TRYNYTYhealth:enablement
MA Enrollment Explorer / States / Oklahoma

Medicare Advantage in Oklahoma: enrollment, penetration and market share

354,567 people in Oklahoma were enrolled in Medicare Advantage in October 2026. 42.5% of the state's 835,109 eligible Medicare beneficiaries are in Medicare Advantage, +0.6 pts since October 2025. UnitedHealth Group, Inc. is the largest parent organization with 41% of reported enrollment; 16 parent organizations have 11 or more members, and the market's HHI is 3,009 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Oklahoma changed by +8,013 (+2.3%).

42.5%MA penetration, October 2026
355KMA enrollees
16parent organizations (11+ members)
3,009HHI, highly concentrated
Open Oklahoma on the market mapMSSP ACOs in Oklahoma

Parent organizations in Oklahoma

Parent organizationMembersChangeShareShare change
UnitedHealth Group, Inc.145,451−33,40741.3%−11.2 pts
Humana Inc.118,423+40,93533.6%+10.9 pts
St Francis Health System & St John Health System37,859+2,77010.7%+0.5 pts
MHH Healthcare, L.P.19,540+2,7775.5%+0.6 pts
CVS Health Corporation15,294−1,0434.3%−0.5 pts
Health Care Service Corporation9,062−2,0002.6%−0.7 pts
Devoted Health, Inc.2,759new0.8%+0.8 pts
Centene Corporation2,284−1,7340.6%−0.5 pts
Mitchell Family Office492+2000.1%+0.1 pts
Valir PACE, LLC.285+33under 0.1%+0.01 pts
LIFE Senior Services, Inc.277+30under 0.1%+0.01 pts
Elevance Health, Inc.226+71under 0.1%+0.02 pts
Cherokee Nation Comprehensive Care Agency164+5under 0.1%−0.00 pts
Blue Cross Blue Shield of Michigan Mutual Ins. Co.66−2under 0.1%−0.00 pts
California Physicians' Service14newunder 0.1%+0.00 pts
Highmark Health12newunder 0.1%+0.00 pts

Change and share change are since October 2025. Shares are of reported enrollment in the CMS State/County/Contract file.

Counties

CountyMA enrolleesPenetrationLeading parent
Oklahoma County67,54545.8%UnitedHealth Group, Inc. 43%
Tulsa County67,45653.3%UnitedHealth Group, Inc. 35%
Cleveland County22,29140.8%UnitedHealth Group, Inc. 42%
Canadian County12,44042.1%UnitedHealth Group, Inc. 46%
Rogers County10,41547.0%UnitedHealth Group, Inc. 43%
Creek County9,92857.1%St Francis Health System & St John Health System 33%
Wagoner County9,39651.7%UnitedHealth Group, Inc. 38%
Comanche County7,77735.2%Humana Inc. 75%
Pottawatomie County7,72846.0%Humana Inc. 42%
Muskogee County6,74341.6%UnitedHealth Group, Inc. 54%
Delaware County5,53647.0%UnitedHealth Group, Inc. 50%
Le Flore County5,18343.7%Humana Inc. 54%
Washington County4,99538.6%UnitedHealth Group, Inc. 50%
Osage County4,89944.0%UnitedHealth Group, Inc. 36%
Sequoyah County4,89246.6%Humana Inc. 53%
Okmulgee County4,81749.5%UnitedHealth Group, Inc. 40%
Mayes County4,76849.2%UnitedHealth Group, Inc. 45%
Grady County4,58137.7%Humana Inc. 51%
Logan County4,35741.2%UnitedHealth Group, Inc. 40%
Carter County4,21636.2%UnitedHealth Group, Inc. 46%
Cherokee County4,04738.2%UnitedHealth Group, Inc. 52%
McClain County4,04041.0%Humana Inc. 46%
Pittsburg County4,00338.0%Humana Inc. 40%
Ottawa County3,88847.2%UnitedHealth Group, Inc. 48%
Kay County3,88336.4%UnitedHealth Group, Inc. 55%
Bryan County3,84036.6%Humana Inc. 49%
Garfield County3,77429.1%Humana Inc. 40%
Lincoln County3,74143.4%Humana Inc. 41%
Stephens County3,05826.7%Humana Inc. 49%
Payne County2,94921.2%Humana Inc. 88%
Seminole County2,70248.5%Humana Inc. 44%
Pontotoc County2,69831.3%Humana Inc. 46%
Garvin County2,69041.5%Humana Inc. 45%
McIntosh County2,61341.9%UnitedHealth Group, Inc. 42%
Caddo County2,22335.1%Humana Inc. 43%
McCurtain County2,18829.8%UnitedHealth Group, Inc. 62%
Adair County2,16345.4%UnitedHealth Group, Inc. 49%
Pawnee County1,78940.9%UnitedHealth Group, Inc. 40%
Marshall County1,67037.8%UnitedHealth Group, Inc. 73%
Craig County1,66141.4%UnitedHealth Group, Inc. 53%
Choctaw County1,43737.2%UnitedHealth Group, Inc. 56%
Custer County1,38626.1%UnitedHealth Group, Inc. 76%
Okfuskee County1,23345.0%UnitedHealth Group, Inc. 40%
Hughes County1,22637.7%Humana Inc. 46%
Jackson County1,22225.7%UnitedHealth Group, Inc. 56%
Haskell County1,19336.5%UnitedHealth Group, Inc. 57%
Pushmataha County1,14934.7%UnitedHealth Group, Inc. 48%
Nowata County1,08041.5%UnitedHealth Group, Inc. 50%
Atoka County1,03131.5%UnitedHealth Group, Inc. 70%
Johnston County99138.1%Humana Inc. 48%
Beckham County98322.0%UnitedHealth Group, Inc. 98%
Kingfisher County97927.7%Humana Inc. 53%
Latimer County91736.0%UnitedHealth Group, Inc. 54%
Woodward County88822.1%Humana Inc. 67%
Murray County88625.7%UnitedHealth Group, Inc. 46%
Love County82433.3%UnitedHealth Group, Inc. 59%
Kiowa County78034.4%Humana Inc. 49%
Washita County68327.2%UnitedHealth Group, Inc. 95%
Noble County66124.0%UnitedHealth Group, Inc. 45%
Blaine County60528.8%UnitedHealth Group, Inc. 46%
Tillman County60235.7%UnitedHealth Group, Inc. 76%
Texas County50018.1%UnitedHealth Group, Inc. 91%
Coal County45937.6%UnitedHealth Group, Inc. 61%
Jefferson County44130.4%UnitedHealth Group, Inc. 60%
Cotton County37726.8%UnitedHealth Group, Inc. 54%
Greer County33927.1%UnitedHealth Group, Inc. 79%
Woods County32618.2%UnitedHealth Group, Inc. 76%
Major County31717.5%UnitedHealth Group, Inc. 51%
Alfalfa County24120.2%UnitedHealth Group, Inc. 75%
Grant County23422.5%UnitedHealth Group, Inc. 56%
Dewey County20919.3%Humana Inc. 56%
Harmon County16628.3%UnitedHealth Group, Inc. 100%
Beaver County16115.6%UnitedHealth Group, Inc. 90%
Ellis County14014.9%UnitedHealth Group, Inc. 86%
Roger Mills County12916.2%UnitedHealth Group, Inc. 100%
Cimarron County10318.5%UnitedHealth Group, Inc. 83%
Harper County869.8%UnitedHealth Group, Inc. 84%