Medicare Supplement vs Medicare Advantage: Which Plan Is Right for You
Medicare Supplement vs Medicare Advantage: Which Plan Is Right for You
This is the single biggest decision new Medicare beneficiaries face — and it's one you make with limited information and a tight timeline. Original Medicare with a Medigap supplement, or Medicare Advantage? Each path has real tradeoffs in cost, flexibility, and risk.
Here's what actually matters.
The Core Difference
Original Medicare + Medigap: You keep Parts A and B as your primary insurance. Medicare pays 80% of approved charges; a Medigap plan covers most or all of the remaining 20%. You can see any doctor or hospital in the country that accepts Medicare — no network, no referrals. You add a separate Part D plan for prescriptions.
Medicare Advantage (Part C): A private insurer replaces Original Medicare. The plan bundles Parts A, B, and usually D into one package. Most plans include extras like dental, vision, and hearing. But you're locked into the plan's provider network and may need referrals to see specialists.
Side-by-Side Comparison
| Factor | Original Medicare + Medigap | Medicare Advantage |
|---|---|---|
| Monthly cost | Part B premium + Medigap premium ($100–$300/month depending on plan and location) + Part D premium | Part B premium + MA plan premium ($0–$100/month for most plans) |
| Doctor choice | Any Medicare-accepting provider in the US | Plan's network only (HMO) or out-of-network at higher cost (PPO) |
| Out-of-pocket maximum | No cap on Original Medicare alone; Medigap Plan G covers nearly everything after the Part B deductible | Required by law — typically $3,500–$8,000/year |
| Prescription drugs | Separate Part D plan required | Usually included |
| Extra benefits | None | Often includes dental, vision, hearing, gym memberships |
| Prior authorization | Rarely required | Frequently required — 49.8 million determinations across MA plans in 2023 |
| Travel coverage | Works nationwide | Limited outside service area |
When Medigap Makes More Sense
- You travel frequently or live in multiple states — Original Medicare works everywhere. Medicare Advantage networks are local.
- You want predictable costs — Medigap Plan G, the most popular supplement, covers everything except the annual Part B deductible ($283 in 2026). Your total out-of-pocket is almost completely predictable.
- You see multiple specialists — no referrals, no prior authorization, no network restrictions.
- You're in rural areas — Medicare Advantage networks are thinner outside metro areas. If your nearest in-network specialist is two hours away, that "free" premium doesn't save you much.
Free Download
Get the Medicare Enrollment Guide: When and How to Sign Up — Quick-Start Checklist
Everything in this article as a printable checklist — plus action plans and reference guides you can start using today.
When Medicare Advantage Makes More Sense
- Budget is the top priority — many MA plans have $0 monthly premiums beyond the Part B payment. If you're healthy and rarely use medical services, the cost savings can be substantial.
- You want bundled coverage — one card for medical, drugs, dental, and vision instead of managing three separate policies.
- You prefer an out-of-pocket cap — Original Medicare has no maximum out-of-pocket limit. MA plans are legally required to cap your annual costs.
- Your doctors are in-network — if your preferred providers are in the plan's network, the restrictions don't affect you.
The Medigap Timing Window You Can't Miss
Medigap Open Enrollment is a one-time, 6-month window starting the first month your Part B is active and you're 65 or older. During this window, every Medigap insurer must sell you any plan they offer — no medical underwriting, no health questions, no denial for pre-existing conditions.
After this window closes, insurers can reject you, charge higher premiums based on health status, or impose waiting periods for pre-existing conditions. In most states, there's no guaranteed right to buy Medigap after the open enrollment period ends.
This is why the decision matters so much at enrollment time. If you choose Medicare Advantage first and later want to switch to Original Medicare with Medigap, you may not be able to get a supplement — or it could cost significantly more.
How to Compare Plans in Your Area
Use Medicare's official Plan Finder at medicare.gov/plan-compare. Enter your ZIP code, medications, and preferred doctors to see available Medicare Advantage and Part D plans with estimated costs. For Medigap plans, your state insurance department's website lists available plans and carriers.
The Medicare Enrollment Guide walks through the full plan comparison framework — including a side-by-side worksheet, the Medigap enrollment timeline, and the specific scenarios where switching between MA and Original Medicare is still possible.
Get Your Free Medicare Enrollment Guide: When and How to Sign Up — Quick-Start Checklist
Download the Medicare Enrollment Guide: When and How to Sign Up — Quick-Start Checklist — a printable guide with checklists, scripts, and action plans you can start using today.