Still Working at 65? Do You Need to Enroll in Medicare?
By Halbert Insurance | Medicare Education
Turning 65 doesn't necessarily mean you're ready to retire. Many Americans continue working well beyond age 65 and maintain health insurance through their employers.
But here's a question we hear frequently at Halbert Insurance:
"If I'm still working and have health insurance through my employer, do I really need to enroll in Medicare?"
The answer depends on several factors, including the size of your employer, the type of health insurance you have, and whether you contribute to a Health Savings Account (HSA).
Understanding these rules can help you avoid unexpected medical bills, coverage gaps, and potential Medicare late-enrollment penalties.
The 20-Employee Rule: Why Employer Size Matters
One of the most important factors in determining whether you should enroll in Medicare at age 65 is the size of your employer.
Employers With 20 or More Employees
If you or your spouse are actively working for an employer with 20 or more employees and you have qualifying group health coverage based on that current employment, the employer's insurance generally pays first.
In this situation, you can often delay enrolling in Medicare Part B without facing a late-enrollment penalty.
Many people choose to enroll in premium-free Medicare Part A while delaying Part B, although this may not be appropriate if they're contributing to an HSA.
It's important to confirm that your coverage qualifies under Medicare's rules before postponing enrollment.
Employers With Fewer Than 20 Employees
If your employer has fewer than 20 employees, the situation is often very different.
For most employees age 65 and older, Medicare becomes the primary payer, meaning Medicare generally pays before the employer's group health insurance.
If you don't enroll in Medicare Parts A and B when required, your employer insurance may not cover expenses that Medicare would ordinarily have paid.
This could leave you responsible for substantial medical bills.
Important: Even if your employer allows you to remain on its health plan, that doesn't automatically mean you can safely delay Medicare enrollment.
Some multi-employer plans and other arrangements have different coordination rules, so it's essential to verify how your particular coverage works.
Can You Delay Medicare Part B Without a Penalty?
Yes, in many situations.
If you have qualifying group health insurance through your own or your spouse's current employment, you may qualify for a Medicare Part B Special Enrollment Period.
Generally, you can enroll in Part B while you're still covered through that current employment or during the eight-month period beginning after the employment or qualifying coverage ends, whichever happens first.
This Special Enrollment Period can allow you to enroll without a Part B late-enrollment penalty.
However, COBRA coverage and retiree health insurance generally do not extend this eight-month enrollment window.
If you're retiring, it's important to plan your Medicare enrollment before your employer coverage ends.
What About Medicare Part A?
Medicare Part A generally covers inpatient hospital services, skilled nursing facility care under qualifying conditions, hospice, and certain home health services.
For most people, Part A is premium-free because they or their spouse paid Medicare taxes while working.
However, enrolling in Part A isn't always the best decision if you're still employed.
One reason involves Health Savings Accounts.
Important: Medicare and Health Savings Accounts
If you're contributing to an HSA, enrolling in any part of Medicare can affect your eligibility to make additional HSA contributions.
Once you're enrolled in Medicare Part A or Part B, you generally can no longer contribute to an HSA.
There's another important detail: if you enroll in premium-free Part A after age 65, your Part A coverage can begin retroactively for up to six months, but not before your first month of Medicare eligibility.
This can create unexpected tax consequences if you continued contributing to your HSA during those months.
For individuals who want to maximize HSA contributions while working, delaying both Medicare Part A and Part B may be worth considering if they qualify to do so.
Before making that decision, speak with your benefits administrator and a qualified tax professional.
What If Your Spouse or Children Are on Your Employer Health Plan?
This is another common concern.
You may have a spouse or dependent children covered under your employer-sponsored health insurance.
Enrolling in Medicare doesn't automatically mean your family members lose their employer coverage.
However, whether you can remain enrolled in your employer's plan, and whether your dependents can continue their coverage, depends on the employer's plan rules.
For example, you might decide to enroll in Medicare while your spouse or children remain on the employer's group plan, if the plan permits that arrangement.
Before making changes, ask your employer's benefits administrator how Medicare enrollment affects your dependents and premiums.
What Happens When You Retire?
When you retire and lose qualifying employer health coverage, Medicare enrollment becomes especially important.
If you previously delayed Medicare Part B because of qualifying active-employment group coverage, you may be eligible for a Special Enrollment Period.
You'll also want to consider how you'll receive your Medicare benefits.
Your main options generally include:
Original Medicare with Medicare Supplement Insurance
This option allows you to use Original Medicare and potentially purchase a Medicare Supplement policy to help pay certain out-of-pocket expenses.
You may also need a separate Medicare Part D prescription drug plan.
Medicare Advantage
Medicare Advantage plans are offered by private insurance companies approved by Medicare. They provide Medicare Part A and Part B benefits and often include prescription drug coverage and additional benefits.
The right choice depends on your doctors, prescriptions, healthcare needs, budget, and personal preferences.
Five Questions to Ask Your Employer Before Turning 65
If you're approaching Medicare eligibility and plan to continue working, ask your benefits administrator:
Does our group health plan pay primary or secondary to Medicare once I turn 65?
Does my employer's size or group insurance arrangement affect Medicare coordination?
Can I safely delay Medicare Part B while maintaining this coverage?
Is my prescription drug coverage considered creditable for Medicare Part D?
How will enrolling in Medicare affect my premiums and coverage for my spouse or dependents?
Getting these answers in writing can help you make a more informed decision.
Don't Assume You Can Wait Until Retirement
One of the biggest Medicare mistakes is assuming that having employer health insurance automatically means you can delay Medicare enrollment.
For some people, delaying Medicare is perfectly appropriate.
For others, particularly those working for smaller employers, delaying enrollment can result in unexpected expenses or coverage problems.
The key is understanding how your specific employer coverage coordinates with Medicare.
Get Personalized Medicare Guidance from Halbert Insurance
At Halbert Insurance, we understand that Medicare decisions become more complicated when you're still working.
As an independent Medicare insurance agency based in North Texas, we help individuals in multiple states understand Medicare enrollment, employer coverage coordination, and their options when transitioning into retirement.
Whether you're turning 65 next month or planning to work for several more years, we're here to help you understand your choices.
Still working and approaching age 65?
Schedule a Medicare consultation with Halbert Insurance. We'll help you identify the questions you need answered before making important Medicare enrollment decisions.
Halbert Insurance is an independent insurance agency and is not affiliated with or endorsed by the federal Medicare program. Medicare eligibility and enrollment rules depend on individual circumstances. Information is educational and is not legal or tax advice.
Turning 65 Soon?
If you're approaching your 65th birthday, it's important to understand Medicare enrollment deadlines, coverage options, and potential penalties. Read our Turning 65 in 2027? Your Medicare Enrollment Checklist for a helpful overview of what to expect.
About the Author
Jarrod Halbert is the founder of Halbert Insurance, an independent insurance agency based in The Colony, Texas. He has worked in insurance since 2016 and helps clients across 30 states understand Medicare coverage and enrollment options.
Halbert Insurance is an independent insurance agency and is not affiliated with or endorsed by the federal Medicare program. Plan availability, benefits, eligibility, and enrollment rights vary by individual circumstances and location. This article is provided for educational purposes.
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