Most people assume COBRA lets them delay Medicare enrollment without penalty. It doesn’t. This is one of the most expensive Medicare mistakes I see — and it’s almost always made by people who did everything else right.
What Is the COBRA Medicare Mistake?
COBRA is not creditable coverage for Medicare purposes. When you leave employer coverage and elect COBRA, you are not in a Special Enrollment Period. Your Initial Enrollment Period clock keeps running. If you miss it, you face a permanent 10% late enrollment penalty on Part B for every 12 months you delayed — and that penalty follows you for life.
Why Do So Many People Make This Mistake?
Because COBRA feels like real insurance — and it is real insurance. It covers your medical bills. But Medicare doesn’t care whether your bills got paid. Medicare cares whether you had coverage that qualifies as creditable. COBRA doesn’t qualify.
The confusion is understandable. You retire, HR hands you a COBRA packet, it looks official, and nobody mentions that enrolling in COBRA instead of Medicare is a costly error. I’ve helped clients throughout the Kansas City metro area who paid this penalty for 10 and 15 years before they realized what happened.
What Should You Do Instead of COBRA?
In most cases, enroll in Medicare when you first become eligible — during your Initial Enrollment Period. If you need supplemental coverage for things Medicare doesn’t cover, that’s what Medicare Supplement (Medigap) plans are for.
The only situation where delaying Medicare makes sense is if you have active employer coverage from a current employer with 20 or more employees. COBRA is not active employer coverage — it’s coverage you’re paying for after leaving employment.
How Long Is the Medicare Initial Enrollment Period?
Your Initial Enrollment Period is 7 months — 3 months before your 65th birthday month, your birthday month, and 3 months after. Enrolling in the first 3 months ensures your coverage starts on the first day of your birthday month with no gap.
What Happens If You Already Made This Mistake?
If you delayed Medicare enrollment because of COBRA and are now facing the late enrollment penalty, you have limited options. The penalty is permanent and cannot be waived except in very specific circumstances. What you can do is minimize future costs by choosing the right Medicare Supplement or Advantage plan for your situation going forward.
If you’re currently on COBRA in Blue Springs, Independence, or anywhere in the KC metro and haven’t yet missed your enrollment window, call me today. The window closes and there’s no recovering from missing it.
Frequently Asked Questions
Does COBRA count as creditable coverage for Medicare?
No. COBRA does not count as creditable coverage for Medicare Part B enrollment purposes. Electing COBRA after leaving employer coverage does not give you a Special Enrollment Period and does not pause your Initial Enrollment Period.
Can I have both COBRA and Medicare at the same time?
Yes, but Medicare will be primary and COBRA secondary. Once you enroll in Medicare, COBRA becomes largely redundant and you’re paying for coverage you don’t need. In most cases, a Medicare Supplement plan is a better and less expensive option than keeping COBRA alongside Medicare.
How much is the Medicare Part B late enrollment penalty?
The penalty is 10% of the standard Part B premium for every 12-month period you delayed enrollment without qualifying coverage. In 2026, the standard Part B premium is $202.90 per month — so a two-year delay adds approximately $40/month permanently.