Still Working at 65? How Medicare Works with Employer Insurance

Do You Need to Enroll in Medicare If You’re Still Working?

The short answer is: it depends on the size of your employer and whether your coverage is through your job or your spouse’s job.

If Your Employer Has 20 or More Employees:

• Your employer coverage is primary.
• Medicare is secondary.
• You can delay Medicare Part B without penalty.
• Many people still enroll in Part A because it’s usually premium-free (as long as you worked at least 10 years).

If Your Employer Has Fewer Than 20 Employees:

• Medicare becomes primary.
• Your employer coverage becomes secondary.
• You must enroll in Medicare Part A and Part B when you turn 65 to avoid coverage gaps and lifetime penalties.

This rule applies whether the coverage is from your own employer or your spouse’s.

Should You Enroll in Medicare Part A?

Even if you delay Part B, many people choose to enroll in Part A at age 65, since it usually doesn’t cost anything. It can serve as secondary coverage for hospital-related expenses.

But there’s one critical exception: If you’re contributing to a Health Savings Account (HSA), enrolling in Part A (or Part B) will disqualify you from making further HSA contributions.

So, if you plan to keep contributing to your HSA while working, do not enroll in Medicare A or B. Wait until you stop contributing and are ready to fully transition to Medicare.

Comparing Medicare to Employer Coverage: Which Is Better?

Just because you can stay on your employer plan doesn’t mean it’s always the smartest move financially or coverage-wise.

Here are the key things to compare:

Monthly Costs

• What are your premiums, deductibles, and out-of-pocket maximums under your employer plan?
• How do they compare to Medicare Part B plus a Supplement (Medigap) or Medicare Advantage plan?
• If your income is high, factor in IRMAA (Income-Related Monthly Adjustment Amount), which could increase your Part B and Part D premiums.

Coverage and Networks

• Does your employer plan have high deductibles or limited provider networks?
• Medicare Supplement plans offer nationwide access to any provider that accepts Medicare.
• Medicare Advantage plans may have networks, but many include extra benefits like dental, vision, and gym memberships.

Drug Coverage

• Does your employer coverage include good prescription benefits?
• How does it compare to a Part D drug plan?
• Some expensive medications are better covered through employer plans—others may be better through Medicare.

What Happens If You Delay Medicare?

If you delay enrolling in Medicare because you have employer coverage, you won’t be penalized—as long as you enroll during a Special Enrollment Period (SEP).

The SEP lasts for 8 months after you stop working or lose employer coverage (whichever comes first). During this time, you can enroll in Medicare Part A and B without late penalties.

However, if you wait longer than 8 months, you could face lifetime penalties on your Part B premium and may need to wait until the General Enrollment Period (January to March) to sign up.

Planning to Retire Soon? Here’s Your Medicare Checklist

If you’re planning to retire in the next few months, here’s what you should do:

1. Apply for Medicare Part A and B 2 to 3 months before retirement.
2. Obtain proof of credible coverage from your employer (you’ll need this for your SEP).
3. Start comparing Medicare Supplement and Medicare Advantage plans early, so you’re ready to enroll when your employer coverage ends.

Real-World Examples

Let me share a few recent client scenarios:

Client A – Working at 68 with Large Employer Plan

She had excellent coverage through her employer and wanted to keep contributing to her HSA. We advised her to delay Part A and B. When she retires, she’ll have her 8-month SEP to sign up for Medicare with no penalties.

Client B – Self-employed, Small Business (Under 20 Employees)

At 65, he was required to enroll in Part A and Part B, since Medicare was his primary insurance. We helped him compare Supplement and Advantage options to find the most cost-effective coverage.

Summary: What You Need to Know

Situation	Action
Employer has 20+ employees	Can delay Part B (and Part A if contributing to an HSA)
Employer has fewer than 20 employees	Must enroll in A and B at 65 to avoid penalties
Contributing to an HSA	Do not enroll in Part A or B
Losing employer coverage	Enroll in Medicare within 8 months to avoid penalties
Retiring soon	Apply 2–3 months before retirement and compare plans early

Need Help with Your Medicare Decision?

If you’re still working and unsure about when to enroll in Medicare—or whether Medicare is a better deal than your employer plan—we can help.

Call us today at 800-208-4974 to book your free Medicare consultation. We’ll help you evaluate your coverage options, compare costs, and make sure you don’t end up with penalties or coverage gaps.

There’s no charge for our service, and we’re happy to walk you through everything step-by-step.