If you're turning 65 or already on Medicare, you've probably seen the ads.
One promises free dental, vision, and a gym membership.
Another warns that you'll be buried in medical bills without extra coverage.
Both are selling you something, and the gap between them can run into thousands of dollars a year.
Original Medicare (Parts A and B) covers hospital stays and doctor visits, but it leaves you on the hook for 20% of most outpatient costs with no annual cap.
To handle that gap, you pick one of two paths: a Medicare Advantage plan (Part C), or a Medicare Supplement plan, often called Medigap.
Medicare Advantage works like an HMO or PPO.
A private insurer bundles your hospital and doctor coverage into one plan, usually with a low or $0 monthly premium.
You generally stay in a network, you may need referrals, and every service comes with copays.
There's an annual out-of-pocket maximum, but in 2024 it can reach $8,850 for in-network care.
You keep Original Medicare and add a supplement that picks up most of what Medicare doesn't pay.
You can see any doctor nationwide who accepts Medicare, and you don't need referrals.
The catch is the premium, which commonly runs $100 to $200 or more per month depending on your plan letter, age, and state.
When you first enroll in Medicare Part B, you get a six-month Medigap open enrollment window.
During that window, insurers in most states must sell you any policy they offer at the same price, regardless of your health history.
Miss it, and you can be denied or charged more because of a pre-existing condition.
That matters because switching later is not simple.
Once you're on Medicare Advantage, most states let you move back to Original Medicare during certain enrollment periods, but getting a Medigap policy afterward often requires medical underwriting.
A cancer diagnosis, heart condition, or even treated diabetes can trigger a denial or a higher rate.
If you're healthy, cost-focused, and don't mind networks, Medicare Advantage can keep monthly costs low.
If you travel, want predictable bills, or have ongoing medical needs, Medigap often pays for itself.
A single hospital stay can wipe out a year of premium savings.
Do the math with your own doctors and prescriptions, not a commercial.
Call each plan, confirm your physicians are in network, and check your drug costs on the plan's formulary.
These three questions catch most of the expensive surprises.
Dental and vision benefits on Advantage plans are often capped at a few hundred dollars a year, which won't cover a crown or a new pair of glasses.
The gym membership is real, but it's not why you buy coverage.
One more thing: compare total yearly cost, not the monthly premium.
Add premiums, deductibles, copays, and the worst-case out-of-pocket max.
That number, not the ad, tells you which plan actually protects your wallet.
The honest take: there's no universal winner here, only a winner for your health situation and budget.
The people who get burned are usually the ones who picked on premium alone and never checked the network.
Final Thoughts
Spend an hour with a licensed counselor at your state's SHIP program before you decide, because this choice locks in for a year at a time.