Medicare vs. Medicare Advantage: Which Is Right for You?

Medicare decisions are among the most consequential financial choices you'll make at 65. Getting it wrong can cost you thousands — or limit your access to the doctors you trust.

Every year I help Missouri seniors navigate Medicare enrollment, and the question I hear most is: "Should I get a Medicare Supplement or Medicare Advantage?" The honest answer is that it depends on your situation. Here's a clear breakdown.

Original Medicare: The Foundation

Original Medicare (Parts A and B) is the federal program that covers most hospital stays (Part A) and doctor visits, outpatient care, and medical equipment (Part B). It covers a lot, but it leaves significant gaps — including deductibles, copays, coinsurance, and no cap on out-of-pocket costs.

That's where supplemental coverage comes in. You have two main paths: Medicare Supplement (Medigap) or Medicare Advantage (Part C).

Medicare Supplement (Medigap)

A Medicare Supplement plan works alongside Original Medicare to fill in the gaps. Depending on the plan you choose, it can cover your Part A and Part B deductibles, hospital coinsurance, and the 20% that Medicare doesn't pay for outpatient care.

The biggest advantage: You can see any doctor or specialist in the country who accepts Medicare — no referrals, no networks, no prior authorizations. This is huge for people who travel, snowbirds, or anyone who values flexibility in their care.

The trade-off: Monthly premiums are higher than Medicare Advantage. Plan G, the most popular option for new enrollees, typically runs $120–$200/month in Missouri depending on your age and carrier. But your out-of-pocket costs for covered services are very predictable — often just your Part B deductible for the year.

Medicare Advantage (Part C)

Medicare Advantage plans are offered by private insurance companies approved by Medicare. Instead of using Original Medicare directly, your coverage runs through the plan. Many Advantage plans include prescription drug coverage (Part D), dental, vision, and hearing — benefits that Original Medicare doesn't cover.

The biggest advantage: Many Medicare Advantage plans have $0 monthly premiums. For someone on a tight budget, this is genuinely attractive.

The trade-offs: You're typically limited to a network of providers. Seeing an out-of-network doctor can mean significantly higher costs or no coverage at all. Many plans require referrals to see specialists. And while the monthly premium may be low, out-of-pocket costs when you actually need care can add up quickly.

Which Is Better for You?

The Timing Matters More Than You Think

When you first enroll in Medicare Part B, you have a 6-month open enrollment window during which you can buy any Medicare Supplement plan without medical underwriting — meaning they can't deny you or charge you more based on your health history.

After that window closes, you may have to answer health questions to enroll in a Medigap plan, and you could be denied or charged more if you have pre-existing conditions. This is one of the most important reasons to plan ahead.

A Note on Prescription Drug Coverage

Original Medicare (Parts A and B) does not cover most prescription drugs. If you choose Original Medicare with a Supplement, you'll need to add a separate Part D prescription drug plan. Medicare Advantage plans often include drug coverage, but verify the formulary carefully to make sure your specific medications are covered.

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.