When to Enroll in Medicare in South Carolina: A Timeline

Medicare enrollment in South Carolina follows federal rules, and the deadlines are strict. Miss your window, and you face permanent penalties that increase your premiums for the rest of your life. Whether you’re turning 65 in Summerville, retiring from Boeing in North Charleston, or leaving the military at Joint Base Charleston, the timeline below tells you exactly when to act and what happens if you don’t.

Your Initial Enrollment Period (IEP)

Your Initial Enrollment Period is a seven-month window centered on the month you turn 65:

• 3 months before your 65th birthday month
• Your birthday month
• 3 months after your birthday month

If you turn 65 on July 15, your IEP runs April 1 through October 31.

What to enroll in during this window:

• Part A (Hospital Insurance): Most people get Part A premium-free if they or a spouse paid Medicare taxes for 40+ quarters. Enroll during IEP. There’s rarely a reason to delay Part A.
• Part B (Medical Insurance): Covers doctor visits, outpatient care, preventive services. Monthly premium is $185/month in 2026 for most people (higher if income exceeds $106,000 individual / $212,000 married).
• Part D (Prescription Drug Coverage): Choose a standalone Part D plan if you’re staying on Original Medicare, or enroll in a Medicare Advantage plan that includes drug coverage.
• Medigap (Medicare Supplement): Your Medigap Open Enrollment Period starts the first month you have both Part A and Part B at age 65 or older. This is your guaranteed-issue window. no health questions, no denials.

When your coverage starts depends on when you sign up:

• Sign up in the 3 months before your birthday month: coverage starts the 1st of your birthday month
• Sign up during your birthday month: coverage starts the 1st of the following month
• Sign up in the 3 months after: coverage starts 1-3 months later

Bottom line: sign up in the first three months of your IEP. Don’t wait.

The Working-Past-65 Exception (Special Enrollment Period)

If you’re still working at 65 and covered by an employer group health plan (based on current employment, with 20+ employees), you can delay Medicare Part B without penalty.

This is common in the Lowcountry. I work with people at Boeing, MUSC, Trident Health, Blackbaud, and Benefitfocus who are still working well past 65. Here’s how it works:

• Keep your employer coverage as primary
• Enroll in Part A (it’s free and doesn’t conflict with most employer plans; check with HR if you have an HSA)
• Delay Part B until you retire or lose employer coverage

When you retire or lose that employer coverage, you get a Special Enrollment Period (SEP): eight months to sign up for Part B without a late penalty. Coverage starts the month after you enroll.

Critical warning: COBRA, retiree coverage, VA benefits, and insurance from a spouse’s former employer do NOT count as current employer coverage. If your employer has fewer than 20 employees, Medicare is likely primary, and you may need Part B immediately.

I’ve seen this mistake too many times. Someone retires from a small Summerville business, goes on COBRA thinking they’re covered, and skips Part B. Eighteen months later, they’re facing a permanent penalty.

General Enrollment Period (GEP)

If you missed your IEP and don’t qualify for a Special Enrollment Period:

• When: January 1 through March 31 each year
• Coverage starts: July 1 of that year
• Penalty: 10% added to your Part B premium for each full 12-month period you could have had Part B but didn’t

That gap between enrolling (March at the latest) and coverage starting (July) is three months with no Medicare coverage. And the penalty is permanent.

Example: You were eligible for Part B at 65 but waited two years. Your Part B premium increases by 20% for life. At $185/month, that’s an extra $37/month. $444/year. every year until you die.

Medicare Advantage and Part D Enrollment Windows

Annual Enrollment Period (AEP): October 15 - December 7

• Switch from Original Medicare to Medicare Advantage (or vice versa)
• Change Medicare Advantage plans
• Join, switch, or drop Part D plans
• Changes take effect January 1

Medicare Advantage Open Enrollment Period (MA OEP): January 1 - March 31

• Only for people currently enrolled in a Medicare Advantage plan
• Switch to a different Medicare Advantage plan, or
• Drop Medicare Advantage and return to Original Medicare (and enroll in a standalone Part D plan)
• Changes take effect the 1st of the month after the plan receives your request

Part D Late Enrollment Penalty: 1% of the national base beneficiary premium for each month you went without creditable drug coverage. This adds up fast and never goes away.

Medigap Open Enrollment (The Window You Can’t Afford to Miss)

Your Medigap Open Enrollment Period is six months, starting the first month you have Part B at age 65 or older. During this window:

• Every Medigap carrier in South Carolina must sell you any plan they offer
• They cannot charge you more because of health conditions
• They cannot deny you coverage
• They cannot impose waiting periods for pre-existing conditions

After this window closes, South Carolina does not guarantee your right to buy a Medigap plan. Carriers can underwrite you. meaning they can deny you, charge higher premiums, or exclude coverage for pre-existing conditions.

There are a few exceptions (guaranteed-issue rights when you lose certain coverage), but they are narrow. The six-month window at 65 is the big one. Use it or risk losing it.

The South Carolina Medicare Timeline at a Glance

Age / Event	What to Do	Deadline	Penalty for Missing
Turning 65, not working	Enroll in Parts A, B, D + Medigap	7-month IEP	Permanent premium surcharges
Turning 65, still working (20+ employees)	Enroll in Part A; delay Part B	No deadline while working	None, if employer plan is creditable
Retiring after 65	Enroll in Part B within 8 months	8-month SEP	10%/year Part B penalty
Missed IEP, no SEP	Enroll Jan 1 - Mar 31	GEP deadline	Coverage gap until July 1
Every fall	Review Part D and Advantage plans	Oct 15 - Dec 7	Stuck with current plan for another year

What to Bring to Your Medicare Appointment

When you sit down with me, bring:

• Your Medicare card (if you have one) or Social Security statement
• A list of your current medications (name, dosage, frequency)
• Names of your doctors and which hospitals you prefer (Trident, Roper, MUSC)
• Your most recent tax return (we need income to determine Part B and Part D premiums)
• Any current insurance cards (employer plan, TRICARE, VA)
• Questions. Write them down. There are no dumb ones.

Frequently Asked Questions

What if I’m 65 and still working but my employer has fewer than 20 employees?

Medicare becomes your primary insurance. You should enroll in Part B during your IEP to avoid penalties. Your employer plan becomes secondary.

Do I have to sign up for Medicare if I’m covered by my spouse’s employer plan?

If your spouse’s employer has 20+ employees and you’re covered under their group plan, you can delay Part B. The same rules apply as if it were your own employer.

Can I enroll in Medicare online?

Yes. You can enroll in Parts A and B through Social Security’s website (ssa.gov) or by visiting the Social Security office in North Charleston. For Part D and Medicare Advantage plans, you enroll directly with the insurance carrier or through Medicare.gov.

What if I have TRICARE from Joint Base Charleston?

TRICARE For Life works as secondary coverage after Medicare. You must enroll in Part B to keep TRICARE For Life benefits. Part A enrollment happens automatically at 65.

When should I contact a Medicare agent?

Three months before you turn 65, or three months before you plan to retire. That gives us time to do the Blinco Audit properly. compare plans, check your doctors, run drug cost analysis, and make a decision before any deadline pressure.

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I don’t stop until you’re covered. Medicare deadlines are real, penalties are permanent, and the right time to plan is before the clock starts ticking. I’m in Summerville. let’s get your timeline sorted.