Mistake #1: Missing Your Initial Enrollment Period
The most expensive Medicare mistake is also the most preventable: failing to enroll in Part B when you first become eligible. This late enrollment penalty is 10% of the Part B premium added permanently for every 12 months of delayed enrollment without qualifying employer coverage.
Over a 20-year retirement, a 3-year delay generates a 30% permanent surcharge — roughly $13,000 in extra premiums at today's rates, for coverage you were simply slow to sign up for. The penalty never expires.
Fix: Put a reminder in your calendar 3 months before your 65th birthday. If you're still working and covered by an employer plan, confirm in writing from HR that your coverage is creditable and preserve that letter.
Mistake #2: Skipping Part D Because You 'Don't Take Medications'
Many healthy 65-year-olds skip Part D drug coverage, reasoning that they barely take any medications and don't need the expense. This logic is expensive in the long run.
The Part D late enrollment penalty accumulates at 1% per month for every month you were eligible but uncovered. Develop a chronic condition requiring expensive medications a few years after Medicare eligibility, and you'll pay the penalty on top of your drug plan premiums — permanently.
Fix: Enroll in a basic Part D plan when you first become Medicare-eligible. Entry-level plans can cost $10–$20/month. That's cheap insurance against a penalty that could cost far more if your health changes — as health tends to do over a 20-year retirement.
Mistake #3: Assuming Employer Retiree Coverage Replaces Medicare
Some retirees receive health coverage from a former employer after age 65. This is genuinely valuable — but it almost always works as secondary insurance to Medicare, not a replacement for it. If you don't enroll in Medicare Part B when eligible, your retiree plan may refuse to pay claims that Medicare would have been primary on.
The result: you thought you had coverage, but your former employer's plan says 'Medicare should have paid first' — and since you didn't enroll, the bill lands on you.
Fix: Contact your former employer's benefits department before your 65th birthday to understand exactly how their retiree plan coordinates with Medicare. Get the answer in writing and act accordingly.
Mistake #4: Not Shopping Plans Annually During AEP
Medicare plans change every year. An Advantage plan that offered your preferred doctors, your medications on its formulary, and competitive premiums in 2024 may have raised its costs, dropped your specialist, or changed drug coverage in 2025. Insurance companies are not required to notify you of these changes in a way that's easy to act on.
Many people stay on auto-pilot — same plan, every year — and gradually pay more while getting less. A 30-minute annual plan review during the Annual Election Period (October 15 – December 7) can identify hundreds or thousands of dollars in savings.
Fix: Set a calendar reminder for October 15 every year. Review your current plan's Annual Notice of Change, compare it against alternatives, and switch if a better option exists. This is one of the few times in healthcare where the system rewards active shopping.
Mistake #5: Using a National Call Center Instead of a Local Broker
National Medicare call centers — the ones with the toll-free numbers in TV commercials — are often incentivized to enroll you in specific plans, not to find the best fit for your situation. They may not know which plans have strong networks in your specific Wyoming county or Utah city, which carriers have the best service reputation locally, or which plan's drug formulary actually covers your medications.
Local, independent brokers who specialize in Wyoming and Utah know the regional market in ways that national call centers don't. They can tell you that a particular HMO doesn't cover your hospital, that a certain carrier has poor local claims service, or that a new plan entering your market is worth a look.
Fix: Work with an independent, local Medicare advisor who is licensed to sell multiple carriers in your state. They're paid by the insurance companies — not by you — so there's no cost to use their expertise. The difference in guidance quality can be significant.
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