Free tool · public CMS data
Oklahoma Medicare Advantage market share
In September 2026, 345,304 Oklahoma Medicare beneficiaries were enrolled in a Medicare Advantage plan across 81 parent carriers and 77 counties, led by UnitedHealth Group, Inc. with 41.7% of counted enrollment.
Data month
September 2026
Advantage enrollees
345,304
+3.2% vs September 2025
Parent carriers
81
Advantage penetration
40.4%
CMS Medicare Monthly Enrollment, 2024
Carriers in Oklahoma
CMS Monthly Enrollment by Contract/Plan/State/County (CPSC) · September 2026
| # | Parent organisation | Enrollees | Share | Counties | vs September 2025 |
|---|---|---|---|---|---|
| 1 | UnitedHealth Group, Inc. | 144,063 | 41.7% | 77 | -18.6% |
| 2 | Humana Inc. | 116,576 | 33.8% | 77 | +52.1% |
| 3 | St Francis Health System & St John Health System | 37,628 | 10.9% | 45 | +7.6% |
| 4 | MHH Healthcare, L.P. | 19,144 | 5.5% | 43 | +17.4% |
| 5 | CVS Health Corporation | 14,445 | 4.2% | 77 | -7.7% |
| 6 | Health Care Service Corporation | 8,085 | 2.3% | 77 | -20.0% |
| 7 | Devoted Health, Inc. | 2,608 | 0.8% | 19 | — |
| 8 | Centene Corporation | 2,058 | 0.6% | 40 | -39.5% |
| 9 | Mitchell Family Office | 467 | 0.1% | 30 | +49.7% |
| 10 | Elevance Health, Inc. | 159 | 0.0% | 77 | +31.4% |
| 11 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 57 | 0.0% | 77 | -3.4% |
| 12 | California Physicians' Service | 14 | 0.0% | 77 | — |
| 13 | Alignment Healthcare USA, LLC | 0 | 0.0% | 77 | — |
| 14 | Allina Health and Aetna Insurance Holding Company | 0 | 0.0% | 77 | — |
| 15 | Astiva Health Holdings Incorporated | 0 | 0.0% | 1 | — |
| 16 | ATRIO Health Plans | 0 | 0.0% | 1 | — |
| 17 | Aultman Health Foundation | 0 | 0.0% | 77 | — |
| 18 | Aware Integrated, Inc. | 0 | 0.0% | 77 | — |
| 19 | Baylor Scott & White Health | 0 | 0.0% | 3 | — |
| 20 | Baystate Health, Inc. | 0 | 0.0% | 77 | — |
| 21 | Blue Cross & Blue Shield of Rhode Island | 0 | 0.0% | 77 | — |
| 22 | Blue Cross and Blue Shield of Massachusetts, Inc. | 0 | 0.0% | 77 | — |
| 23 | Blue Cross Blue Shield of Arizona | 0 | 0.0% | 2 | — |
| 24 | Blue Cross Blue Shield of Kansas | 0 | 0.0% | 77 | — |
| 25 | Blue Cross Blue Shield of Nebraska | 0 | 0.0% | 77 | — |
| 26 | BlueCross BlueShield of Alabama | 0 | 0.0% | 77 | — |
| 27 | BlueCross BlueShield of South Carolina (BCBSSC) | 0 | 0.0% | 77 | — |
| 28 | BlueCross BlueShield of Tennessee | 0 | 0.0% | 77 | — |
| 29 | Cambia Health Solutions, Inc. | 0 | 0.0% | 77 | — |
| 30 | CAPITAL BLUE CROSS | 0 | 0.0% | 77 | — |
| 31 | CareFirst, Inc. | 0 | 0.0% | 77 | — |
| 32 | CareSource | 0 | 0.0% | 3 | — |
| 33 | CHRISTUS Health | 0 | 0.0% | 1 | — |
| 34 | Clover Health Holdings, Inc. | 0 | 0.0% | 2 | — |
| 35 | Community Health Group | 0 | 0.0% | 1 | — |
| 36 | Corewell Health | 0 | 0.0% | 77 | — |
| 37 | CuraCor Solutions Corp. | 0 | 0.0% | 77 | — |
| 38 | EmblemHealth, Inc. | 0 | 0.0% | 77 | — |
| 39 | Fallon Community Health Plan, Inc. | 0 | 0.0% | 77 | — |
| 40 | Fenyx Health Holdings, Inc. | 0 | 0.0% | 77 | — |
| 41 | General Catalyst Group Management Holdings LP | 0 | 0.0% | 77 | — |
| 42 | Guidewell Mutual Holding Corporation | 0 | 0.0% | 77 | — |
| 43 | Hawaii Medical Service Association | 0 | 0.0% | 77 | — |
| 44 | Health Plan of San Mateo | 0 | 0.0% | 1 | — |
| 45 | Healthfirst, Inc. | 0 | 0.0% | 77 | — |
| 46 | HealthPartners, Inc. | 0 | 0.0% | 77 | — |
| 47 | Henry Ford Health System | 0 | 0.0% | 77 | — |
| 48 | Highmark Health | 0 | 0.0% | 77 | — |
| 49 | Horizon Mutual Holdings, Inc | 0 | 0.0% | 77 | — |
| 50 | Imperial Health Plan of California | 0 | 0.0% | 6 | — |
| 51 | Independence Health Group, Inc. | 0 | 0.0% | 77 | — |
| 52 | Independent Health Association, Inc. | 0 | 0.0% | 77 | — |
| 53 | INLAND EMPIRE HEALTH PLAN | 0 | 0.0% | 2 | — |
| 54 | Intermountain Health Care, Inc. | 0 | 0.0% | 1 | — |
| 55 | Kaiser Foundation Health Plan, Inc. | 0 | 0.0% | 16 | — |
| 56 | Lifetime Healthcare, Inc. | 0 | 0.0% | 77 | — |
| 57 | Local Initiative Health Authority for LA County | 0 | 0.0% | 1 | — |
| 58 | Longevity Health Founders, LLC | 0 | 0.0% | 1 | — |
| 59 | Louisiana Health Service & Indemnity Company | 0 | 0.0% | 77 | — |
| 60 | Lumeris Group Holdings Corporation | 0 | 0.0% | 1 | — |
| 61 | Martin's Point Health Care, Inc. | 0 | 0.0% | 77 | — |
| 62 | Medica Holding Company | 0 | 0.0% | 69 | — |
| 63 | MEDICAL MUTUAL OF OHIO | 0 | 0.0% | 77 | — |
| 64 | Memorial Hermann Health System | 0 | 0.0% | 1 | — |
| 65 | Molina Healthcare, Inc. | 0 | 0.0% | 8 | — |
| 66 | MVP Health Care, Inc. | 0 | 0.0% | 77 | — |
| 67 | Network Health, Inc. | 0 | 0.0% | 77 | — |
| 68 | Presbyterian Healthcare Services | 0 | 0.0% | 2 | — |
| 69 | Sanford Health | 0 | 0.0% | 1 | — |
| 70 | SANTA CLARA COUNTY HEALTH AUTHORITY | 0 | 0.0% | 1 | — |
| 71 | SCAN Group | 0 | 0.0% | 8 | — |
| 72 | Select Founders, LLC | 0 | 0.0% | 1 | — |
| 73 | The Health Plan of West Virginia, Inc. | 0 | 0.0% | 77 | — |
| 74 | Trinity Health Corporation | 0 | 0.0% | 1 | — |
| 75 | Triton Health Systems, L.L.C. | 0 | 0.0% | 1 | — |
| 76 | Ultimate Healthcare Holdings, LLC | 0 | 0.0% | 1 | — |
| 77 | UNICO Services, Inc. | 0 | 0.0% | 1 | — |
| 78 | Universal Health Services, Inc. | 0 | 0.0% | 7 | — |
| 79 | UPMC Health System | 0 | 0.0% | 77 | — |
| 80 | USAble Mutual Insurance Company | 0 | 0.0% | 77 | — |
| 81 | Visiting Nurse Service of New York | 0 | 0.0% | 1 | — |
County view
Leading carrier and Advantage enrollment in each Oklahoma county. Penetration is from CMS Medicare Monthly Enrollment, 2024.
| County | Advantage enrollees | Leading carrier | Leader share | Carriers | Penetration |
|---|---|---|---|---|---|
| Oklahoma | 66,920 | UnitedHealth Group, Inc. | 43.7% | 67 | 43.9% |
| Tulsa | 66,882 | UnitedHealth Group, Inc. | 35.6% | 61 | 50.2% |
| Cleveland | 22,070 | UnitedHealth Group, Inc. | 42.6% | 54 | 39.3% |
| Canadian | 12,208 | UnitedHealth Group, Inc. | 46.4% | 54 | 41.4% |
| Rogers | 10,272 | UnitedHealth Group, Inc. | 43.1% | 51 | 47.2% |
| Creek | 9,748 | St Francis Health System & St John Health System | 33.4% | 52 | 54.4% |
| Wagoner | 9,245 | UnitedHealth Group, Inc. | 37.8% | 54 | 49.6% |
| Comanche | 7,584 | Humana Inc. | 75.4% | 52 | 30.4% |
| Pottawatomie | 7,519 | UnitedHealth Group, Inc. | 42.4% | 52 | 43.6% |
| Muskogee | 6,558 | UnitedHealth Group, Inc. | 54.4% | 52 | 38.1% |
| Delaware | 5,400 | UnitedHealth Group, Inc. | 50.8% | 50 | 42.6% |
| Le Flore | 5,053 | Humana Inc. | 54.4% | 52 | 40.6% |
| Washington | 4,824 | UnitedHealth Group, Inc. | 49.6% | 51 | 34.4% |
| Osage | 4,776 | UnitedHealth Group, Inc. | 37.6% | 52 | 45.7% |
| Sequoyah | 4,776 | Humana Inc. | 53.2% | 52 | 43.8% |
| Okmulgee | 4,673 | UnitedHealth Group, Inc. | 41.1% | 55 | 47.5% |
| Mayes | 4,646 | UnitedHealth Group, Inc. | 45.5% | 53 | 45.5% |
| Grady | 4,430 | Humana Inc. | 51.3% | 51 | 36.6% |
| Logan | 4,193 | UnitedHealth Group, Inc. | 40.8% | 52 | 40.9% |
| Carter | 4,089 | UnitedHealth Group, Inc. | 45.9% | 54 | 34.0% |
| McClain | 3,868 | Humana Inc. | 46.1% | 51 | 36.8% |
| Pittsburg | 3,843 | Humana Inc. | 40.9% | 50 | 34.4% |
| Cherokee | 3,795 | UnitedHealth Group, Inc. | 54.9% | 53 | 35.4% |
| Kay | 3,775 | UnitedHealth Group, Inc. | 55.6% | 51 | 35.4% |
| Ottawa | 3,757 | UnitedHealth Group, Inc. | 48.8% | 50 | 44.4% |
| Bryan | 3,737 | Humana Inc. | 48.8% | 53 | 33.6% |
| Garfield | 3,631 | Humana Inc. | 40.1% | 51 | 27.5% |
| Lincoln | 3,570 | Humana Inc. | 41.4% | 52 | 42.9% |
| Stephens | 2,964 | Humana Inc. | 49.4% | 51 | 24.2% |
| Payne | 2,801 | Humana Inc. | 89.6% | 52 | 23.6% |
| Seminole | 2,586 | Humana Inc. | 45.1% | 52 | 44.9% |
| Pontotoc | 2,570 | Humana Inc. | 47.4% | 50 | 28.8% |
| Garvin | 2,566 | Humana Inc. | 44.7% | 52 | 38.6% |
| McIntosh | 2,472 | UnitedHealth Group, Inc. | 42.1% | 50 | 39.1% |
| McCurtain | 2,114 | UnitedHealth Group, Inc. | 62.7% | 49 | 29.1% |
| Caddo | 2,097 | Humana Inc. | 44.4% | 49 | 33.1% |
| Adair | 2,048 | UnitedHealth Group, Inc. | 50.1% | 49 | 42.2% |
| Pawnee | 1,656 | UnitedHealth Group, Inc. | 42.2% | 50 | 40.6% |
| Marshall | 1,571 | UnitedHealth Group, Inc. | 76.0% | 50 | 35.1% |
| Craig | 1,540 | UnitedHealth Group, Inc. | 54.9% | 50 | 37.8% |
| Choctaw | 1,362 | UnitedHealth Group, Inc. | 57.1% | 49 | 34.3% |
| Custer | 1,334 | UnitedHealth Group, Inc. | 77.5% | 49 | 25.7% |
| Jackson | 1,176 | UnitedHealth Group, Inc. | 57.2% | 48 | 23.0% |
| Hughes | 1,138 | Humana Inc. | 47.1% | 49 | 36.3% |
| Haskell | 1,111 | UnitedHealth Group, Inc. | 60.1% | 49 | 34.0% |
| Okfuskee | 1,095 | UnitedHealth Group, Inc. | 41.9% | 51 | 40.1% |
| Pushmataha | 1,076 | UnitedHealth Group, Inc. | 50.7% | 50 | 33.5% |
| Nowata | 1,002 | UnitedHealth Group, Inc. | 52.5% | 49 | 40.4% |
| Atoka | 970 | UnitedHealth Group, Inc. | 72.5% | 47 | 30.2% |
| Beckham | 951 | UnitedHealth Group, Inc. | 97.8% | 48 | 22.5% |
| Johnston | 918 | UnitedHealth Group, Inc. | 46.5% | 48 | 36.2% |
| Kingfisher | 869 | Humana Inc. | 54.0% | 50 | 27.7% |
| Latimer | 856 | UnitedHealth Group, Inc. | 56.2% | 49 | 34.4% |
| Woodward | 824 | Humana Inc. | 67.4% | 48 | 21.1% |
| Murray | 809 | UnitedHealth Group, Inc. | 47.3% | 50 | 24.8% |
| Love | 738 | UnitedHealth Group, Inc. | 62.2% | 50 | 31.8% |
| Kiowa | 719 | Humana Inc. | 50.3% | 47 | 32.0% |
| Washita | 640 | UnitedHealth Group, Inc. | 94.8% | 48 | 25.8% |
| Tillman | 558 | UnitedHealth Group, Inc. | 78.0% | 48 | 33.8% |
| Noble | 556 | UnitedHealth Group, Inc. | 47.8% | 47 | 24.5% |
| Blaine | 513 | UnitedHealth Group, Inc. | 43.9% | 48 | 28.2% |
| Texas | 486 | UnitedHealth Group, Inc. | 92.2% | 48 | 17.5% |
| Coal | 399 | UnitedHealth Group, Inc. | 65.7% | 47 | 30.3% |
| Jefferson | 363 | UnitedHealth Group, Inc. | 65.8% | 49 | 27.2% |
| Cotton | 321 | UnitedHealth Group, Inc. | 58.3% | 49 | 27.7% |
| Greer | 267 | UnitedHealth Group, Inc. | 88.4% | 49 | 23.7% |
| Major | 250 | UnitedHealth Group, Inc. | 48.4% | 46 | 18.0% |
| Woods | 228 | UnitedHealth Group, Inc. | 76.8% | 47 | 16.4% |
| Alfalfa | 175 | UnitedHealth Group, Inc. | 81.7% | 46 | 18.2% |
| Grant | 140 | UnitedHealth Group, Inc. | 41.4% | 46 | 20.4% |
| Harmon | 109 | UnitedHealth Group, Inc. | 100.0% | 47 | 28.7% |
| Beaver | 108 | UnitedHealth Group, Inc. | 86.1% | 47 | 16.1% |
| Ellis | 107 | UnitedHealth Group, Inc. | 88.8% | 48 | 16.5% |
| Dewey | 104 | Humana Inc. | 74.0% | 47 | 19.5% |
| Roger Mills | 93 | UnitedHealth Group, Inc. | 100.0% | 47 | 15.0% |
| Cimarron | 61 | UnitedHealth Group, Inc. | 72.1% | 47 | 18.1% |
| Harper | 51 | UnitedHealth Group, Inc. | 100.0% | 47 | 11.8% |
What is missing
CMS suppresses any plan-county cell with fewer than 11 enrollees. Those enrollees are missing from these counts, so every figure is a floor, not an exact total.
What is counted
Counts cover Medicare Advantage contracts only (Local CCP, Regional CCP, PFFS and MSA). Standalone Part D drug plans, cost plans, HCPP and PACE contracts are excluded.
Source: CMS Monthly Enrollment by Contract/Plan/State/County (CPSC).