Medicare Advantage vs Original Medicare
Updated September 2026 · 2026 figures from CMS and Medicare.gov
Medicare Advantage (Part C) plans are sold by private insurers and replace Original Medicare. They often have low or $0 premiums, a yearly out-of-pocket cap and extras, but use provider networks and prior authorization. Original Medicare with a Medigap policy costs more each month but lets you see any doctor that accepts Medicare with few surprise bills.
Side-by-side comparison
| Medicare Advantage | Original Medicare + Medigap + Part D | |
|---|---|---|
| Doctors and hospitals | Plan network (HMO/PPO); out-of-network limited or costs more | Any US provider that accepts Medicare |
| Monthly premium | Part B premium + plan premium (often $0) | Part B premium + Medigap premium + Part D premium |
| Out-of-pocket limit | Yes, set by each plan within Medicare's limit | None in Original Medicare; Medigap fills most gaps |
| Costs when you use care | Copays and coinsurance up to the cap | Low or none, depending on the Medigap plan |
| Prior authorization / referrals | Common | Rare |
| Drug coverage | Usually included | Separate Part D plan |
| Dental, vision, hearing extras | Often some | Not covered |
| Travel within the US | Mostly emergency/urgent care outside the service area | Coverage anywhere in the US |
| Travel abroad | Varies by plan | Many Medigap plans pay 80% of foreign emergencies |
Who Medicare Advantage tends to suit
- People who want low monthly premiums and a known worst-case yearly cost
- People happy to use a local network and who don't travel much
- People who value the dental, vision or hearing extras
Who Original Medicare plus Medigap tends to suit
- People who want freedom to see any specialist or hospital, including major academic centers
- People who split the year between states or travel a lot
- People with health conditions who want predictable, low costs when they use care
The switching trap
You can move from Medicare Advantage back to Original Medicare during Open Enrollment or the Medicare Advantage Open Enrollment Period. But outside your one-time Medigap Open Enrollment Period, Medigap insurers in most states can use medical underwriting — and refuse you or charge more because of your health. There are limited guaranteed-issue rights (for example a "trial right" if you joined Medicare Advantage when first eligible and leave within 12 months). If you might want Medigap later, think carefully before choosing Medicare Advantage at 65.
When you can join or switch
| Enrollment period | Dates | What you can do |
|---|---|---|
| Initial Enrollment Period | 7 months: 3 months before your 65th-birthday month, that month, and 3 months after | Sign up for Parts A and B, and join a Part D or Medicare Advantage plan |
| General Enrollment Period | January 1 – March 31 | Sign up for Part A/B if you missed your window; coverage starts the next month; late penalties may apply |
| Special Enrollment Period | Up to 8 months after job-based coverage (or the job) ends | Sign up for Part B without a penalty |
| Annual Open Enrollment | October 15 – December 7 | Switch between Original Medicare and Medicare Advantage, or change drug plans; changes start January 1 |
| Medicare Advantage Open Enrollment | January 1 – March 31 | If you're in a Medicare Advantage plan: switch to another one, or go back to Original Medicare |
| Medigap Open Enrollment | 6 months from the month you're 65+ and have Part B | Buy any Medigap policy sold in your state with no medical questions |
Frequently asked questions
Is Medicare Advantage better than Original Medicare?
Neither is better for everyone. Medicare Advantage costs less per month and caps yearly costs but limits you to a network; Original Medicare with Medigap costs more per month but offers freedom of providers and low costs when you use care.
Can I switch from Medicare Advantage back to Original Medicare?
Yes, during Open Enrollment (Oct 15 – Dec 7) or the Medicare Advantage Open Enrollment Period (Jan 1 – Mar 31). Getting a Medigap policy at that point may require medical underwriting.
Do Medicare Advantage plans have an out-of-pocket maximum?
Yes. Every plan must cap yearly out-of-pocket costs for Part A and B services.
Is a $0 premium Medicare Advantage plan really free?
You still pay your Part B premium plus copays and coinsurance when you use care, up to the plan's yearly limit.