Turning 65 is supposed to feel like a milestone worth celebrating. But for many people, it also marks the beginning of one of the most confusing financial decisions they’ll ever face: Medicare. It’s a system full of deadlines, acronyms, and decision points that most people have never had to think about before — and getting it wrong can mean paying penalties for the rest of your life.
At Cardinal Advisors, we sit down with people navigating this exact maze every single day. And if there’s one thing we’ve learned, it’s this: the earlier you understand your options, the better your decisions will be.
The First Decision: Do You Even Need to Sign Up?
Most people assume that turning 65 means automatically enrolling in Medicare. That’s not quite true. If you or your spouse are still actively working and covered by a group insurance plan through an employer with more than 20 employees, you may be able to delay enrollment without facing a penalty. This is often referred to as “creditable coverage.”
But there are traps here. COBRA doesn’t count. Neither does Affordable Care Act marketplace coverage, even if you’re paying a premium for it. If you’re relying on either of these past age 65, you may unknowingly be setting yourself up for lifetime penalties down the road. The only real exception is active, creditable group coverage from an employer of sufficient size — nothing else qualifies.
For everyone else, Parts A and B of Medicare need to be in place, and the enrollment window opens three months before your 65th birthday.
The Second Decision: The Fork in the Road
Once you’re enrolled in Original Medicare, you arrive at what might be the single most important decision in the entire process — and it’s one many people don’t even realize they’re making. You can either:
- Stay on Original Medicare and purchase a Medicare Supplement (Medigap) plan, along with a separate Part D drug plan, or
- Leave Original Medicare and enroll in a Medicare Advantage plan instead.
This is a binary choice. You’re either on one path or the other, and switching later isn’t always simple — especially if your health has changed. We’ve seen too many people select a plan based solely on what a friend or family member has, without understanding that their situation, health, and needs may be completely different.
Medicare Advantage plans often come with lower or no monthly premiums and added perks like dental, vision, and gym memberships. But they typically involve managed care and provider networks, meaning your doctor may need approval before certain treatments, and your choice of specialists may be limited.
Original Medicare paired with a Supplement plan, on the other hand, means broader access — nearly any doctor or hospital in the country that accepts Medicare — but it comes at a cost. You’ll pay a monthly premium for the supplement itself, plus a separate premium for prescription drug coverage.
Neither option is inherently right or wrong. The right choice depends entirely on your health, your finances, and your priorities.
Why the Same Plan Can Cost Wildly Different Prices
Here’s something that surprises almost everyone: Medicare Supplement plans are standardized by the federal government. That means a Plan G from one insurance company offers the exact same coverage as a Plan G from another. The benefits don’t change. What does change is the price — and the differences can be significant, sometimes a difference of $100 or more per month for identical coverage.
This is why shopping around matters, not just when you first enroll, but every few years afterward. Insurance companies tend to raise their rates gradually over time, which means a plan that was competitively priced when you signed up may no longer be the best deal a few years later. Because the coverage itself never changes, switching companies to get a better price doesn’t cost you anything in terms of benefits.
The Overlooked Piece: Prescription Drug Coverage
If you choose the Original Medicare and Supplement route, prescription drug coverage isn’t automatically included — you’ll need a separate Part D plan. Even people who aren’t currently taking any medications are encouraged to enroll, because delaying enrollment without other qualifying coverage can trigger a lifetime penalty, just like with Part B.
Unlike Supplement plans, Part D plans are not standardized. Premiums, deductibles, and medication coverage can vary significantly from one plan to the next and can change from year to year. This makes an annual review during the open enrollment period, October 15th through December 7th, well worth the time.
The Real Takeaway: This Isn’t a “Set It and Forget It” Decision
Perhaps the biggest misconception about Medicare is that it’s a decision you make once and never revisit. In reality, your needs, your health, and the insurance marketplace all change over time. A plan that made perfect sense at 65 may not be the most cost-effective option at 70 or 75.
Reviewing your coverage every two to four years — checking pricing, confirming you’re still in the right plan type, and making sure nothing has changed in your circumstances — can lead to meaningful savings without sacrificing any coverage.
Medicare doesn’t have to be a maze you navigate alone. Understanding the decision points, knowing the deadlines, and revisiting your choices periodically can make all the difference between a plan that quietly overcharges you for years and one that truly serves your needs.
If you’re approaching 65, or you’ve been on Medicare for years and haven’t reviewed your coverage recently, now is a good time to take a closer look.
