Still Working at 65? How Employer Coverage Affects When and How You Enroll in Medicare

Ohio

 Residents:

This guide answers the most common questions people as when choosing a Medicare Advantage plan. Below, you'll find every topic covered, with links to simple, plain-English, answers for each.

Last Updated:
May 9, 2026
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Turning 65 is a big milestone, but if you're still working, it can feel like a confusing time when it comes to health insurance. Many people wonder whether they should enroll in Medicare right away or wait until they retire. This article will help clarify what happens to your healthcare coverage as you transition into Medicare while still employed.

Do You Need Medicare While Working?

You might be wondering if you need Medicare if you’re already covered by an employer plan. The answer depends on a few factors, but it’s important to know that Medicare is optional for most people who have group health insurance through their current job or a spouse's job, as long as they're still working and the company has 20 or more employees.

Group Health Insurance and Medicare

If you’re under a group health plan at work and your employer has 20 or more workers, this coverage is considered creditable. This means it’s expected to be as good as or better than Original Medicare (Part A and Part B). In this case, you can wait to enroll in Medicare Part B without penalty when you retire.

However, if your employer's plan isn't creditable, meaning it provides less coverage than Medicare, then you should consider signing up for Part B right away. Missing the initial enrollment period could mean paying higher premiums later on.

What If You’re Self-Employed or Work for a Smaller Company?

If you work for a company with fewer than 20 employees or are self-employed and have group health insurance, Medicare rules change slightly. In these cases, you may need to sign up for Part B during your Initial Enrollment Period (IEP), which starts three months before the month of your 65th birthday and ends three months after it.

If you decide not to enroll in Part B when you’re first eligible because you have other coverage, but later lose that coverage, then you can use a Special Enrollment Period (SEP) to sign up for Medicare without penalty. However, if more than eight months pass between the time your group health insurance ends and when you apply for Medicare, you might face higher premiums.

How Does COBRA Fit In?

COBRA stands for Consolidated Omnibus Budget Reconciliation Act. This law allows individuals who leave a job to keep their employer-sponsored healthcare plan for up to 18 months after leaving the company. If you’re considering using COBRA coverage, it’s important to know how that affects your Medicare enrollment.

If you have COBRA and want to avoid paying premiums for both COBRA and Medicare Part B at the same time, it's best to delay enrolling in Medicare until the end of your COBRA period. This way, you can switch directly from COBRA to Medicare without any gaps in coverage or penalties.

What Happens When You Retire?

When you retire, your healthcare needs and options change. If you had creditable employer coverage while working for a company with 20+ employees, and then retire, the rules allow you to delay enrolling in Part B until after retirement without penalty.

Special Enrollment Period After Retirement

After retiring, you have eight months from when your group health insurance ends (either through COBRA or directly) to sign up for Medicare. This period is called a Special Enrollment Period (SEP). During this time, you can enroll in Parts A and B without paying higher premiums due to late enrollment.

Moving From Employer Coverage to Medicare

When moving from an employer plan to Medicare, it’s important to understand how your benefits will change. If you have both Part A (usually free) and Part B when you retire, you may choose a Medigap policy or enroll in a Medicare Advantage plan to cover gaps left by Original Medicare.

Medicare Advantage plans can offer additional benefits like prescription drug coverage, vision, and dental care all rolled into one plan. Alternatively, if you stick with Original Medicare, you can buy a standalone Part D (prescription drug) plan to help manage costs for medications.

Conclusion

Navigating the transition from employer coverage to Medicare while still working can feel complicated, but understanding these key points can make it easier. Remember, your specific situation will depend on whether you have creditable group health insurance and how many employees are in your workplace. If you need more personalized advice or have questions about your unique circumstances, consider speaking with a local Social Security office representative or a licensed Medicare agent.

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Questions Covered in This Guide

How This Applies to 

Ohio

 Residents

Medicare Part B covers most outpatient cardiology services including EKGs, echocardiograms, and specialist consultations. Medicare Advantage plans cover the same services but with different copay structures.

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