5 Most Common Medicare Mistakes Employers Make If you asked a room of HR leaders whether they felt confident about their Medicare coordination, how many hands would go up? A few brave souls, maybe one person who misunderstood the question. Because Medicare compliance is deceptively invisible until it isn't. You don't know there's a problem until a claim processes wrong, or a recovery letter shows up, or an employee calls confused about a bill they weren't expecting. By then, the damage is done and you're playing cleanup on your calendar.
The patterns are remarkably consistent. The same employer Medicare mistakes show up again and again, across industries and company sizes. And they're rarely made by careless people. They're usually made by people who didn't know the rule existed, or who knew the rule but didn't realize it applied to their situation. As any HR team will tell you, "urgent and preventable" is the worst category of problem to be in. It's right up there with "we ran out of coffee the morning of open enrollment."
Here's a candid look at what goes wrong most often, and what separates employers who avoid these mistakes from those who keep meeting them.
Mistake #1: Misunderstanding Which Payer Is Primary An employer thinks they're not subject to Medicare Secondary Payer rules because they're a small company. Or they assume their plan is always primary, no questions asked. Or they're vaguely aware of the rules but figure they don't really apply to their situation. Then claims start routing incorrectly, or an employee ends up with a bill that's much larger than expected.
The trouble is that MSP rules aren't one-size-fits-all. Nineteen employees is a different world than twenty-one. A disabled employee under 65 triggers different rules than someone over 65 who's still actively working. ESRD has its own coordination timeline entirely. Most employers know the basic rule ("if the employee is working, we're primary") but haven't heard about the exceptions. And the exceptions are exactly where compliance breaks.
For Ohio Medicare employers especially, these thresholds matter. Many mid-size Ohio companies sit right around the 20-employee cutoff , which means primary/secondary status can shift with a single hire or termination.
The fix: Know your headcount. Know your MSP classification. Know which employees are Medicare-eligible and why. If you genuinely don't know, ask your TPA or benefits consultant. Don't guess. This is not a good area for guessing.
Mistake #2: Never Communicating Enrollment Windows to Employees An employee approaches 65. No one tells them when to enroll in Medicare. Or HR says something like "sometime around your birthday," helpful as a fortune cookie, without explaining the consequences of missing the window. The employee delays. They miscalculate the date. They enroll late. And now they're carrying a Part B penalty that will follow them for decades.
This is partly a communication failure and partly a documentation failure. There's no standard process, so the notification doesn't happen consistently, or doesn't happen at all. And even when employers try to communicate, the message isn't specific enough to actually land.
From a compliance standpoint, Medicare for employers requires timely, accurate notice about enrollment timelines and the consequences of delaying. If an employee later claims they were misinformed or never informed, a lack of documentation leaves you in a very uncomfortable spot.
The fix: Create a standard written notice about Medicare enrollment timelines and penalties. Send it to employees six months before they become eligible. Don't rely on verbal communication (which a court will not find compelling). Document that you sent it.
Mistake #3: Failing to Document Creditable Coverage An employee retires. They go on COBRA for 18 months. Then they enroll in Medicare. Years later, there's a question about whether they had creditable coverage for Part D purposes, meaning whether they can avoid a late enrollment penalty. But no one ever documented whether your plan actually qualified as creditable. You assumed it did. You just never wrote that down anywhere.
Now you're trying to reconstruct what coverage the employee had, when they had it, and whether it actually met Medicare's standard. This is a terrible use of everyone's afternoon.
Creditable coverage documentation is one of those employer Medicare requirements that most companies overlook entirely. Medicare requires employers to send annual notices to Medicare-eligible employees confirming whether the group plan's drug coverage meets Medicare's creditable coverage threshold. If that notice doesn't go out, employees can't make an informed decision about Part D enrollment. And if they guess wrong and enroll late, the penalties apply , even if the reason they guessed is that you didn't tell them.
The fix: Work with your plan administrator or carrier to make sure creditable coverage notices go out annually, in writing, to all Medicare-eligible employees. Keep copies. File them somewhere you can actually find them.
Mistake #4: Confusing COBRA and Medicare Rules This one causes a lot of headaches. An employee terminates. The employer offers COBRA. The employee is Medicare-eligible, so the employer figures Medicare goes first and COBRA is secondary. Or the employer offers COBRA without mentioning Medicare, so the employee picks COBRA and skips Medicare entirely, thinking they're covered when they're underinsured. Or the employee goes on COBRA, enrolls in Medicare late, and now everyone is having a very long conversation about whether COBRA counted as creditable coverage.
Here's the short version: if you're Medicare-eligible, you should enroll in Medicare and use COBRA as secondary coverage, or skip COBRA and let Medicare be your primary . Using COBRA alone when you're Medicare-eligible is almost always a poor financial decision, because Medicare is primary anyway. COBRA doesn't protect you the way it would if you weren't Medicare-eligible.
Most employers don't explain this. So employees make Medicare decisions on incomplete information, delay enrollment thinking COBRA has them covered, and then get a penalty. A penalty that was entirely preventable.
The fix: When a Medicare-eligible employee terminates, your COBRA notice should explicitly address Medicare, whether it's primary or secondary, and whether the employee needs to enroll. Don't assume they already know. They probably don't.
Mistake #5: Letting Employees Self-Manage Medicare Without Any Education The biggest mistake, and the most common one: treating Medicare as the employee's problem. They're turning 65, so they can figure it out. Your job was to provide health benefits; the Medicare piece is between them and CMS. Right?
Wrong. The moment an employee is Medicare-eligible and covered under your group plan , Medicare compliance is your compliance issue too.
Employees don't know about creditable coverage. They don't know about the conflict between Part A and HSA contributions . They don't know the clock is running on Part B penalties . They don't know which plan is primary. They find out about these things when it's too late, and they call HR frustrated, sometimes rightfully so.
The most cost-effective investment you can make is also the simplest: education. A one-page guide on Medicare enrollment and deadlines. A short webinar for employees approaching 65. A clear statement: here are the rules, here are the consequences, here's how to stay compliant. A few hours to build. Months of cleanup avoided.
Whether you're an Ohio Medicare employer or operating in any other state, the compliance requirements are the same. The difference is whether your team is equipped to meet them before problems show up.
The Good News Most employer Medicare compliance mistakes are reversible if you catch them early. They become expensive and disruptive when you catch them late. The difference between those two outcomes is usually just knowledge, communication, and documentation, all of which are entirely within your control. But you are not alone. This is where Exact Benefits is uniquely equipped to help. We come alongside you, at no cost to you, to help educate your team and, most importantly, your soon-to-be eligible Medicare employees on all their options.
Next issue in the Exact Benefits Newsletter: What Triggers Retroactive Medicare Penalties, and why the clock starts earlier than most people think.
Frequently Asked Questions How can I tell if my company is following Medicare compliance requirements correctly? Medicare compliance can involve employer size rules, Medicare Secondary Payer (MSP) requirements, enrollment timelines, and creditable coverage notices. If you're unsure whether your current processes meet Medicare requirements, Exact Benefits can review your situation, answer your questions, and help your HR team identify potential compliance gaps before they become costly issues.
What should I do if one of my employees is turning 65? Employees approaching age 65 often need guidance on Medicare enrollment, how it works with employer-sponsored health insurance, and whether they should enroll in Medicare Part A or Part B. Exact Benefits provides personalized Medicare education and enrollment support, helping employees understand their options while reducing the administrative burden on your HR team.
Can Exact Benefits help educate our employees about Medicare? Yes. We offer Medicare education through one-on-one consultations, educational workshops, webinars, and ongoing support. Our goal is to help Medicare-eligible employees make informed healthcare decisions while giving employers confidence that accurate Medicare information is being shared throughout the organization.
What are the risks of not providing Medicare education to employees? Without proper Medicare education, employees may miss important enrollment deadlines, misunderstand how Medicare coordinates with employer coverage, or make decisions that could result in lifelong late enrollment penalties or unexpected healthcare costs. Exact Benefits helps employers proactively educate their workforce to reduce confusion, improve employee experiences, and support Medicare compliance.
How can Exact Benefits help our HR team reduce Medicare-related administrative work? Exact Benefits serves as an extension of your HR and benefits team by providing Medicare expertise, answering employee questions, assisting with enrollment decisions, and offering ongoing Medicare support. This allows your HR staff to spend less time navigating complex Medicare issues while helping employees transition to Medicare with greater confidence.
