When you become eligible for Medicare, one of the biggest decisions is how you want to receive your coverage. The two main paths are a Medicare Advantage plan or Original Medicare paired with a Medicare Supplement (Medigap) policy. They work very differently, and you generally pick one path, not both.
Two Different Approaches
Medicare Advantage (Part C) is an all-in-one private plan that takes the place of Original Medicare. It usually has a network of doctors, often includes prescription drugs plus extras like dental and vision, and caps your yearly out-of-pocket spending.
Medicare Supplement (Medigap) is not a replacement; it sits on top of Original Medicare and pays the deductibles, copays, and coinsurance Medicare leaves to you. With Original Medicare plus Medigap, you can see any provider in the country that accepts Medicare, with no network.
Medicare Advantage: Pros and Cons
Pros: often low or $0 monthly premium; bundles drug, dental, vision, and other extra benefits; includes a yearly out-of-pocket maximum; one card, one plan.
Cons: you generally must use the plan network; you may need referrals; you pay copays and coinsurance as you go; benefits and networks can change each year.
Medicare Supplement: Pros and Cons
Pros: see any provider nationwide that accepts Medicare, with no network or referrals; very predictable, low out-of-pocket costs; coverage does not change year to year the way plan benefits can.
Cons: higher monthly premium; does not include drug coverage (you add a separate Part D plan) or dental and vision; outside your initial enrollment window you may face medical underwriting to buy or switch.
Compare Both Paths for Your Situation
The better choice depends on your doctors, budget, and how you use care. Answer 6 quick questions and a licensed advisor can compare Medicare Advantage and Medigap options available where you live, at no cost.
Check My EligibilitySide-by-Side
| Feature | Medicare Advantage | Medicare Supplement (Medigap) |
|---|---|---|
| Works with | Replaces Original Medicare | Adds to Original Medicare |
| Doctor choice | Network (HMO/PPO) | Any provider that accepts Medicare |
| Referrals | Often required | Not required |
| Monthly premium | Often low or $0 | Higher |
| Costs when using care | Copays/coinsurance up to a max | Very low after premium |
| Drug coverage | Usually included | Separate Part D plan |
| Extra benefits (dental/vision) | Often included | Not included |
How to Choose
A simple way to frame it: choose Medicare Advantage if you want low upfront cost, bundled extra benefits, and you are comfortable using a network. Choose Original Medicare plus Medigap if you want maximum freedom to see any doctor, the most predictable out-of-pocket costs, and you do not mind a higher premium for that peace of mind. Our companion guides on Plan G and HMO vs PPO can help you go deeper on either path.
Can You Switch?
Yes, but the rules differ. You can move between Medicare Advantage plans, or back to Original Medicare, during set periods each year. Moving to a Medigap plan can require medical underwriting outside guaranteed-issue situations, so it is not automatic. Because timing and health questions matter, it helps to talk it through with a licensed advisor before you switch.