What is the main difference between Medigap and Medicare Advantage?

Medigap (Medicare Supplement) works alongside Original Medicare, paying most of what Medicare leaves behind, and lets you see any doctor in the country who accepts Medicare. Medicare Advantage replaces Original Medicare with a private plan that usually bundles hospital, medical, and drug coverage, often includes extra benefits like dental and vision, and generally requires using a network of doctors.

Can I switch from Medicare Advantage to a Medigap plan later?

You can apply, but outside your initial Medigap enrollment window or a qualifying guaranteed-issue event, insurers in most states can medically underwrite your application, meaning they can charge more or decline coverage based on your health. A few states have their own rules that allow easier switching. This is worth reviewing with an agent before you decide.

Care at 65 · Medicare Decision Guide

Medigap or Medicare Advantage?

Both plans cover what Original Medicare leaves behind. The real question isn't which one is better, it's which trade-off fits how you use healthcare.

This page is for education, not a recommendation. It reflects general patterns, not a specific plan or a specific person's coverage. Costs, networks, and rules vary by carrier, plan, and state. The right call depends on your doctors, your health, and your budget, which is exactly what a conversation is for.

Brian Maiz · Independent Medicare Agent

NPN #2842886 · This is the single most common question I get on a first call. Here's how I actually walk people through it.

The core trade-off

Neither plan is the wrong choice. Each one asks you to give up something for something else.

Medicare Supplement (Medigap)

Predictability, and your choice of doctor

＋ See any doctor in the country who accepts Medicare, no referrals, no network
＋ Fills most of the cost-sharing gaps Original Medicare leaves open
＋ Coverage doesn't change year to year the way plan offerings can
－ Monthly premium on top of Part B, typically the highest of the two
－ Needs a separate Part D plan for prescriptions
－ Applying outside your initial window can mean medical underwriting in most states

Medicare Advantage

Bundled coverage, built-in extras

＋ Often $0 monthly premium beyond what you already pay for Part B
＋ Usually bundles drug coverage, and often dental, vision, and hearing
＋ Comes with an annual out-of-pocket maximum, up to $9,250 in 2026
－ Generally requires using a network of doctors and hospitals
－ Some care may need a referral or prior authorization
－ Plan benefits and networks can change from year to year

Why Original Medicare alone rarely feels like enough: Part B covers 80% of most outpatient care with no annual cap on the 20% you're responsible for. Both Medigap and Medicare Advantage exist to solve that same gap, they just solve it in different ways.

A general sense of fit

These are patterns, not rules. Your actual situation can point a different direction.

Medigap tends to fit people who

Care about flexibility Travel often, split time between states, or want to keep seeing specific doctors and specialists without worrying about network status.

Value knowing the number Manage a chronic condition, see doctors regularly, or simply prefer a predictable monthly cost over the possibility of a lower bill most years.

Medicare Advantage tends to fit people who

Want built-in extras Are interested in dental, vision, hearing, or OTC allowances bundled into one plan and one card, without shopping for separate coverage.

Are comfortable with a network Have doctors already in-network, are in generally good health, and want to keep monthly costs low while still having a cap on the worst case.

One thing worth knowing before you decide: switching from Medicare Advantage into a Medigap plan later isn't always guaranteed. Outside your initial enrollment window, insurers in most states can ask health questions and price or decline coverage accordingly. A handful of states have their own rules that make switching easier. It's worth knowing where your state stands before you choose, not after.

Not sure which one fits your situation?

This is exactly what a first call is for. No pressure, no quota, and I work with multiple carriers, so the plan I point you toward is based on your doctors and your budget, not a commission.

Schedule a Free Consultation Call (888) 996-4534