Medicare Advantage in Benton County, Oregon
10,037 people in Benton County, Oregon were enrolled in Medicare Advantage in October 2026, 49.3% of 20,357 eligible beneficiaries (−3.3 pts since October 2025). Cambia Health Solutions, Inc. is the largest parent organization with 35% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 2,158 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,210 members here are in plans that terminate or leave the county, and Centene Corporation leaves. MA plans offered go from 23 to 16.
Parent organizations in Benton County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Cambia Health Solutions, Inc. | 3,535 | +877 | 35.4% |
| UnitedHealth Group, Inc. | 2,211 | +361 | 22.1% |
| Centene Corporation | 1,424 | +173 | 14.3% |
| Devoted Health, Inc. | 1,168 | new | 11.7% |
| Providence St Joseph Health | 674 | −125 | 6.7% |
| Kaiser Foundation Health Plan, Inc. | 407 | +38 | 4.1% |
| Samaritan Health Services, Inc. | 343 | −2,949 | 3.4% |
| CVS Health Corporation | 95 | −11 | 1.0% |
| Highmark Health | 59 | −2 | 0.6% |
| Elevance Health, Inc. | 28 | +1 | 0.3% |
| Humana Inc. | 27 | +3 | 0.3% |
| California Physicians' Service | 16 | +4 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 632 beneficiaries in Benton County were assigned to 53 Medicare Shared Savings Program ACOs, 9.7% of assignable Original Medicare beneficiaries. Together, roughly 54% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.