The quick answer
Both are ways to handle the costs Original Medicare doesn't cover. Medicare Advantage is an all-in-one plan that usually has a network and lower premiums. A Medicare Supplement works with Original Medicare, lets you see any provider that accepts Medicare, and usually has a higher premium but more predictable costs.
Side-by-side
| Topic | Medicare Advantage | Medicare Supplement |
|---|---|---|
| Doctors | Usually a network (HMO or PPO) | Any provider in the U.S. that accepts Medicare |
| Monthly premium | Varies; some plans have no plan premium (Part B premium still applies) | Monthly premium, plus Part B premium |
| Costs when you get care | Copays and coinsurance, up to a yearly out-of-pocket maximum | Low or predictable, depending on the plan letter |
| Drug coverage | Usually included | Needs a separate Part D plan |
| Referrals & approvals | May need referrals or prior authorization | No referrals under Original Medicare |
| Extra benefits | Some plans include certain dental, vision, or hearing benefits | Generally not included |
| Switching later | During set enrollment periods | May require health questions outside open enrollment |
Questions Arizona residents often weigh
- Do you spend part of the year somewhere else? Winter and summer travel can affect which option fits better.
- Are your doctors in a particular health system? Check networks carefully.
- Would you rather pay more each month for predictability, or less each month and pay as you go?
Choose carefully the first time
If you start with Medicare Advantage and later want a Medigap policy, you might have to answer health questions and could be declined, except in certain guaranteed-issue situations. That's why many people take time to think this through when they first enroll.
This page is general educational information, not personal advice. Medicare rules, costs, and plan options change and depend on your situation. For official information, visit Medicare.gov or call 1-800-MEDICARE (1-800-633-4227; TTY 1-877-486-2048).