Side by side
| Feature | Original Medicare | Medicare Advantage |
|---|---|---|
| Doctors and hospitals | Any provider in the U.S. that accepts Medicare | Usually the plan's network; out-of-network care may cost more or not be covered |
| Specialist referrals | Usually not needed | May be needed |
| Prior approval | Usually not needed | May be needed for some services |
| Yearly out-of-pocket limit | None (a Medigap policy can fill most gaps) | Yes; for 2027, in-network limits can't exceed $9,850 |
| Drug coverage | Join a separate Part D plan | Included in most plans |
| Extra benefits | Not routine dental, vision or hearing | May be offered (see below) |
| Where it's available in Oklahoma | All 77 counties | Depends on your county; none open to everyone in seven counties for 2027 |
Medicare Advantage plans may offer extra benefits Original Medicare doesn't cover, such as dental, vision, hearing or fitness. Extra benefits vary by plan and county, may have limits and costs, and not every plan offers them. Check a plan's Summary of Benefits or Evidence of Coverage.
What's different in Oklahoma
- Choices vary widely by county. CMS lists 50 Medicare Advantage plans open to everyone in Oklahoma for 2027, with 35 in Oklahoma County and 32 in Tulsa County, but none in Beaver, Cimarron, Ellis, Harmon, Harper, Roger Mills or Texas counties. See is Medicare Advantage available in every Oklahoma county.
- Oklahoma's Medigap birthday rule. Since September 1, 2023, Oklahoma lets people who already have a Medigap policy switch each year, within 60 days starting on their birthday, to a policy with equal or lesser benefits without health questions (OAC 365:10-5-129(f)). It doesn't apply to people in Medicare Advantage. See the birthday rule.
- Buying Medigap later can be harder. If you start with Medicare Advantage and later want Medigap, the company can usually ask health questions unless you have a guaranteed-issue right. See switching from Medicare Advantage to Medigap.
How to choose
- List your doctors, hospitals and medicines. Include any out-of-state doctors.
- Check what's offered in your county. Use Medicare Plan Finder or see plans for your ZIP code.
- Compare total yearly costs. Include premiums, deductibles, copays and the Part D out-of-pocket cap of $2,400 for 2027.
- Think ahead. Consider travel, future health needs and whether you'd want Medigap later.
To compare Medicare Advantage plans and Medigap policies from the companies they work with, you can request a call from a licensed insurance agent. Our Medigap vs. Medicare Advantage comparison and Medicare Advantage in Oklahoma guide go deeper.
Related questions
How do I compare plans?
A checklist for Oklahoma.
Can I use my plan outside Oklahoma?
Travel and out-of-area care.
How many plans are in Oklahoma for 2027?
CMS counts by county.
Sources
- Medicare.gov — Compare Original Medicare and Medicare Advantage
- Medicare.gov — When can I buy a Medigap policy?
- CMS — Medicare Advantage and Part D contract and enrollment data (CY2027 Landscape file)
- Oklahoma Insurance Department — Bulletin No. 10-2023 (Revised), new Medicare supplement enrollment requirements
- Oklahoma Insurance Department — New Medicare Supplement Open Enrollment FAQs
More questions in this guide
- Can I use my Medicare Advantage plan outside Oklahoma?
- How do I compare Medicare Advantage plans in Oklahoma?
- How many Medicare Advantage plans are available in Oklahoma for 2027?
- Is Medicare Advantage available in every Oklahoma county?
Part of the guide: Medicare Advantage in Oklahoma · All questions
Frequently asked questions
Do I still pay the Part B premium with Medicare Advantage?
Yes. You keep paying your Part B premium to Medicare when you join a Medicare Advantage plan, plus any premium the plan charges. The 2027 Part B premium had not been announced by CMS as of November 11, 2026.
Can I have Medigap and Medicare Advantage at the same time?
No. Medigap only works with Original Medicare, and it's illegal for anyone to sell you a Medigap policy while you're in a Medicare Advantage plan unless you're switching back to Original Medicare.
Which is better in Oklahoma?
Neither is right for everyone. People who travel or want any doctor often prefer Original Medicare with Medigap. People who want one plan with drug coverage and a set yearly limit may prefer Medicare Advantage, if a plan in their county includes their doctors.
Can I change my mind later?
You can switch between them during open enrollment, October 15 to December 7, and Medicare Advantage members can make one change from January 1 to March 31. Buying Medigap later may require health questions in Oklahoma, so think about that before you leave Original Medicare.
Medicare in your Oklahoma county
Plans, local agents and help, county by county: Oklahoma · Tulsa · Cleveland · Canadian · Comanche · Rogers · Wagoner · Payne · Pottawatomie · Creek · Muskogee · Garfield · Grady · Washington · Logan · Bryan · Le Flore · Carter · Cherokee · McClain · All 77 counties →
