Chaperone Health Insurance Plus
COBRA and Medicare at 65: Why Your Part B Timing Matters
Reviewed October 2026
When you leave a job around age 65, COBRA can feel like the safe choice. You keep the same doctors, the same insurance card, and the same plan you already know. The catch is that Medicare doesn’t treat COBRA the same way it treats coverage from a job you still have, and that difference can cost you a gap in coverage and a Part B penalty that stays with you. I’m Roxroy Ashley, an independent licensed agent with HealthMarkets, based in Fort Lauderdale, and helping people time COBRA and Medicare is one of the most common conversations I have with clients turning 65 or retiring.
This guide explains how COBRA and Medicare fit together: why COBRA doesn’t extend your Part B enrollment window, how the late enrollment penalty works, what happens when you have one before the other, who pays first, and what it all means for your spouse and your drug coverage. When you’re ready to look at your own dates, book a free plan review and I’ll get back to you personally within 24 to 48 hours.
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Get a Free Quote From an Independent Broker Who Maps Your Medicare Part B Special Enrollment Period
The most expensive COBRA mistakes come down to dates, so before I compare any plans, I check:
- Your timeline: the month you turn 65, your last day of work, and when your Medicare Part B special enrollment period closes
- Your doctors and hospitals against each plan’s network, including HCA Florida, Memorial, and Baptist Health
- Your full-year cost, not only the premium
If anything is unclear, I call your doctor’s office to confirm it. Your quote is free, with no obligation to enroll. Get your free quote and I’ll do the research for you.
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Why Choose Me to Sort Out COBRA and Medicare
When you’re leaving a job and weighing COBRA against Medicare, here’s what to look for in an agent, and what you can expect from me.
Your Timeline, in Writing: I lay out your 65th birthday, your last day of work, the end of your employer coverage, and your Part B deadline on one page, so you know exactly when to act.
Your Doctors, Hospitals, and Prescriptions Checked First: Before I recommend any plan, I check your doctors, hospitals, and every prescription against its network and drug list, including your pharmacy. If something is unclear, I’ll call your doctor’s office myself.
Every Question Answered, at Your Pace: COBRA and Medicare rules interact in ways that aren’t obvious, and most people spend less than an hour on the decision. I take as long as you need, explain each piece in plain language, and answer every question until it makes sense. There’s no pressure and no obligation to enroll.
The Plan That Costs Less for You: The lowest premium isn’t always the lowest cost. I calculate your full-year cost for every plan, including copays, drug costs, and your out-of-pocket maximum, based on your health needs, before you choose.
My Help Costs You Nothing Extra: Insurers pay my commission, and plan premiums are generally the same whether you enroll through me or directly, so you get personal guidance and ongoing support at no additional charge.
Both Paths, Side by Side: Medicare Advantage, Medigap, and Part D each work differently, and your COBRA plan may cover a spouse or dental care that Medicare won’t. I lay out every path that fits your household and explain what you’d gain and give up with each.
I Handle the Paperwork, Including Your Spouse’s: I help you complete the Part B application and the employer form, and I follow up until your enrollment is confirmed. I also help with ACA Marketplace plans, so I can plan your younger spouse’s coverage at the same time.
Education, Not Legal Advice: I can explain how COBRA and Medicare work together, but I can’t give legal advice about your COBRA election or your rights under your employer’s plan. For those questions, talk with your plan’s benefits administrator, the U.S. Department of Labor, or an attorney.
Licensed and Verified: I’m licensed in 33 states, I complete AHIP’s annual Medicare certification, and I’m certified for the 2027 plan year. You can verify my license (Florida License #W323530, NPN #17946070) anytime through your state’s insurance department.
I Stay Your Agent After You Enroll: Work with me directly, in person, by phone, on Zoom, or at your home in Broward, Miami-Dade, or Palm Beach, and I reply within 24 to 48 hours. I review your coverage every Annual Enrollment Period and help with claims and billing in between.
You can read all 25 reasons we should work together on my Why Choose Me page.
Why COBRA Isn’t Coverage Based on Current Employment
Medicare lets you delay Part B without a penalty if you have group health coverage based on current employment, meaning you (or your spouse) are still working for the employer that provides the plan. Once the job ends, the coverage that follows isn’t based on current employment anymore, even if it’s the exact same plan. Medicare’s official enrollment booklet says it directly: COBRA and retiree health plans aren’t considered coverage based on current employment.
That has two practical effects. First, electing COBRA doesn’t pause, restart, or extend your Part B enrollment clock. The clock starts when your job or your active employer coverage ends, not when COBRA ends. Second, months you spend on COBRA without Part B can count toward the Part B late enrollment penalty once you’re past your Initial Enrollment Period. So when people ask me about the COBRA Medicare rules, the short version is this: COBRA can continue your old plan for a while, but it doesn’t protect your Medicare timing.
COBRA is a federal law that generally applies to employers with 20 or more employees. If you worked for a smaller Florida employer, a state law may give you a similar option, often called “mini-COBRA,” and it follows the same idea: it doesn’t count as coverage from current employment for Part B.
How the 8-Month Medicare Part B Special Enrollment Period Works
If you kept working past 65 and had coverage through your job (or your spouse’s job), you generally get an 8-month Special Enrollment Period to sign up for Part B. It begins the month after your employment ends or your employer coverage ends, whichever happens first. Because COBRA doesn’t count as employer coverage based on current employment, the 8 months run while you’re on COBRA, not after it.
Here’s how I walk clients through it:
Confirm your two dates: Find your last day of work and the last day of your active employer coverage. The earlier one starts the clock, and the 8 months begin the following month.
Get the employer section completed: When you sign up for Part B with a Special Enrollment Period, Social Security asks for proof of your employer coverage, usually on form CMS-L564. My guide to the CMS-L564 and CMS-40B forms walks through both forms step by step.
Pick your start date: If you sign up while you still have the employer coverage, or during the first full month after it ends, you can choose for Part B to start the first day of the month you sign up or the first day of any of the next 3 months. If you sign up later in the 8-month window, Part B generally starts the month after you sign up. Most people I work with aim for Part B to start the day after their employer coverage ends, so there’s no gap.
Don’t wait for COBRA to run out: COBRA usually lasts up to 18 months for a job loss or retirement, which is longer than the 8-month Special Enrollment Period. If you wait until COBRA ends to sign up, your window may already be closed.
If you miss your Special Enrollment Period, the next chance is usually the General Enrollment Period, January 1 to March 31 each year, with coverage starting the month after you sign up. That can leave you with months of limited or no coverage, along with a penalty.
One important exception: if you’re turning 65 and your job has already ended, the Special Enrollment Period doesn’t apply. You sign up during your Initial Enrollment Period, the seven-month window around your 65th birthday month, whether or not you’re on COBRA. My Turning 65 Medicare Checklist covers that window in detail.
The Medicare Part B Late Enrollment Penalty
The Medicare Part B late enrollment penalty adds 10% to your monthly Part B premium for each full 12-month period that you could have had Part B but didn’t sign up. Months when you had group health coverage based on current employment don’t count against you. Months on COBRA, retiree coverage, or no coverage at all can. In most cases, you’ll pay the penalty for as long as you have Part B.
Here’s an example using 2026 figures. The 2026 standard Part B premium set by CMS is $202.90 a month. If you went two full 12-month periods without Part B when you could have had it, your penalty would be 20%, which adds about $40.58 a month in 2026. Because the penalty is a percentage of the standard premium, it rises whenever the premium rises. CMS usually announces the next year’s Part B premium in the fall, and the 2027 figure hadn’t been published when this guide was reviewed.
The penalty only tells part of the story. Signing up late can also mean waiting for the General Enrollment Period, then waiting again for coverage to start, while your COBRA plan may pay only a small part of your bills (more on that below).
Medicare and COBRA: What Happens When One Comes First
The order matters here. Medicare and COBRA interact differently depending on which one you had first, and the U.S. Department of Labor’s COBRA guide spells out the difference.
Medicare first, then COBRA: If you already had Medicare Part A or Part B on or before the date you elected COBRA, your plan generally can’t end your COBRA because of Medicare. You can have both, and Medicare usually pays first.
COBRA first, then Medicare: If you elect COBRA and then become entitled to Medicare Part A or Part B, your plan may end your COBRA coverage. Medicare.gov puts it plainly: if you have COBRA before signing up for Medicare, your COBRA will probably end once you sign up. Keep in mind that many people get Part A automatically at 65 if they already receive Social Security benefits, so this can happen without an application on your part.
Because COBRA ending can affect your spouse, your drug coverage, and your Medigap options, I always read the plan’s COBRA notice with clients before they sign anything. Each plan’s documents explain how it handles Medicare, and your benefits administrator can confirm the details for your plan.
Who Pays First, Part D Creditable Coverage, and Medigap Timing
Who pays first: If you have Medicare because you’re 65 or older, or because of a disability, Medicare pays first and COBRA pays second. If you’re eligible for Part B and don’t sign up, your COBRA plan may only pay a small portion of your medical bills, because it may pay as if Medicare had already paid its share. That’s one of the biggest reasons not to skip Part B while on COBRA. The exception is End-Stage Renal Disease (ESRD): if you qualify for Medicare because of ESRD, COBRA pays first during a coordination period of up to 30 months.
Part D and creditable coverage: Drug coverage follows a different rule. COBRA drug coverage can count as creditable coverage if it’s expected to pay, on average, at least as much as standard Medicare drug coverage. Your plan should tell you in writing whether it is, so keep that notice. If your COBRA drug coverage is creditable, Medicare.gov says you’ll have a Special Enrollment Period to join a Medicare drug plan without a penalty when COBRA ends. If it isn’t creditable, or if you go 63 days or more in a row without Part D or other creditable drug coverage after your Initial Enrollment Period, a Part D late enrollment penalty may apply. My Medicare Part D page explains that penalty and how drug plans work.
Medigap timing: Your six-month Medigap Open Enrollment Period starts the first month you have Part B and are 65 or older, and it only happens once. When you sign up for Part B to protect your timing, that Medigap window starts too, even if you’re still on COBRA. Medicare’s Medigap guide also describes a guaranteed issue right if you have Original Medicare and COBRA coverage that pays after Medicare and that coverage is ending, with certain Medigap plans available within 63 days. I’ll help you line up your Part B, Medigap or Medicare Advantage, and Part D start dates so they work together.
COBRA for a Spouse or Dependents Under 65
Medicare covers individuals, not families. If you move to Medicare and your spouse or children are younger than 65, they’ll need their own coverage. The good news is that a spouse or dependent child under 65 can generally keep COBRA after you go on Medicare, and in some situations they may be eligible for up to 36 months of COBRA in total. Your plan’s COBRA notice spells out how long their coverage can last.
COBRA isn’t the only option for a younger spouse. They may also be able to get a plan through the ACA Marketplace. Losing job-based coverage, or having COBRA run out, opens a 60-day Special Enrollment Period for a Marketplace plan. Choosing to stop paying COBRA on your own generally doesn’t, so outside the Marketplace’s annual Open Enrollment Period, the timing of that decision matters. Depending on household income, your spouse may qualify for help paying Marketplace premiums. Since I’m registered with the federal Marketplace, I can compare COBRA and Marketplace options for your spouse at the same time I’m working on your Medicare. Learn more on my Individual and Family Health page.
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Frequently Asked Questions About COBRA and Medicare
Can I Have Medicare and COBRA at the Same Time?
Yes, in many cases. If you already had Medicare Part A or Part B before you elected COBRA, your plan generally can’t end your COBRA because of Medicare, and you can keep both. If you elected COBRA first and then became entitled to Medicare, your plan may end your COBRA. When you have both, Medicare usually pays first and COBRA pays second.
Is There a COBRA and Medicare Part B Penalty?
COBRA itself doesn’t charge a Medicare penalty, but relying on COBRA can lead to one. Because COBRA isn’t coverage based on current employment, months on COBRA without Part B can count toward the Part B late enrollment penalty, which is 10% for each full 12-month period you could have had Part B but didn’t. To avoid it, sign up for Part B within your Initial Enrollment Period or within 8 months after your job or employer coverage ends, whichever comes first.
What Are the Main COBRA Medicare Rules to Know?
There are four I review with every client. COBRA doesn’t extend your Part B Special Enrollment Period. Medicare usually pays first when you have both, except during the ESRD coordination period. Getting Medicare after you elect COBRA may end your COBRA, while having Medicare first generally doesn’t. And Part D follows its own creditable coverage rule, so check whether your COBRA drug coverage is creditable.
Should I Drop COBRA When I Go on Medicare?
It depends on what your COBRA plan covers and who else is on it. Some people keep COBRA for a while because it covers a spouse, dental, or vision, while others drop it once their Medicare coverage starts. Before you decide, check whether ending COBRA affects a spouse or dependents, your drug coverage, or a Medigap guaranteed issue right. I’ll walk through each piece with you, but I can’t give legal advice about your COBRA election.
Does Retiree Coverage Work the Same Way as COBRA?
Yes, for Part B timing. Medicare doesn’t consider retiree health coverage to be coverage based on current employment either, so it doesn’t let you delay Part B without a penalty. Retiree plans also usually pay after Medicare. Your plan’s documents will explain how it works with Medicare.
What if I Already Missed My Part B Special Enrollment Period?
You can usually sign up during the General Enrollment Period, January 1 to March 31, with coverage starting the month after you sign up. A late enrollment penalty may apply. In some limited situations, Medicare offers other Special Enrollment Periods, so it’s worth asking. I can help you look at your options and plan the rest of your coverage around your new start date.
Where Can I Get More Help With COBRA and Medicare?
For Medicare questions, contact Medicare.gov or 1-800-MEDICARE (TTY users should call 1-877-486-2048), 24 hours a day, 7 days a week. In Florida, you can also get free, unbiased Medicare counseling through the state’s SHIP program, called SHINE, which Medicare recommends talking with before you take COBRA. For questions about your COBRA rights, contact your plan’s benefits administrator or the U.S. Department of Labor’s Employee Benefits Security Administration.
Book a Free Plan Review
Leaving a job and weighing COBRA? Pick a time for a free 15-minute call by phone or video. Bring your COBRA notice and your last day of employer coverage, and I’ll help you map your Part B timing. My help never costs you anything extra.
Call or text: (954) 410-3710
Email: contact@chaperonehealthinsuranceplus.com
Office: 6360 NW 5th Way Ste 101, Fort Lauderdale, FL 33309
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