Two very different ways to cover what Original Medicare leaves behind. Here's how the costs, networks, and trade-offs actually compare — in plain English, from a licensed Texas advisor. No cost to you.
If predictable costs, any-doctor freedom, and low out-of-pocket at the point of care matter most, Medigap (Medicare Supplement) is usually the fit. If a $0 or low monthly premium with bundled prescriptions, dental, vision, and hearing matters more, Medicare Advantage is usually the fit. The right answer depends on your doctors, your prescriptions, how often you travel, and your budget.
| Feature | Medigap (Supplement) | Medicare Advantage (Part C) |
|---|---|---|
| Monthly premium | Higher — typically $100–$300+ (plus Part B premium) | Often $0–$50 (plus Part B premium) |
| Out-of-pocket max | Not needed — the plan covers most cost-sharing | Yearly cap set by plan (2025 max: $9,350 in-network) |
| Doctor & hospital access | Any U.S. provider that accepts Original Medicare | Plan network (HMO or PPO); out-of-network limited or not covered |
| Referrals to see specialists | Not required | Often required (HMO plans) |
| Prescription drugs (Part D) | Not included — buy a standalone Part D plan | Usually bundled in |
| Dental, vision, hearing | Not included | Often included as extras |
| Travel coverage | Works nationwide; some plans include foreign travel emergency | Emergencies only outside service area |
| Medical underwriting | Only during your one-time Medigap Open Enrollment; later switches may require it | Never — guaranteed issue at eligibility |
| Cost predictability | Very predictable — pay premium, little at the point of care | Variable — copays and coinsurance as you use care |
Missing your Medigap Open Enrollment window. The 6 months after you enroll in Part B at 65 is the one time Medigap carriers must accept you regardless of health. Miss it and switching later can mean underwriting — higher rates or denial.
Assuming you can switch anytime. You can leave Medicare Advantage during the Annual Enrollment Period (Oct 15 – Dec 7) or the Medicare Advantage Open Enrollment Period (Jan 1 – Mar 31), but moving to Medigap outside a guaranteed-issue window may require underwriting.
Forgetting Part D with Medigap. Medigap doesn't cover prescriptions. Enroll in a standalone Part D plan during your Initial Enrollment Period or face a lifetime late-enrollment penalty.
Choosing on premium alone. A $0 premium plan can cost more overall than a Medigap plan if you use a lot of care. Compare the total annual cost — premium plus expected out-of-pocket — not just the monthly bill.
Medicare Advantage usually has a lower monthly premium — often $0 — but you pay copays and coinsurance as you use care, up to a yearly out-of-pocket max. Medigap has a higher monthly premium but covers most of Original Medicare's cost-sharing, so you pay very little at the point of care. Which is cheaper for you depends on how much healthcare you use.
You can switch during Medicare's Annual Enrollment Period (Oct 15 – Dec 7) or the Medicare Advantage Open Enrollment Period (Jan 1 – Mar 31). But outside of your one-time Medigap Open Enrollment (the 6 months after you enroll in Part B at 65), Medigap carriers can use medical underwriting and deny you or charge more based on health. That's the biggest reason to choose carefully at 65.
No. Medigap does not include Part D prescription drug coverage — you buy a standalone Part D plan alongside it. Most Medicare Advantage plans bundle Part D in.
Medicare Advantage plans use provider networks and typically only cover emergencies outside the plan's service area. Medigap works with any doctor in the U.S. that accepts Original Medicare, which is why frequent travelers and snowbirds often prefer it.
Take the 2-minute plan quiz or call — I'll compare real plans against your doctors, prescriptions, and budget. No cost, no pressure.