Your windows after December 7
| Window | Who can use it | When |
|---|---|---|
| Medicare Advantage Open Enrollment Period | Anyone in a Medicare Advantage plan | January 1 to March 31, one change |
| Plan not renewing | Members of a plan that's ending or leaving their county | December 8 to the last day of February |
| Moving | People who move out of their plan's area, or to an area with new choices | The month you move plus two full months after |
| SoonerCare or Extra Help | People with Medicaid or Extra Help | Certain changes once a calendar month |
| 5-star plan | Anyone in an area with a 5-star plan | Once, December 8 to November 30 |
| Losing other coverage | For example, losing employer or union coverage | Usually two months after it ends |
These come from federal rules (42 CFR 422.62), so they're the same in Oklahoma as elsewhere. Medicare.gov lists more Special Enrollment Periods, including for people who move into or out of a nursing home.
Oklahoma situations
- Moving within Oklahoma. Plans serve specific counties. If you move from Tulsa County to Cimarron County, for example, your plan may not serve your new county, and for 2027 no Medicare Advantage plan open to everyone is offered there. Your moving window lets you choose new coverage.
- SoonerCare. If you have both Medicare and SoonerCare, see SoonerCare and Medicare for your monthly options and special needs plans.
- After a disaster. When a tornado or ice storm leads to a federal emergency declaration, people affected may get a Special Enrollment Period. See tornadoes, ice storms and Medicare.
How to make a change
- Confirm your window. Check the table above or call 1-800-MEDICARE.
- Compare plans in your county. See plans for your ZIP code.
- Enroll in the new plan. Joining a new Medicare Advantage plan ends your old one automatically.
To compare plans from the companies they work with, you can request a call from a licensed insurance agent. See Medicare open enrollment in Oklahoma.
Related questions
When is open enrollment for 2027?
All the 2027 dates.
Can I go back to Original Medicare?
Medigap and Part D first.
My plan is ending in 2027
Deadlines and steps.
Sources
- Medicare.gov — Special Enrollment Periods
- Medicare.gov — Understanding Medicare Advantage and Medicare Drug Plan Enrollment Periods
- eCFR — 42 CFR 422.62, Election of coverage under an MA plan
- CMS — CY2027 Landscape file
More questions in this guide
- Can I go back to Original Medicare from Medicare Advantage?
- My Medicare Advantage plan is ending in 2027 in Oklahoma. What do I do?
- When is Medicare open enrollment in Oklahoma for 2027?
- Which Medicare companies are leaving Oklahoma in 2027?
Part of the guide: Medicare Open Enrollment in Oklahoma (2027 Plans) · All questions
Frequently asked questions
Can I use the January to March window if I have Original Medicare?
No. The Medicare Advantage Open Enrollment Period is only for people already in a Medicare Advantage plan. People in Original Medicare can't use it to join a Medicare Advantage plan or switch Part D plans.
When does a change made in this window start?
On the first day of the month after the plan gets your request. A change made in February, for example, starts March 1.
What is the 5-star Special Enrollment Period?
If a Medicare Advantage plan with a 5-star overall rating serves your area, you can switch to it once between December 8 and November 30 of the following year. Medicare Plan Finder shows each plan's rating.
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 →
