PEBA Medicare Supplemental vs. Private Medigap: What SC Retirees Need to Know

A retired state employee from Lexington County called me last spring. She and her husband had both retired from state service - she from DSS, he from the Department of Education. They’d been on PEBA Medicare Supplemental for three years. Their combined monthly premiums, on top of their Medicare Part B premiums, were eating nearly $1,000 a month. She wanted to know if there was another option.

There was. We moved them to private Medigap Plan G policies. Their combined premium dropped by more than $500 a month with no reduction in coverage. Same doctors. Same hospitals. Same prescription plan. They just stopped overpaying for the same protection.

This isn’t a rare story. Most PEBA retirees roll into PEBA Medicare Supplemental automatically because it feels safe. It’s the default. The paperwork arrives, the deduction starts, and nobody questions whether it’s the best deal. But for many SC retirees, it’s not.

What PEBA Medicare Supplemental Actually Is

First, let’s be precise about what we’re talking about. PEBA Medicare Supplemental is not Medicare. It’s not a replacement for Medicare. It’s a supplemental plan that wraps around Original Medicare Parts A and B to cover the gaps - deductibles, copays, and coinsurance that Medicare leaves behind.

When you retire from South Carolina state service and become eligible for Medicare at age 65, PEBA transitions your active employee coverage to PEBA Medicare Supplemental. This happens automatically unless you actively opt out. The plan is administered by BlueCross BlueShield of South Carolina on behalf of PEBA.

PEBA Medicare Supplemental works similarly to a private Medigap plan. Medicare pays first (about 80% of approved charges), and the supplemental plan picks up most or all of the remaining 20%. You can see any doctor or hospital that accepts Medicare - there’s no network restriction.

The key difference is cost. PEBA sets its own premiums for this coverage, and those premiums tend to be higher than what private Medigap carriers charge in South Carolina for equivalent coverage.

Source: South Carolina Public Employee Benefit Authority, Retiree Insurance Benefits Guide, peba.sc.gov.

The Real Premium Comparison

Here’s where the numbers get people’s attention. These are approximate 2026 figures for South Carolina:

PEBA Medicare Supplemental (per person/month):

• Subscriber (retiree): $300-$425/month depending on years of service and employer subsidy
• Spouse: $300-$425/month
• Couple total: $600-$850/month (on top of Medicare Part B premiums)

Note: Some retirees receive an employer subsidy that reduces their PEBA premium. The subsidy amount depends on your years of service and retirement date. Even with the subsidy, PEBA premiums often exceed private market rates.

Private Medigap Plan G in South Carolina (per person/month):

• Age 65-67: $120-$175/month depending on carrier
• Age 68-72: $140-$200/month
• Age 73-77: $160-$240/month
• Couple total (ages 65-70): $240-$400/month

Carriers with consistently competitive Medigap Plan G rates in South Carolina include Mutual of Omaha, BlueCross BlueShield of South Carolina, Humana, Aetna, Cigna, and UnitedHealthcare. Rates vary by zip code, age, and tobacco status.

What Plan G covers: Everything that PEBA Medicare Supplemental covers - Medicare Part A and Part B cost-sharing - except the annual Part B deductible ($257 in 2026). After that $257, you have zero out-of-pocket costs for Medicare-covered services for the rest of the year.

The savings potential for a retired couple: If a couple aged 66 switches from PEBA Medicare Supplemental at $750/month combined to private Medigap Plan G at $300/month combined, that’s a savings of $450/month - $5,400 per year. Over ten years, that’s $54,000, and that’s a conservative estimate because PEBA premiums tend to increase annually as well.

A documented case from StartMedicare.us showed a PEBA retiree couple saving approximately $900 per month by switching to private Medigap. The exact savings depend on your specific PEBA premium (which varies by employer subsidy) and which private carrier you choose.

The 31-Day Election Window

This is the piece that creates the most stress, and the most regret when people miss it.

When you retire from state service and become Medicare-eligible, PEBA gives you 31 days to decide whether to enroll in PEBA Medicare Supplemental. If you do nothing, you’re automatically enrolled. The premiums start.

Here’s the trap: if you enroll in PEBA Medicare Supplemental and later decide you want to switch to private Medigap, you’ll need to go through medical underwriting with the private carrier. That means health questions, possible premium surcharges, and the real possibility of being denied coverage if you have significant health conditions.

During your initial Medicare enrollment window - specifically, your six-month Medigap Open Enrollment Period that starts the month you turn 65 and enroll in Medicare Part B - you have guaranteed-issue rights. No private Medigap carrier in South Carolina can deny you, charge you more based on health, or impose waiting periods during this window.

The timing matters enormously. If you’re a state employee approaching 65, you have two critical overlapping windows:

1. PEBA’s 31-day election period: Decide whether to opt into or out of PEBA Medicare Supplemental
2. Federal Medigap Open Enrollment: Your six-month guaranteed-issue window for private Medigap

If you stay on PEBA and use up your Medigap Open Enrollment Period, switching later means underwriting. If you’re healthy at 68, you’ll probably still get approved. If you’ve had a cancer diagnosis or cardiac event, you may not.

Source: Centers for Medicare & Medicaid Services (CMS), Medicare & You 2026 handbook, medicare.gov. Medigap Open Enrollment rights are federal protections under Section 1882 of the Social Security Act.

When Staying with PEBA Makes Sense

I’m not going to tell you that private Medigap is always the better choice. That would be sloppy advice. Here’s when PEBA Medicare Supplemental may be worth the higher premium:

You receive a substantial employer subsidy. Some long-service retirees receive significant premium subsidies from their former employer through PEBA. If your actual out-of-pocket PEBA premium is $100-$150/month after the subsidy, you may already be at or below private Medigap rates. Check your actual payroll deduction, not the sticker price.

You value PEBA’s prescription drug integration. PEBA Medicare Supplemental can be bundled with PEBA’s prescription drug coverage. If you’re on expensive specialty medications that are well-covered under PEBA’s formulary, switching to a standalone Medicare Part D plan could increase your drug costs enough to offset the premium savings on the medical side.

You have a spouse with complex health needs. If one spouse has a condition that would make private Medigap underwriting difficult or impossible, it may make sense to keep both spouses on PEBA rather than splitting coverage. Though in some cases, keeping one on PEBA and moving the healthy spouse to private Medigap is the smart play.

You want simplicity. PEBA is one enrollment, one card, one customer service number. Some retirees value that, and that’s a legitimate preference.

When Switching Saves Real Money

For the majority of healthy PEBA retirees I work with in the Lowcountry, private Medigap is the better financial decision. Here’s the profile of the retiree who benefits most from switching:

• Generally healthy, no major chronic conditions that would complicate underwriting
• On standard medications that are widely covered by Medicare Part D plans
• Within their Medigap Open Enrollment Period (or healthy enough to pass underwriting)
• Paying full or near-full PEBA premiums (limited employer subsidy)
• Spouse is also a candidate for private Medigap

If that sounds like you or someone you know, the potential savings of $3,000-$10,000 per year deserves a serious look.

What you give up: Essentially nothing in terms of coverage. Medigap Plan G provides the same protection as PEBA Medicare Supplemental for Medicare-covered services. You can still see any doctor who accepts Medicare. You still have nationwide coverage. The only structural difference is that you’ll need a separate Medicare Part D prescription drug plan, which I help select during Annual Enrollment each fall.

What you gain: Lower monthly premiums and the flexibility to shop carriers annually if your current carrier raises rates faster than the competition.

Carriers I Work With for SC Medigap

I’m appointed with the major Medigap carriers serving South Carolina:

• Mutual of Omaha - Consistently competitive rates in the Charleston, Columbia, and Greenville markets. Attained-age rating.
• BlueCross BlueShield of South Carolina - Strong brand recognition, large local presence. Some retirees like staying with BCBS since PEBA uses them.
• Humana - Competitive initial rates, extensive supplemental benefit options.
• Cigna - Solid rates in many SC zip codes, particularly for younger enrollees.
• Aetna - Part of the CVS Health family, often competitive for Plan G.
• UnitedHealthcare (AARP-branded) - Widely recognized, large national network, competitive in many SC markets.

The best carrier for you depends on your zip code, age, tobacco status, and the specific rate structure each carrier uses. South Carolina allows attained-age rating, which means your premiums increase as you get older. Some carriers are more aggressive with annual increases than others - this is one of the things I track closely for my clients.

The Prescription Drug Question

One thing PEBA retirees worry about when considering a switch: “What happens to my prescriptions?”

If you leave PEBA Medicare Supplemental, you’ll need a standalone Medicare Part D prescription drug plan. During Annual Enrollment (October 15 through December 7), you choose a Part D plan based on your specific medications, preferred pharmacy, and budget.

Part D premiums in South Carolina range from approximately $7 to $100 per month depending on the plan. Most of my clients land in the $15-$45 range for plans that cover their medications well.

The key step is running your specific drug list through the Medicare Plan Finder tool at medicare.gov or having me do it for you. This shows you which Part D plans cover your medications, at which tier, at which pharmacy, for what annual cost. No guessing.

For retirees on standard medications - blood pressure, cholesterol, diabetes management, common generics - the Part D premium plus copays typically total far less than the premium savings from leaving PEBA.

For retirees on specialty medications, biologics, or high-cost brand-name drugs, we need to do the math carefully. Sometimes PEBA’s drug coverage is genuinely better. Sometimes a Part D plan with the right formulary still comes out ahead. This is exactly the kind of analysis the Blinco Audit is built for.

The Blinco Audit for PEBA Retirees

Here’s what a review looks like when a PEBA retiree sits down with me:

Uncover - I pull up your current PEBA Medicare Supplemental premium, including any employer subsidy. We look at what you’re actually paying per month and per year. Most retirees know the deduction amount but haven’t calculated the annual total.

Decode - We compare your PEBA coverage to private Medigap Plan G and Plan N side by side. Same coverage categories, same benefit structure, real premium numbers from real carriers in your zip code.

Compare - I run your prescription list through the Part D plan options and calculate total annual cost under both scenarios: staying with PEBA vs. switching to private Medigap + standalone Part D. The comparison includes premiums, deductibles, drug costs, and any other out-of-pocket expenses.

Protect - If switching makes financial sense, we handle the enrollment together. I walk you through opting out of PEBA, enrolling in your chosen Medigap plan, and selecting the right Part D plan. If staying with PEBA makes more sense for your situation, I’ll tell you that too. I don’t earn a commission on PEBA coverage, so I have no incentive to move you if staying put is the smarter call.

Bring your PEBA benefits statement and your current prescription list. The consultation takes about 30 minutes, costs nothing, and gives you a clear answer.

Michelle Blinco Smith is an independent insurance broker and is not affiliated with, endorsed by, or sponsored by PEBA, the South Carolina Public Employee Benefit Authority, or any South Carolina state agency. Plan details reflect publicly available information as of April 2026 and may change.

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About the Author

Michelle Blinco Smith, Licensed Insurance Producer (Health, Life, Accident and Sickness) - South Carolina NPN 20072458 - 6 years experience. Based in Summerville, SC, serving retirees, state employees, and families across the Lowcountry and South Carolina. Call or text (843) 594-1759.

I don’t stop until you’re covered.