A single Medicare myth can cost you thousands. I hear the same wrong beliefs over and over, and most of them come from a friend, a relative, or something someone read in 2008. Here are the 10 most expensive ones, and the real facts you need to know in 2026.
1. "Medicare is free once I turn 65."
This is the number one myth, and it is the one that stings the most. Part A, which pays for hospital stays, is usually premium-free if you worked 10 years in the United States. The rest of Medicare costs real money.
In 2026, the standard Part B premium is $202.90 a month. On top of that you have deductibles, the 20% coinsurance on doctor visits, and a Part D drug plan premium. If you add a Medicare Supplement or an Advantage plan, that is another monthly cost.
The average Medicare household spends between $3,000 and $7,000 a year on healthcare. People who think it's free get a cold shock when the Social Security deductions start. For a full breakdown, see our guide to what Medicare really costs in 2026.
2. "I'll be enrolled in Medicare automatically at 65."
Only true for some people. If you already draw Social Security benefits before you turn 65, Medicare mails you a card and signs you up for Part A and Part B. Easy.
If you have not started Social Security yet, nobody signs you up. You need to enroll on your own at ssa.gov during your Initial Enrollment Period. That window is seven months long. It starts three months before the month you turn 65 and ends three months after.
Miss it and you can face a lifelong Part B late penalty. The penalty is 10% for each full 12 months you were late. It sticks to your Part B premium forever.
3. "I can wait to enroll if I have employer coverage."
Only safe at a company with 20 or more employees. That is the magic number. If your employer has 20 or more workers, your group plan stays primary and you can delay Part B without a penalty.
If your employer has fewer than 20 workers, Medicare becomes the primary payer at 65. If you do not sign up on time, the group plan might pay almost nothing on your claims. You could get stuck with huge bills and a late penalty on top.
COBRA and retiree coverage do not count as active employer coverage. You still need to sign up for Medicare on time. Same with the TRICARE for Life trap: it only works alongside Part B.
4. "Medicare covers long-term care."
This is the costliest myth on the list. Medicare pays for short-term skilled nursing care, up to 100 days, after a qualifying hospital stay. That is it.
Long-term custodial care, the kind where someone helps you dress, bathe, and eat, is not covered by Medicare. Not in a nursing home, not at home, not in assisted living. A private room in a nursing home runs about $120,000 a year in 2026. Medicare pays zero of that.
The three ways to cover long-term care are paying out of pocket, buying long-term care insurance before you need it, or qualifying for Medicaid once your assets are mostly gone. Learn more about the 100-day skilled nursing rule.
5. "Medicare and Medicaid are the same thing."
They sound alike. They are not the same.
Medicare is a federal program based on age or disability. You qualify at 65 or earlier for certain conditions. Income does not matter. Medicaid is a joint federal and state program based on income and assets. You qualify when your resources fall below your state's limits.
Some people have both. That is called being "dual eligible." If you qualify for Medicaid along with Medicare, you can get your Part B premium paid for you and extra help with drug costs. If a neighbor says their Medicare is free, they probably mean they are on both programs.
6. "If I like my plan, it won't change."
Every single Medicare Advantage and Part D plan can change every year. New copays, new drug tiers, new doctors in or out of network, new benefit rules. The insurance company sends an Annual Notice of Change, called the ANOC, by September 30.
Most people throw the ANOC in a drawer. Then they are shocked in January when their favorite doctor is out of network or their blood pressure drug costs $85 instead of $5. Read the letter every year. See our ANOC walkthrough for what to look for.
7. "Medicare Advantage is just a better version of Medicare."
Not for everyone. Medicare Advantage replaces Original Medicare with a private plan. The premiums are low, often zero, and most plans add dental, vision, and gym perks. That part sounds great.
The trade-off is networks and prior authorization. You use the plan's doctors, not every Medicare doctor in the country. Big procedures often need the plan's permission first. If the plan says no, you can appeal, but the delay is real.
Original Medicare plus a Supplement gives you any doctor who takes Medicare, nationwide, with no prior auth. Both options have fans. One is not simply better than the other. See our Advantage vs Medigap comparison for the full picture.
8. "I can switch Medicare plans anytime I want."
You can shop anytime. You can enroll only during set windows.
Here are the main ones. The Annual Enrollment Period runs October 15 to December 7 every year. You can change Advantage or Part D plans here. The Medicare Advantage Open Enrollment Period runs January 1 to March 31. You can switch from one Advantage plan to another, or drop Advantage and go back to Original Medicare.
Special Enrollment Periods open when you move, lose coverage, or your plan is sanctioned. Medicare Supplements are a different animal. You can usually apply for a Supplement anytime, but after your first six months on Part B you have to pass medical underwriting.
9. "Supplement plans are too expensive to be worth it."
Not usually. In 2026, a healthy 65 year old can often buy Medigap Plan G for $130 to $180 a month. In exchange, your out-of-pocket costs on medical care drop to near zero for the whole year.
Compare that to an Advantage plan with a $8,850 in-network max out of pocket. If you have one bad hospital year on Advantage, you could spend thousands. Plan G caps most of that risk.
The real question is not whether a Supplement is cheap. It is whether the premium is worth the peace of mind for your health. For many seniors, it is.
10. "Dental, vision, and hearing are covered by Medicare."
Original Medicare covers almost none of this. No routine cleanings. No glasses. No hearing aids. Medicare only steps in for medically necessary dental linked to another procedure, or for vision care tied to a disease like cataracts or glaucoma.
Most Advantage plans add some dental, vision, and hearing benefits. The amounts are limited, like $1,500 a year on dental, and the networks are small. If dental matters to you, a standalone dental plan might cover more than the Advantage perk.
See the full breakdown in our dental, vision, and hearing guide.
The bottom line
Medicare is a strong program, but it is full of small rules that trip people up. Every myth on this list has cost a real client real money. The fix is simple. Ask questions before you commit. Read your ANOC letter. Call an independent agent who gets paid the same no matter which plan you pick.
Need help sorting out what applies to your situation? Book a free call with Keith or check the Medicare.gov site for the official rules.
Frequently asked questions
Is Medicare really free when I turn 65?
No. Part A is premium-free for most workers, but Part B costs $202.90 a month in 2026. The average senior spends $3,000 to $7,000 a year on Medicare costs.
Will I be enrolled in Medicare automatically at 65?
Only if you draw Social Security before 65. Otherwise you must sign up yourself during your Initial Enrollment Period.
Can I delay Medicare if I have employer coverage?
Only safely if the employer has 20 or more workers. COBRA and retiree plans do not shield you from the late penalty.
Does Medicare cover long-term care?
No. Medicare pays short-term skilled care up to 100 days. Nursing homes and in-home custodial care are not covered.
Can I switch Medicare plans anytime?
Only during the Annual Enrollment Period, Advantage Open Enrollment, or a Special Enrollment Period.
Does Medicare cover dental, vision, and hearing?
Original Medicare covers almost none of it. Advantage plans add limited benefits, or you can buy a standalone policy.