What CMS tells tribal elders
CMS wrote its guide for tribal Medicare beneficiaries because, in its words, Indian health care providers may not be part of a Medicare Advantage plan's network. Its comparison:
| Question | Original Medicare | Medicare Advantage |
|---|---|---|
| Can I keep my IHS or tribal clinic? | Yes; the clinic is paid for Medicare-covered services | Yes, but if the clinic is out of network it may not be paid |
| Other doctors and hospitals | Any provider in the U.S. that takes Medicare | Usually the plan's network; some plans cover out-of-network care |
| Approvals | Usually no prior approval | May need plan approval for some services |
| Yearly limit on costs | None, unless you have other coverage | Yes, for Part A and B services |
Medicare Advantage plans must cover everything Original Medicare covers. They 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.
Medicare Advantage in Oklahoma
CMS data list 50 Medicare Advantage plans open to everyone in Oklahoma for 2027, from 9 companies, but not every county has one. Networks differ by plan and county, and a plan that contracts with one tribal health system may not contract with another. See Medicare Advantage in Oklahoma and plans ending in 2027.
Before you join a plan
- Ask your clinic's benefits office. CMS advises contacting your Indian health care provider before you enroll to make sure a plan works with it.
- Ask your pharmacy. Find out which drug plans it has contracts with.
- Check outside providers. Make sure the specialists and hospitals you're referred to are in the network.
- Compare against Original Medicare. Think about Purchased/Referred Care, travel and any Medigap policy you'd give up.
Read our guide to tribal health and Medicare in Oklahoma. To compare plans from the companies they work with, including which ones contract with your clinic, you can request a call from a licensed insurance agent.
Related questions
Using Medicare at a tribal clinic
How billing works.
Help paying Medicare premiums
Savings programs and sponsorship.
Do I need Medicare with IHS?
Why most tribal citizens sign up.
Sources
- CMS — Medicare and Tribal Medicare Beneficiaries: A Guide to Original Medicare and Medicare Advantage
- CMS — Important Facts about Medicare for American Indians and Alaska Natives
- 42 CFR §423.120(a)(6) — Access to I/T/U pharmacies
- CMS — CY2027 Medicare Advantage and Part D Landscape files
More questions in this guide
- Can I use Medicare at a tribal clinic or IHS hospital in Oklahoma?
- Can Native Americans get help paying Medicare premiums in Oklahoma?
- Do Native Americans in Oklahoma need Medicare if they have IHS?
- Will I pay a Part B late penalty if I only use IHS or tribal health care?
Part of the guide: Tribal Health Care, IHS and Medicare in Oklahoma · All questions
Frequently asked questions
Can a Medicare Advantage plan stop me from using my tribal clinic?
No. Your eligibility for IHS or tribal care doesn't depend on your Medicare choice, so the clinic can still see you. The difference is whether the plan pays the clinic, which affects the resources your clinic has for your community.
If I join a Medicare Advantage plan, can I go back to Original Medicare?
Yes. You can switch during Open Enrollment, October 15 to December 7, 2026, for coverage starting January 1, 2027, or during the Medicare Advantage Open Enrollment Period, January 1 to March 31, 2027. CMS notes you may not be able to get back a Medigap policy you dropped.
Do Medicare Advantage drug plans work with IHS pharmacies?
Federal rules require every Part D plan, including Medicare Advantage plans with drug coverage, to offer standard contract terms to all IHS, tribal and urban Indian pharmacies in its area. Ask your pharmacy which plans it has signed with.
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 →
