Medicare Supplement vs. Medicare Advantage: Which Is Right for You?
These are the two main paths beyond Original Medicare. They’re fundamentally different in how they work — here’s how to think through which one actually fits your situation.
The Core Difference
A Medicare Supplement (Medigap) plan works alongside Original Medicare. Medicare pays first, and your Medigap plan covers some or all of what Medicare leaves behind. You keep full access to any provider that accepts Medicare — no networks, no referrals.
Medicare Advantage replaces Original Medicare. A private insurer manages your benefits and you access care through their network. Most plans bundle drug coverage and extra benefits like dental and vision.
| Feature | Medicare Supplement (Medigap) | Medicare Advantage |
|---|---|---|
| How it works | Works alongside Original Medicare | Replaces Original Medicare |
| Monthly premium | Higher ($100–$250+/mo typical) | Lower (often $0–$80/mo) |
| Cost when you use care | Predictable — near-zero on Plan G | Copays & coinsurance each visit |
| Provider access | Any provider accepting Medicare | In-network only (HMO/PPO) |
| Referrals needed | No | Often yes (HMO plans) |
| Drug coverage | Must add Part D separately | Usually bundled in |
| Dental/Vision/Hearing | Not included | Often included |
| Out-of-pocket maximum | Near-zero on Plan G | Up to $9,350/year (2026) |
| Switching later | Switch carriers annually (MO only) | May face underwriting to switch to Medigap |
Who Each Tends to Fit
Medigap tends to fit if you:
- Have ongoing health conditions or frequent specialist visits
- Want to see any doctor in the country without network restrictions
- Want your out-of-pocket costs to be as predictable as possible
- Travel frequently or spend time in multiple states
- Are in Missouri (Anniversary Rule lets you switch annually)
- Value simplicity — no prior authorizations, no referrals
Advantage tends to fit if you:
- Want the lowest possible monthly premium
- Are in good health and use healthcare infrequently
- Value bundled dental, vision, and hearing coverage
- Your preferred doctors are in the plan’s network
- Stay local — don’t travel seasonally or frequently
- Understand the trade-off on cost-sharing and networks
The Decision That’s Hard to Reverse
The most important thing to understand: switching from Medicare Advantage back to a Medigap plan is often difficult. In most states (including Kansas), if you try to switch to a Medigap plan after your initial guaranteed issue window, you’ll face medical underwriting — meaning you can be denied or charged more based on your health history.
Missouri’s Anniversary Rule helps — but only for switching between Medigap carriers, not from Advantage to Medigap. This makes your initial enrollment decision especially consequential.
Not sure which path is right for you? We’ll go through your health history, budget, and priorities to give you a clear, unbiased recommendation.
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