Medicare Advantage vs. Medicare Supplement: Which Is Right for You?
Medicare Advantage vs. Medicare Supplement: Which Is Right for You?
By Rodney Cummings, RSSA® | Legacy Wealth Services
If you’re turning 65 or approaching Medicare eligibility, you’ve probably run into this question: Medicare Advantage or Medicare Supplement? It’s one of the most important decisions you’ll make in retirement — and it’s one that millions of people get wrong simply because they don’t have the full picture.
This guide breaks it down clearly so you can make the right choice for your health, your lifestyle, and your budget.
First, a Quick Foundation: What Is Original Medicare?
Original Medicare has two parts:
- Part A — Hospital insurance (inpatient care, skilled nursing facility, hospice)
- Part B — Medical insurance (doctor visits, outpatient care, preventive services)
The problem? Original Medicare covers roughly 80% of your costs after deductibles. That leaves a potentially significant 20% gap — with no out-of-pocket maximum. A serious illness or surgery could cost you tens of thousands of dollars.
That’s where Medicare Supplement and Medicare Advantage come in. They’re two very different approaches to filling that gap.
Medicare Supplement (Medigap): The “Full Coverage” Approach
A Medicare Supplement plan — also called Medigap — works alongside Original Medicare to cover most or all of the costs Medicare doesn’t pay.
How It Works
You keep Original Medicare as your primary insurance. Your Medigap policy acts as a secondary payer, picking up copays, coinsurance, and deductibles that Medicare leaves behind.
Key Benefits
- Predictable costs — Most plans (especially Plan G) cover nearly everything after one annual deductible
- Any doctor, anywhere — Use any provider that accepts Medicare in the U.S. No networks, no referrals
- No prior authorization headaches — If Medicare approves it, your Supplement pays
- Travel-friendly — Some plans include foreign travel emergency coverage
- Guaranteed renewable — As long as you pay premiums, they can’t cancel your coverage
The Tradeoff
- Higher monthly premiums — You pay more each month in exchange for lower out-of-pocket costs
- Prescription drugs not included — You’ll need a separate Part D drug plan
- Underwriting after open enrollment — If you miss your initial enrollment window, you may need to qualify medically in most states
Best Medicare Supplement Plan: Plan G
Plan G has become the gold standard since Plan F was discontinued for new enrollees in 2020. It covers everything except the Part B deductible (~$240/year). After that deductible, you have essentially zero out-of-pocket exposure for Medicare-covered services.
Medicare Advantage (Part C): The “All-in-One” Approach
Medicare Advantage plans are offered by private insurance companies approved by Medicare. Instead of using Original Medicare directly, you get your benefits through the plan.
How It Works
You still have Medicare, but the private plan takes over administering your benefits. Most Advantage plans bundle Part A, Part B, and Part D (drug coverage) into one plan — and many include extra benefits like dental, vision, and hearing.
Key Benefits
- Low or $0 monthly premiums — Many plans have no additional premium beyond Part B
- Extra benefits — Dental, vision, hearing, fitness memberships, over-the-counter allowances
- All-in-one simplicity — Medical and drug coverage in one card
- Out-of-pocket maximum — Plans cap your annual exposure (typically $4,000–$8,000/year in-network)
The Tradeoff
- Network restrictions — HMO plans require you to use network providers; PPO plans cost more out-of-network
- Prior authorizations — Many services require advance approval from the plan
- Variable out-of-pocket costs — Copays and coinsurance add up, especially with frequent care
- Plans change annually — Benefits, premiums, and formularies can change every year
- Geographic limitations — You generally need to be in the plan’s service area
Side-by-Side Comparison
| Factor | Medicare Supplement | Medicare Advantage |
|---|---|---|
| Monthly premium | Higher ($100–$300+/mo) | Low or $0 |
| Out-of-pocket costs | Very low/predictable | Variable, can be significant |
| Doctor choice | Any Medicare provider nationwide | Network-based (HMO/PPO) |
| Referrals needed | No | Often yes (HMO) |
| Drug coverage | Separate Part D plan needed | Usually included |
| Extra benefits (dental/vision) | No | Often yes |
| Prior authorization | Rarely | Common |
| Best for | Frequent healthcare users, travelers, those wanting certainty | Healthy individuals, budget-conscious, those who like extra benefits |
Who Should Choose Medicare Supplement?
Medicare Supplement is typically the better choice if you:
✅ See specialists regularly or have chronic conditions
✅ Travel frequently or spend time in multiple states
✅ Want predictable, budget-able healthcare costs
✅ Value freedom to choose any doctor without referrals
✅ Have the budget for higher monthly premiums
✅ Live in a rural area with limited Advantage plan networks
Who Should Choose Medicare Advantage?
Medicare Advantage may be the better fit if you:
✅ Are relatively healthy and don’t use healthcare frequently
✅ Want to minimize monthly premium costs
✅ Value extra benefits like dental and vision coverage
✅ Are comfortable with network-based care
✅ Live in an urban area with strong plan options
✅ Want the simplicity of one plan card
The $0 Premium Trap: What Advantage Marketers Don’t Tell You
Medicare Advantage is heavily marketed — you’ve probably seen the TV commercials and received the mailers. The $0 premium is real, but it can be misleading.
Here’s what those ads don’t emphasize:
- A $0 premium plan with a $6,500 out-of-pocket maximum means you could owe thousands in a serious health year
- Network restrictions mean your current doctor may not be in-network
- Prior authorization denials are a frequent complaint — care you need may be delayed or denied
- Plans change every year — the plan you loved in 2024 may look very different in 2025
This doesn’t mean Advantage plans are bad. For the right person, they’re excellent. But going in with clear eyes matters.
Can You Switch Later?
From Advantage to Supplement: You can switch during Medicare’s Annual Enrollment Period (October 15 – December 7), but in most states you’ll need to pass medical underwriting to get a Supplement plan. If you have health conditions that developed while on Advantage, you may find it difficult or impossible to get Supplement coverage.
From Supplement to Advantage: Generally easier — you can switch during Annual Enrollment or Special Enrollment Periods.
Takeaway: If you’re newly eligible for Medicare, your Initial Enrollment Period is the best time to choose a Supplement plan without underwriting. Missing that window can close the door on Supplement plans permanently.
Oregon-Specific Considerations
Oregon residents have some unique advantages:
- Birthday Rule — Oregon is one of a small number of states that allows Medigap enrollees to switch to a plan with equal or lesser benefits during their birthday month, regardless of health status. This gives Oregon residents more flexibility than most states.
- Strong carrier competition — Oregon has robust competition among Medicare carriers, which keeps Supplement premiums competitive.
- Statewide Advantage options — Many areas of Oregon have strong Medicare Advantage networks, though rural areas may have fewer options.
The Bottom Line: There’s No Universal Right Answer
The “best” Medicare plan depends entirely on your health, finances, lifestyle, and priorities. Anyone who tells you one is universally better than the other isn’t giving you the full picture.
What I recommend: Run the numbers for your specific situation. Compare the actual plans available in your area, factor in your prescriptions and doctors, and calculate your realistic annual cost under each scenario.
Get a Free, No-Pressure Medicare Review
As an independent Medicare advisor licensed in 22+ states, I work with all the major carriers — Aetna, Humana, UnitedHealthcare, Mutual of Omaha, Cigna, and more. I don’t favor one carrier over another. My job is to find the right fit for you.
Schedule your free 30-minute Medicare review:
- 📅 Book online at Calendly
- 📞 Call or text: 503-832-8555
- ✉️ Email: rod@legacywealthservices.com
Rodney Cummings, RSSA® is an independent Medicare advisor and Registered Social Security Analyst serving clients in Oregon, Washington, and 22+ states nationwide. Oregon Insurance License #18847712.