Medicare Supplement vs. Medicare Advantage: The Real Trade-Offs

This is the most important decision you'll make in Medicare — and there's no universally right answer.

Medicare Supplement (also called Medigap) works alongside Original Medicare. You pay a monthly premium, and in return, the plan covers most or all of your out-of-pocket costs. Plan G — the most popular — covers everything except the Part B deductible ($257 in 2026). You can see any doctor in the country who accepts Medicare, with no referrals needed.

Medicare Advantage replaces Original Medicare. These plans often have $0 premiums and include extra benefits like dental, vision, and hearing that Supplements don't cover. The trade-off: you're limited to a network of doctors, you may need referrals, and your costs are less predictable — copays add up if you use care often.

Choose Supplement if you have frequent medical needs, you travel often, you value predictable costs, or you want the freedom to see any specialist without a referral.

Choose Advantage if you're generally healthy, you want extra benefits at a low premium, you're comfortable with networks and copays, or keeping monthly costs low is your top priority.

One thing many agents won't tell you: switching from Advantage back to Supplement can be difficult after your Initial Enrollment Period — you may have to pass medical underwriting. It's much easier to start with Supplement and move to Advantage later than the reverse.