Let’s be honest: figuring out medicare part d coverage can feel a bit like trying to solve a Rubik’s Cube in the dark. You know there’s a solution, but every time you think you’ve got the colors lined up, something shifts!
I’m Gemma Sambi, and I see this every single day. People work so hard to prepare for retirement, only to get tripped up by the fine print of prescription drug plans. Whether you’re just turning 65 or you’ve been on Medicare for years, the rules for Part D change constantly. In 2026, those changes are even more significant.
The good news? You don’t have to be a pharmacist or an insurance actuary to get this right. You just need to know which pitfalls to avoid. Let’s walk through the seven most common mistakes people make with their medicare part d coverage and, more importantly, how you can fix them today.
1. The "I'll Wait Until I'm Sick" Strategy
The Mistake: Thinking you don't need drug coverage because you don't currently take any prescription medications.
I hear this a lot: "Gemma, I only take a multivitamin. Why should I pay for a plan I'm not using?" It sounds logical, right? But Medicare looks at Part D as a form of "just in case" protection. If you go 63 days or more without "creditable" prescription drug coverage after your initial enrollment window closes, Medicare will hit you with a Late Enrollment Penalty.
This isn't a one-time fine. It’s a permanent monthly surcharge added to your premium for as long as you have Medicare. It’s calculated as 1% of the "national base beneficiary premium" for every month you were eligible but didn't enroll.
How to Fix It: Even if you’re as healthy as a horse, it’s usually smart to enroll in the lowest-cost "silver" or basic plan available in your area during your Initial Enrollment Period. Think of it as a low-cost insurance policy against future penalties. You can learn more about avoiding Medicare penalties to keep your costs down in the long run.
2. Falling in Love with a Low Premium
The Mistake: Choosing a plan based solely on the monthly "sticker price."
It’s tempting to sort your options by "Lowest Monthly Premium" and click buy. But the premium is just the "cover charge" to get into the dance. The real costs often happen at the pharmacy counter. A plan with a $0 or $15 monthly premium might have a massive deductible or high "coinsurance" (a percentage of the drug cost) for the specific medications you need.
Statistically, folks who pick the lowest premium without looking at the details can end up overspending by hundreds of dollars a year.
How to Fix It: You need to look at the Total Annual Cost. This is the sum of 12 months of premiums + your annual deductible + your estimated copays. When I help clients, we run their specific list of medications through the system to see which plan actually costs the least over a full year. You can start comparing these total costs yourself at PlanEnroll.
3. Ignoring the "Formulary" (The Secret List)
The Mistake: Assuming every Medicare plan covers every drug.
Every insurance company has a Formulary, which is just a fancy word for the list of drugs they agree to cover. These lists are broken into "Tiers."
- Tier 1: Preferred Generics (usually the cheapest).
- Tier 5: Specialty Drugs (usually the most expensive).
If your medication isn't on that plan's formulary, you might have to pay the full retail price out of pocket. That could be the difference between a $10 copay and a $500 bill!
How to Fix It: Before you sign anything, double-check that your specific dosages and frequencies are covered. Formularies can change every single year. Just because your heart medication was covered in 2025 doesn't guarantee it’s on the list for 2026. If you're feeling overwhelmed, checking the Medicare basics can help you understand how these parts fit together.
4. Playing "Copycat" with Your Spouse
The Mistake: Signing up for the exact same plan as your husband or wife just because it’s easier.
In the world of health insurance, being a "couple" doesn't usually get you a discount on Part D. More importantly, you and your spouse are two different people with different health needs. If your husband takes a brand-name blood thinner and you only take a generic blood pressure pill, the "best" plan for him might be the most expensive mistake for you.
How to Fix It: Shop as individuals! It’s perfectly normal (and often much cheaper) for a husband and wife to be on completely different Part D plans from different insurance companies. Each of you should have your own account and run your own drug list. You can explore different plan options here to see how they vary.
5. Setting Your Plan on "Autopilot"
The Mistake: Letting your plan renew year after year without checking the updates.
This is probably the most common mistake I see. "I like my plan, it worked fine last year, so I’ll just let it roll over."
Here is the catch: Insurance companies change their prices, their drug lists, and their "preferred" pharmacies every year. Your plan might have been a 5-star value in 2024, but by 2026, it could have raised the deductible or moved your primary medication to a higher cost tier.
How to Fix It: Mark your calendar for the Annual Enrollment Period (AEP), which runs from October 15th to December 7th. This is your "Golden Window" to switch plans without any questions asked. Every September, you’ll receive an "Annual Notice of Change" (ANOC) in the mail. Don’t throw it away! It tells you exactly how your plan is changing for the coming year.
6. Not Factoring in the Pharmacy Network
The Mistake: Thinking you can go to any pharmacy and pay the same price.
Most medicare part d coverage plans have "preferred" and "standard" pharmacies. If you take your prescription to a pharmacy that is outside your plan’s preferred network, your copay could double or even triple. Some plans also offer significant savings if you use their mail-order service for 90-day supplies.
How to Fix It: When searching for a plan, make sure your favorite local pharmacy is listed as a "Preferred Pharmacy." If you’re willing to switch from the big-box store to a local one (or vice versa), you might save a bundle. You can check out more tips on enrollment to see how pharmacy choice affects your wallet.
7. Forgetting About "Extra Help"
The Mistake: Paying full price when you might qualify for financial assistance.
Many people are struggling to pay for their medications but don't realize that the Social Security Administration has a program called Extra Help (also known as the Low-Income Subsidy). If you qualify, it can pay for your Part D premiums, deductibles, and significantly lower your copays.
How to Fix It: If your income and resources are below certain limits, you should absolutely apply. It’s not "welfare", it’s a benefit you’ve earned to ensure you can afford the life-saving meds you need. You can find more resources and guides on the PlanEnroll learning center.
You Don't Have to Do This Alone!
If reading all of this makes your head spin, take a deep breath. You are not supposed to be an expert in insurance, that’s my job!
Choosing the right medicare part d coverage is about more than just picking a name off a list. It’s about making sure you can afford your medications so you can get back to doing what you love, whether that’s traveling, spending time with the grandkids, or finally starting that garden.
At Gemma Sambi Insurance Services, I pride myself on being a friendly, local resource you can actually talk to. No "press 1 for English," just real help from someone who cares about your health and your budget.
Ready to find the perfect plan for 2026?
- Give me a call: 415-634-4189
- Visit my PlanEnroll page to compare plans: https://planenroll.com/?purl=gemma-sambi
Let's get those prescriptions covered so you can stop worrying and start living!
Legal Disclaimer: We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options. Gemma Sambi Insurance Services is a licensed insurance agency and is not affiliated with or endorsed by the government or the federal Medicare program.
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