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Medicare Advantage Enrollment Tracker · Oklahoma

Medicare Advantage Enrollment in Oklahoma

Oklahoma had 353,617 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 3.4% from Sep 2025, faster than the national 2.0%. Oklahoma ranks 28th by members and holds 1.0% of the national total.

UnitedHealthcare leads with 41.6% of members who have a carrier label (contract file, September 2026). Among individual plans, which leave out employer group coverage, enrollment is up 3.9% in the 12 months to September 2026.

By Senior Deal Club Standards Desk · Data as of September 2026 · Editorial policy

Data as ofCMS public files, monthly snapshot

  • These totals include employer and union group plans.
    Why this matters

    The CMS contract and county files count group plans that retirees get through a former employer. They are not plans you can pick on your own. Counts here are larger than the individual-plan counts on county pages.

  • Some months are missing from the source.
    Why this matters

    CMS did not publish every month. Lines break at a missing month instead of guessing a value. A dotted line, where shown, only joins the two sides.

Oklahoma at a glance

Medicare Advantage members

353,617

Oklahoma members by month: from 284K in Jan 2023 to 354K in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 28.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.

12-month change

+3.4%

up 3.4 percent vs Sep 2025

County file · Sep 2026. National: +2.0%.

Share of national total

1.0%

County file · Sep 2026. Of jurisdictions that report every month.

Individual plan members

316,279

Individual MA · Sep 2026. Employer group plans left out.

Individual MA · Sep 2026
Individual Medicare Advantage plans (IND), from county data. Employer and union group plans are left out, so counts are smaller than in the other two files.

Largest carrier

UnitedHealthcare

41.6% of members with a carrier label. Contract file · Sep 2026.

Oklahoma members by month

Medicare Advantage members in Oklahoma

Members, by month.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.
Medicare Advantage members in OklahomaLine chart, January 2023 to September 2026. Oklahoma: 354K in September 2026. Shaded bands mark months with no data.280K300K320K340K360K2023202420252026Oklahoma354K
Medicare Advantage members in OklahomaLine chart, January 2023 to September 2026. Oklahoma: 354K in September 2026. Shaded bands mark months with no data.280K300K320K340K360K20232025Oklahoma354K
  • Oklahoma
  • Shaded: no data that month
View the data table
Medicare Advantage members in Oklahoma: values by month
MonthOklahoma
Sep 2026354K
Aug 2026354K
Jul 2026353K
Jun 2026353K
May 2026352K
Apr 2026352K
Mar 2026352K
Feb 2026351K
Jan 2026348K
Dec 2025343K
Nov 2025343K
Oct 2025342K
Sep 2025342K
Aug 2025341K
Jul 2025340K
Jun 2025340K
May 2025339K
Apr 2025338K
Mar 2025338K
Feb 2025337K
Jan 2025334K
Dec 2024329K
Nov 2024329K
Oct 2024328K
Sep 2024327K
Aug 2024326K
Jul 2024325K
Jun 2024324K
May 2024324K
Apr 2024323K
Mar 2024322K
Feb 2024321K
Jan 2024320K
Dec 2023–
Nov 2023306K
Oct 2023305K
Sep 2023303K
Aug 2023302K
Jul 2023–
Jun 2023299K
May 2023298K
Apr 2023296K
Mar 2023295K
Feb 2023292K
Jan 2023284K

County file · Sep 2026. Employer group plans included.

Oklahoma and the nation, Jan 2023 = 100

Each line is members divided by members in the start month, times 100.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.
Oklahoma and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Oklahoma: 124.6 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001101201302023202420252026Oklahoma124.6National117.8
Oklahoma and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Oklahoma: 124.6 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10011012013020232025Oklahoma124.6National117.8
  • Oklahoma
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
Oklahoma and the nation, Jan 2023 = 100: values by month
MonthOklahomaNational (same jurisdictions each month)
Sep 2026124.6117.8
Aug 2026124.5117.8
Jul 2026124.4117.5
Jun 2026124.3117.4
May 2026124.1117.2
Apr 2026123.9116.9
Mar 2026123.9116.7
Feb 2026123.7116.3
Jan 2026122.7114.7
Dec 2025120.8115.9
Nov 2025120.9115.9
Oct 2025120.7115.7
Sep 2025120.5115.5
Aug 2025120.3115.3
Jul 2025119.9115
Jun 2025119.7114.8
May 2025119.4114.4
Apr 2025119.2114.2
Mar 2025119113.8
Feb 2025118.7113.4
Jan 2025117.6111.9
Dec 2024115.8112
Nov 2024115.7112
Oct 2024115.5111.7
Sep 2024115.3111.5
Aug 2024114.9111.2
Jul 2024114.6110.9
Jun 2024114.3110.7
May 2024114.2110.5
Apr 2024113.7110
Mar 2024113.4109.7
Feb 2024113.2109.3
Jan 2024112.6108.7
Dec 2023––
Nov 2023107.7105.9
Oct 2023107.3105.6
Sep 2023106.8105.2
Aug 2023106.4104.9
Jul 2023––
Jun 2023105.4104.1
May 2023104.9103.8
Apr 2023104.4103.4
Mar 2023104103
Feb 2023103102.2
Jan 2023100100

County file · Sep 2026. National line sums the jurisdictions that report in every month.

Individual plans

Individual plans leave out employer and union group coverage, so counts are smaller than in the county file.

Carrier share in Oklahoma

Share of members whose contract has a carrier label, September 2026 against September 2025.

Contract file · Sep 2026
CMS contract file (SCC). All Medicare Advantage contracts, with employer and union group plans included. It still lists Connecticut and Alaska.

UnitedHealthcare leads with 41.6% of members who have a carrier label (contract file, September 2026).

UnitedHealthcare lost 11.8 points in 12 months; most of that change came in January 2026.

Humana gained 10.4 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 75.1%, down 1.4 points from Sep 2025.

The market is less concentrated than a year earlier (direction only; the level depends on how carriers are grouped).

Carrier share, Sep 2025 to Sep 2026

Percent of members with a carrier label. Largest carriers.

Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 53.3% to 41.6%; Humana: 23.1% to 33.6%; St Francis Health System & St John Health System: 10.5% to 10.8%; MHH Healthcare: 5.0% to 5.5%; Aetna/CVS: 4.9% to 4.3%; HCSC/BCBS: 2.3% to 2.6%.Sep 2025Sep 2026UnitedHealthcare 53.3%41.6% UnitedHealthcareHumana 23.1%33.6% HumanaSt Francis Health S… 10.5%10.8% St Francis Health S…MHH Healthcare 5.0%5.5% MHH HealthcareAetna/CVS 4.9%4.3% Aetna/CVSHCSC/BCBS 2.3%2.6% HCSC/BCBS
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 53.3% to 41.6%; Humana: 23.1% to 33.6%; St Francis Health System & St John Health System: 10.5% to 10.8%; MHH Healthcare: 5.0% to 5.5%; Aetna/CVS: 4.9% to 4.3%; HCSC/BCBS: 2.3% to 2.6%.Sep 2025Sep 2026UHC 53.3%41.6%Humana 23.1%33.6%St Francis Health System & St John Health System 10.5%10.8%MHH 5.0%5.5%Aetna 4.9%4.3%Blue Cross 2.3%2.6%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
UnitedHealthcare53.3%41.6%−11.8 pts
Humana23.1%33.6%+10.4 pts
St Francis Health System & St John Health System10.5%10.8%+0.3 pts
MHH Healthcare5.0%5.5%+0.6 pts
Aetna/CVS4.9%4.3%−0.5 pts
HCSC/BCBS2.3%2.6%+0.2 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, Oklahoma, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
UnitedHealthcare41.6%53.3%−11.8 pts145,895
Humana33.6%23.1%+10.4 pts117,824
St Francis Health System & St John Health System10.8%10.5%+0.3 pts37,834
MHH Healthcare5.5%5.0%+0.6 pts19,445
Aetna/CVS4.3%4.9%−0.5 pts15,245
HCSC/BCBS2.6%2.3%+0.2 pts8,985
Devoted Health0.8%––2,760
Centene/Wellcare0.7%0.7%0.0 pts2,315
Mitchell Family Office0.1%0.1%0.0 pts467
Elevance/Anthem0.1%0.0%0.0 pts239
BCBS Michigan0.0%0.0%0.0 pts64
All other carriers0.0%––12

Insurer not assigned in CMS data: 0.2% of all members in Sep 2026, 1.7% in Sep 2025. Shares leave these members out. Contract IDs are renumbered each January, so this page follows carriers, not contracts. A contract that serves several states carries one carrier label, so a carrier can appear in a state where it is not a local plan. See the carrier view for the whole nation.

Biggest counties in Oklahoma

Individual plan members and the 12-month change for each county, from county data.

Individual MA · Sep 2026
Individual Medicare Advantage plans (IND), from county data. Employer and union group plans are left out, so counts are smaller than in the other two files.
Biggest counties in Oklahoma by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
Tulsa61,424+3.7%UnitedHealthcare35.8%
Oklahoma59,883+3.5%UnitedHealthcare42.2%
Cleveland18,162+3.9%Humana42.2%
Canadian10,625+3.1%UnitedHealthcare43.4%
Creek9,254+3.9%St Francis Health System & St John Health System33.6%
Rogers9,243+4.8%UnitedHealthcare44.9%
Wagoner8,401+4.5%UnitedHealthcare37.8%
Comanche7,229+5.1%Humana77.9%
Pottawatomie6,934+2.9%Humana45.5%
Muskogee6,353+4.6%UnitedHealthcare53.2%

Browse all counties.

Common questions

How many people have Medicare Advantage in Oklahoma?

Oklahoma had 353,617 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 316,279 members in September 2026.

Is Medicare Advantage growing in Oklahoma?

Enrollment is up 3.4% from Sep 2025 to Sep 2026, faster than the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 3.9% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in Oklahoma?

UnitedHealthcare leads with 41.6% of members who have a carrier label (contract file, September 2026). UnitedHealthcare and Humana together hold 75.1%, down 1.4 points from Sep 2025. Shares leave out members whose contract has no carrier label: 0.2% of members.

Cite and download

Cite this page

Senior Deal Club Standards Desk. Medicare Advantage Enrollment in Oklahoma, data as of September 2026. Source: CMS public enrollment files. https://www.seniordealclub.com/medicare-advantage/enrollment/states/oklahoma

Download Oklahoma CSV

Data: CMS public enrollment files, in a monthly snapshot processed by TapQuality. Senior Deal Club is not affiliated with Medicare or any government agency.

These pages are educational. They are not plan advice. How the numbers are built · Editorial policy