Losing Your Work Coverage? Here's How to Move to Medicare Without a Gap or a Penalty.
The window to enroll without penalty is shorter than most people expect — and the rules around COBRA and employer size catch a lot of people off guard.
The 8-Month Special Enrollment Period — and Why the Clock Starts When You Think
When you're covered by an employer group health plan through your own active employment (or a spouse's), you can delay Medicare Part B without penalty. But once that employment or coverage ends, an 8-month Special Enrollment Period begins — and it starts the month after your group coverage ends, not when COBRA begins.
That distinction matters more than most people realize.
During this 8-month window, you can enroll in Medicare Part A and Part B without facing a late enrollment penalty. Miss it, and you may wait until the next General Enrollment Period — January through March — with coverage that doesn't start until July. That's a potential gap of months, plus a penalty that follows you for life.
The 8-month SEP applies whether you're retiring, being laid off, or otherwise losing access to employer-sponsored coverage. It does not apply to retiree coverage or COBRA — more on that below.
Working Past 65? The Rules Depend on Your Employer's Size.
If you're still working at 65 and covered through your job, you may have a legitimate reason to delay Medicare Part B — but only if your employer has 20 or more employees.
For employers with 20 or more employees, your group plan is primary and Medicare is secondary. Delaying Part B is generally safe in this situation, and I can walk you through exactly how to document that delay so you're protected when you do enroll.
For employers with fewer than 20 employees, Medicare becomes primary — meaning your employer plan pays as if Medicare is already in place. If you haven't enrolled in Part B, your group plan may cover very little. This is one of the most expensive Medicare mistakes I see, and it's completely avoidable with a 15-minute conversation before your 65th birthday.
If you're still working past 65, the question isn't whether to enroll — it's whether you need to enroll now. I review your employer's size and your current coverage to give you a clear answer.
COBRA Is Not the Same as Active Employer Coverage — This Mistake Has a Lifelong Cost
This is the most common misunderstanding I encounter with clients who are leaving a job.
COBRA is continuation coverage — you're paying to extend the same group plan after employment ends. But for Medicare enrollment purposes, COBRA does not count as active employer coverage. The same is true for most retiree health plans.
That means if you leave your job, elect COBRA, and assume you're covered while you figure out Medicare, your 8-month Special Enrollment Period is already running. If you miss it while on COBRA, you'll face the same late penalties as someone who simply forgot to enroll.
The Part B late enrollment penalty is 10% of the standard premium for every 12-month period you were eligible but didn't enroll. That penalty is permanent — it's added to your Part B premium for as long as you have Medicare.
Getting the timing right before you leave your job is far easier than correcting a penalty after the fact.
How I Help You Make the Transition
Coordinating the move from employer coverage to Medicare involves more than picking a plan. I help clients work through the full transition:
Identify your exact enrollment window based on your last day of coverage
Explain how COBRA or retiree coverage interacts with Medicare so there are no surprises
Compare Medicare Advantage, Medicare Supplement, and Part D options against your doctors and prescriptions
Coordinate enrollment timing so your new Medicare coverage starts the day your employer coverage ends
I work virtually across Missouri, Illinois, and seven other states, so there's no office visit required. Most clients complete the full transition with two or three phone calls.
Common Questions About Losing Employer Coverage and Medicare
When does my Special Enrollment Period start if I'm retiring?
Your 8-month Special Enrollment Period begins the month after your employment ends or your group health coverage ends, whichever comes first. It does not begin when COBRA starts. If you're retiring, the clock starts the month after your last day of active employment coverage — not when you submit your retirement paperwork.
Can I use COBRA to delay enrolling in Medicare?
No. COBRA is continuation coverage, not active employer coverage. For Medicare enrollment purposes, your Special Enrollment Period begins when your employment ends — regardless of whether you elect COBRA. Enrolling in COBRA and waiting on Medicare can result in a late enrollment penalty that's added to your Part B premium permanently.
What is the Medicare Part B late enrollment penalty?
The penalty is 10% of the standard Part B premium for each full 12-month period you were eligible but didn't enroll. It's added to your monthly premium for as long as you have Medicare. For most people, this is entirely avoidable with the right enrollment timing.
I'm still working at 65. Do I have to sign up for Medicare?
It depends on how many employees your employer has. If your employer has 20 or more employees, you can generally delay Part B without penalty while you remain actively employed and covered. If your employer has fewer than 20 employees, Medicare becomes primary and you should enroll in Part B to avoid coverage gaps. I review your specific situation before advising you either way.
What's the difference between Medicare Advantage and Medicare Supplement when I'm leaving employer coverage?
Medicare Advantage (Part C) replaces Original Medicare with a managed care plan — typically lower premiums but with networks and cost-sharing. Medicare Supplement (Medigap) works alongside Original Medicare and covers many of the out-of-pocket costs Medicare doesn't pay. The right choice depends on your health, your doctors, and your budget. I compare both options against your specific situation before making any recommendation.
Let's Make Sure Your Coverage Doesn't Skip a Beat
The transition from employer coverage to Medicare is one of the most time-sensitive decisions you'll make. I help clients get the timing right, understand what COBRA does and doesn't do, and choose a Medicare plan that fits their doctors, prescriptions, and budget — at no cost to them.
My fee comes from the carrier. Your premium is identical whether you enroll through me or on your own. The only difference is that you have someone walking you through it.