This is based on actual costs I see for clients in the Charleston and Dorchester county area who have moderate healthcare needs.

Enrollment Timing: When You Can Sign Up and When You Cannot

Timing is everything in Medicare. The enrollment rules for Medicare Advantage and Medigap are different, and missing a window can cost you thousands of dollars or lock you out of coverage options entirely.

Initial Enrollment Period (IEP)

Your IEP is the seven-month window surrounding your 65th birthday - three months before, your birthday month, and three months after. During this period, you can enroll in Medicare Part A and Part B, choose a Medicare Advantage plan, or select Original Medicare with a Medigap supplement and a Part D drug plan. This is the most important enrollment window you will ever have, because it is the only time you are guaranteed the ability to buy any Medigap plan in South Carolina without medical underwriting.

Medigap Open Enrollment Period

Your Medigap Open Enrollment starts the first month you are both 65 or older and enrolled in Medicare Part B. It lasts exactly six months. During this window, you have a federally guaranteed right to buy any Medigap plan sold in South Carolina at the standard rate, regardless of your health. No insurance company can turn you down or charge you more. Once this six-month window closes, South Carolina does not provide any additional state-level protections. Insurers can deny you or charge higher rates based on your medical history. This is why I strongly recommend making your Medigap decision during this window, even if you ultimately choose Medicare Advantage instead.

Medicare Advantage Annual Election Period (AEP) and Open Enrollment Period (OEP)

The Annual Election Period runs from October 15 through December 7 every year. During AEP, you can switch between Medicare Advantage plans, switch from Original Medicare to Medicare Advantage, or drop Medicare Advantage and go back to Original Medicare. Changes take effect January 1. There is also a Medicare Advantage Open Enrollment Period from January 1 through March 31 each year, during which you can switch from one Medicare Advantage plan to another or drop Medicare Advantage and return to Original Medicare with a Part D plan. However, if you drop Medicare Advantage during OEP, there is no guarantee you can get a Medigap plan without medical underwriting.

Guaranteed Issue Rights

Certain situations give you a guaranteed right to buy a Medigap plan without medical underwriting outside of your initial open enrollment. These include your Medicare Advantage plan leaving your area or going out of business, losing employer group coverage, or having tried Medicare Advantage for the first time and wanting to switch back within 12 months. If any of these apply to you, the timeline is tight - usually 63 days from the triggering event. Call me immediately if you think you might have a guaranteed issue right, because missing the deadline means losing the protection.