Let’s be honest: most people don’t choose their Medicare plan so much as they stumble into one. A neighbor recommends something. A TV commercial runs during the news. A family member says “just pick what I have.” And just like that, you’re locked into a plan that may cost you thousands of dollars more than it should — or leave you exposed when you need coverage most.
This isn’t a small problem. It’s widespread. And if you’re approaching 65 or already enrolled, there’s a good chance you’ve made at least one of these critical mistakes.
The Myth of “Free” Medicare
Here’s the first misconception that trips people up: Medicare is not free. Original Medicare (Parts A and B) covers a lot, but it doesn’t cover everything — and the gaps it leaves behind can be financially devastating without a supplemental plan.
Most people assume that once they hit 65 and enroll, they’re covered. They’re not — at least not completely. Original Medicare typically covers 80% of approved costs. That remaining 20%? It comes out of your pocket with no annual cap. A serious illness or extended hospital stay could leave you owing tens of thousands of dollars.
Understanding what Medicare covers — and what it doesn’t — is step one to making a smart decision.
The Three Paths (And Why People Get Them Wrong)
Once you enroll in Medicare, you essentially face a fork in the road. The choices you make next determine your coverage, your costs, and your flexibility for years to come.
Path 1: Medicare Advantage
Medicare Advantage (Part C) bundles your Medicare benefits into a private insurance plan. It often includes extras like dental, vision, and hearing — benefits that Original Medicare doesn’t cover. Premiums can be very low, sometimes even $0.
Sounds perfect, right?
Not so fast. The tradeoff is network restrictions. Most Medicare Advantage plans require you to use in-network providers, and prior authorizations for procedures are common. If you travel frequently, live part-time in another state, or have specialists you love, a Medicare Advantage plan could seriously limit your access to care.
The mistake people make: choosing Medicare Advantage because of the low premium and extras, without fully understanding the network limitations and out-of-pocket maximums that can kick in during a serious health event.
Path 2: Medicare Supplement (Medigap)
A Medicare Supplement plan works alongside Original Medicare to fill in the coverage gaps — that 20% coinsurance, hospital costs, and other expenses that Medicare doesn’t fully pay.
The big advantages: freedom and predictability. You can see any doctor who accepts Medicare (which is most doctors in the country), and your costs are far more predictable because the supplement picks up what Medicare leaves behind.
The tradeoff? Higher monthly premiums. And Medicare Supplement plans generally don’t include prescription drug coverage, which brings us to the third path.
The mistake people make: assuming a Medicare Supplement is “too expensive” without factoring in what they’d pay out-of-pocket on Medicare Advantage if they got seriously ill.
Path 3: Medicare Prescription Drug Plan (Part D)
If you choose Original Medicare with a Supplement, you’ll need to add a standalone Medicare Prescription Drug Plan to get help paying for your medications.
This is where people make some of the costliest errors. Many skip Part D because they’re currently healthy and don’t take many prescriptions. But here’s the problem: late enrollment penalties are permanent. If you go without creditable drug coverage and later need it, you’ll pay a higher premium for the rest of your life.
Beyond the penalty issue, people often pick the cheapest Part D plan without checking whether their specific medications are covered under that plan’s formulary. They save $10 a month on premiums and end up paying $200 more per month on their actual prescriptions.
The Annual Enrollment Trap
Medicare’s Annual Enrollment Period runs October 15 through December 7 each year. During this window, you can switch plans, drop coverage, or make changes.
Most people ignore it.
They pick a plan once, feel relief that the decision is made, and never look at it again — even as their health needs change, their prescriptions shift, or their plan’s formulary gets updated. Plans change every year. The drug that was covered at a low tier last year may now cost you significantly more. New plan options may have entered your area that better fit your situation.
Reviewing your plan annually isn’t optional — it’s essential.
5 Signs You May Have Picked the Wrong Medicare Plan
- You’ve avoided seeing a specialist because they’re out of network or require prior authorization
- Your prescription costs jumped even though nothing changed about your medication
- You’ve received an unexpected bill after a procedure you thought was covered
- You’re paying for benefits you never use (gym memberships, dental riders) while lacking coverage where it counts
- You’re planning to travel or split time between states but have a network-restricted plan
If any of these sound familiar, it’s worth doing a plan review — ideally before the next enrollment window.
What to Do Instead
The good news: picking the right plan isn’t complicated if you start with the right questions.
- What are your current medications? Run them through the plan’s formulary before you enroll.
- Who are your current doctors? Confirm they’re in-network or accept your plan.
- How often do you use healthcare? If you’re generally healthy, low premiums may make sense. If you’re a frequent healthcare user, predictable costs matter more.
- Do you travel or live part-time elsewhere? Original Medicare with a Supplement may serve you better than a network-based Advantage plan.
- What’s your financial situation? Higher premiums now vs. higher out-of-pocket costs later is a real tradeoff worth calculating.
The Bottom Line
Medicare isn’t a one-size-fits-all program, and the plan that works perfectly for your neighbor, your sibling, or the person in that TV commercial may be completely wrong for you.
The most expensive Medicare mistake isn’t always picking the highest-priced plan — it’s picking the wrong one. And millions of Americans do it every single year.
Take the time to understand your options. Compare Medicare plans side by side. Look into whether Medicare Advantage or a Medicare Supplement better matches how you actually use healthcare. And don’t forget to add a Medicare Prescription Drug Plan if you go the Original Medicare route.
Your 65-year-old self made a big decision. Your 75-year-old self will thank you for getting it right.
Have questions about your Medicare options? Explore plan comparisons and get personalized guidance at healthplansinoregon.com.
Need help? Call Health Plans in Oregon: 503-928-6918. Our assistance is at no cost to you.
