Free tool · public CMS data
Oregon Medicare Advantage market share
In September 2026, 518,912 Oregon Medicare beneficiaries were enrolled in a Medicare Advantage plan across 92 parent carriers and 36 counties, led by UnitedHealth Group, Inc. with 30.1% of counted enrollment.
Data month
September 2026
Advantage enrollees
518,912
+0.2% vs September 2025
Parent carriers
92
Advantage penetration
54.6%
CMS Medicare Monthly Enrollment, 2024
Carriers in Oregon
CMS Monthly Enrollment by Contract/Plan/State/County (CPSC) · September 2026
| # | Parent organisation | Enrollees | Share | Counties | vs September 2025 |
|---|---|---|---|---|---|
| 1 | UnitedHealth Group, Inc. | 156,116 | 30.1% | 36 | +13.2% |
| 2 | Kaiser Foundation Health Plan, Inc. | 79,837 | 15.4% | 29 | +3.7% |
| 3 | Providence St Joseph Health | 55,387 | 10.7% | 24 | -16.1% |
| 4 | Cambia Health Solutions, Inc. | 44,099 | 8.5% | 36 | -3.7% |
| 5 | PacificSource | 36,560 | 7.0% | 36 | -8.0% |
| 6 | Centene Corporation | 36,161 | 7.0% | 27 | -9.6% |
| 7 | ATRIO Health Plans | 33,527 | 6.5% | 18 | -13.4% |
| 8 | Devoted Health, Inc. | 19,247 | 3.7% | 18 | +233.5% |
| 9 | CVS Health Corporation | 18,875 | 3.6% | 36 | +29.3% |
| 10 | Humana Inc. | 17,787 | 3.4% | 36 | +23.5% |
| 11 | CareOregon, Inc. | 13,005 | 2.5% | 13 | -18.1% |
| 12 | AllCare Health, Inc. | 2,434 | 0.5% | 7 | -4.3% |
| 13 | Elevance Health, Inc. | 1,655 | 0.3% | 36 | -2.1% |
| 14 | Samaritan Health Services, Inc. | 1,371 | 0.3% | 11 | -90.0% |
| 15 | Marquis Companies I, Inc. | 858 | 0.2% | 17 | +16.3% |
| 16 | California Physicians' Service | 600 | 0.1% | 36 | +6.0% |
| 17 | Health Care Service Corporation | 595 | 0.1% | 36 | -66.9% |
| 18 | Highmark Health | 561 | 0.1% | 36 | -3.3% |
| 19 | Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 237 | 0.0% | 36 | +0.4% |
| 20 | Alignment Healthcare USA, LLC | 0 | 0.0% | 36 | — |
| 21 | Allina Health and Aetna Insurance Holding Company | 0 | 0.0% | 36 | — |
| 22 | Astiva Health Holdings Incorporated | 0 | 0.0% | 4 | — |
| 23 | Aultman Health Foundation | 0 | 0.0% | 36 | — |
| 24 | Aware Integrated, Inc. | 0 | 0.0% | 36 | — |
| 25 | Baylor Scott & White Health | 0 | 0.0% | 1 | — |
| 26 | Baystate Health, Inc. | 0 | 0.0% | 36 | — |
| 27 | Blue Cross & Blue Shield of Rhode Island | 0 | 0.0% | 36 | — |
| 28 | Blue Cross and Blue Shield of Massachusetts, Inc. | 0 | 0.0% | 36 | — |
| 29 | Blue Cross Blue Shield of Arizona | 0 | 0.0% | 3 | — |
| 30 | Blue Cross Blue Shield of Kansas | 0 | 0.0% | 36 | — |
| 31 | Blue Cross Blue Shield of Nebraska | 0 | 0.0% | 36 | — |
| 32 | BlueCross BlueShield of Alabama | 0 | 0.0% | 36 | — |
| 33 | BlueCross BlueShield of South Carolina (BCBSSC) | 0 | 0.0% | 36 | — |
| 34 | BlueCross BlueShield of Tennessee | 0 | 0.0% | 36 | — |
| 35 | CAPITAL BLUE CROSS | 0 | 0.0% | 36 | — |
| 36 | CareFirst, Inc. | 0 | 0.0% | 36 | — |
| 37 | Champion Health Plans-USA, LLC. | 0 | 0.0% | 1 | — |
| 38 | Clever Care Health Plan, Inc. | 0 | 0.0% | 1 | — |
| 39 | Community Health Group | 0 | 0.0% | 5 | — |
| 40 | Community Health Plan of Washington | 0 | 0.0% | 2 | — |
| 41 | Corewell Health | 0 | 0.0% | 36 | — |
| 42 | CuraCor Solutions Corp. | 0 | 0.0% | 36 | — |
| 43 | EmblemHealth, Inc. | 0 | 0.0% | 36 | — |
| 44 | Fallon Community Health Plan, Inc. | 0 | 0.0% | 36 | — |
| 45 | Fenyx Health Holdings, Inc. | 0 | 0.0% | 36 | — |
| 46 | Gemstone Holdings, Inc. | 0 | 0.0% | 3 | — |
| 47 | General Catalyst Group Management Holdings LP | 0 | 0.0% | 36 | — |
| 48 | Gold Kidney Health Plan | 0 | 0.0% | 2 | — |
| 49 | Guidewell Mutual Holding Corporation | 0 | 0.0% | 36 | — |
| 50 | Hawaii Medical Service Association | 0 | 0.0% | 36 | — |
| 51 | Health Plan of San Mateo | 0 | 0.0% | 4 | — |
| 52 | Healthfirst, Inc. | 0 | 0.0% | 36 | — |
| 53 | HealthPartners, Inc. | 0 | 0.0% | 36 | — |
| 54 | Henry Ford Health System | 0 | 0.0% | 36 | — |
| 55 | Horizon Mutual Holdings, Inc | 0 | 0.0% | 36 | — |
| 56 | Imperial Health Plan of California | 0 | 0.0% | 11 | — |
| 57 | Independence Health Group, Inc. | 0 | 0.0% | 36 | — |
| 58 | Independent Health Association, Inc. | 0 | 0.0% | 36 | — |
| 59 | Intermountain Health Care, Inc. | 0 | 0.0% | 4 | — |
| 60 | Lifetime Healthcare, Inc. | 0 | 0.0% | 36 | — |
| 61 | Local Initiative Health Authority for LA County | 0 | 0.0% | 2 | — |
| 62 | Longevity Health Founders, LLC | 0 | 0.0% | 2 | — |
| 63 | Louisiana Health Service & Indemnity Company | 0 | 0.0% | 36 | — |
| 64 | Lumeris Group Holdings Corporation | 0 | 0.0% | 2 | — |
| 65 | Martin's Point Health Care, Inc. | 0 | 0.0% | 36 | — |
| 66 | Medica Holding Company | 0 | 0.0% | 36 | — |
| 67 | MEDICAL MUTUAL OF OHIO | 0 | 0.0% | 36 | — |
| 68 | MHH Healthcare, L.P. | 0 | 0.0% | 1 | — |
| 69 | Molina Healthcare, Inc. | 0 | 0.0% | 9 | — |
| 70 | Montage Health | 0 | 0.0% | 1 | — |
| 71 | MVP Health Care, Inc. | 0 | 0.0% | 36 | — |
| 72 | NEIGHBORHOOD HEALTH PLAN OF RHODE ISLAND | 0 | 0.0% | 1 | — |
| 73 | Network Health, Inc. | 0 | 0.0% | 36 | — |
| 74 | Orange County Health Authority | 0 | 0.0% | 2 | — |
| 75 | Presbyterian Healthcare Services | 0 | 0.0% | 4 | — |
| 76 | Risant Health, Inc. | 0 | 0.0% | 1 | — |
| 77 | Sanford Health | 0 | 0.0% | 2 | — |
| 78 | SANTA CLARA COUNTY HEALTH AUTHORITY | 0 | 0.0% | 1 | — |
| 79 | SCAN Group | 0 | 0.0% | 19 | — |
| 80 | Sharp Healthcare | 0 | 0.0% | 1 | — |
| 81 | The Health Plan of West Virginia, Inc. | 0 | 0.0% | 36 | — |
| 82 | The Regents of the University of California | 0 | 0.0% | 2 | — |
| 83 | Thomas Jefferson University | 0 | 0.0% | 1 | — |
| 84 | Trinity Health Corporation | 0 | 0.0% | 13 | — |
| 85 | Triton Health Systems, L.L.C. | 0 | 0.0% | 1 | — |
| 86 | Troy Holdings, Inc. | 0 | 0.0% | 1 | — |
| 87 | Universal Health Services, Inc. | 0 | 0.0% | 11 | — |
| 88 | UPMC Health System | 0 | 0.0% | 36 | — |
| 89 | USAble Mutual Insurance Company | 0 | 0.0% | 36 | — |
| 90 | Village Care of New York, Inc. | 0 | 0.0% | 1 | — |
| 91 | Visiting Nurse Service of New York | 0 | 0.0% | 1 | — |
| 92 | Zing Health Consolidator, Inc | 0 | 0.0% | 1 | — |
County view
Leading carrier and Advantage enrollment in each Oregon county. Penetration is from CMS Medicare Monthly Enrollment, 2024.
| County | Advantage enrollees | Leading carrier | Leader share | Carriers | Penetration |
|---|---|---|---|---|---|
| Multnomah | 90,608 | Kaiser Foundation Health Plan, Inc. | 27.0% | 73 | 66.1% |
| Washington | 68,029 | UnitedHealth Group, Inc. | 31.3% | 67 | 64.4% |
| Clackamas | 65,630 | UnitedHealth Group, Inc. | 29.9% | 58 | 66.5% |
| Lane | 61,791 | UnitedHealth Group, Inc. | 51.7% | 64 | 63.1% |
| Marion | 46,513 | UnitedHealth Group, Inc. | 49.1% | 66 | 65.0% |
| Jackson | 30,521 | Cambia Health Solutions, Inc. | 26.0% | 63 | 48.3% |
| Deschutes | 20,498 | PacificSource | 88.8% | 64 | 43.0% |
| Linn | 19,825 | Centene Corporation | 26.1% | 60 | 61.2% |
| Douglas | 18,381 | ATRIO Health Plans | 67.0% | 61 | 49.5% |
| Josephine | 16,626 | Cambia Health Solutions, Inc. | 27.2% | 59 | 56.4% |
| Yamhill | 14,665 | UnitedHealth Group, Inc. | 46.9% | 58 | 58.1% |
| Polk | 13,311 | UnitedHealth Group, Inc. | 48.4% | 58 | 64.9% |
| Benton | 9,909 | Cambia Health Solutions, Inc. | 35.6% | 58 | 53.8% |
| Columbia | 8,283 | Kaiser Foundation Health Plan, Inc. | 33.2% | 56 | 61.0% |
| Klamath | 7,483 | ATRIO Health Plans | 91.2% | 56 | 41.1% |
| Lincoln | 5,506 | Devoted Health, Inc. | 84.9% | 57 | 32.7% |
| Coos | 5,191 | Centene Corporation | 87.4% | 56 | 29.7% |
| Crook | 3,246 | PacificSource | 93.7% | 51 | 43.5% |
| Jefferson | 2,528 | PacificSource | 95.3% | 52 | 45.0% |
| Malheur | 2,249 | Humana Inc. | 98.8% | 53 | 32.9% |
| Wasco | 2,026 | PacificSource | 92.9% | 50 | 33.2% |
| Hood River | 1,704 | PacificSource | 48.9% | 53 | 33.9% |
| Tillamook | 1,074 | Devoted Health, Inc. | 72.3% | 55 | 13.5% |
| Baker | 783 | Humana Inc. | 90.2% | 51 | 15.7% |
| Clatsop | 470 | UnitedHealth Group, Inc. | 39.1% | 55 | 7.3% |
| Umatilla | 470 | UnitedHealth Group, Inc. | 85.1% | 55 | 12.0% |
| Curry | 393 | UnitedHealth Group, Inc. | 37.7% | 56 | 21.9% |
| Wallowa | 350 | Humana Inc. | 96.9% | 49 | 11.7% |
| Morrow | 334 | Humana Inc. | 93.1% | 49 | 14.5% |
| Union | 287 | UnitedHealth Group, Inc. | 56.8% | 49 | 15.2% |
| Sherman | 116 | PacificSource | 81.9% | 48 | 25.6% |
| Gilliam | 69 | Humana Inc. | 100.0% | 51 | 13.7% |
| Grant | 25 | UnitedHealth Group, Inc. | 100.0% | 50 | 27.1% |
| Harney | 18 | UnitedHealth Group, Inc. | 100.0% | 49 | 9.9% |
| Lake | 0 | Alignment Healthcare USA, LLC | — | 54 | 13.5% |
| Wheeler | 0 | Alignment Healthcare USA, LLC | — | 49 | 29.1% |
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).