Medicare Advantage in Benton County, Washington
13,671 people in Benton County, Washington were enrolled in Medicare Advantage in October 2026, 32.5% of 42,042 eligible beneficiaries (+0.9 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 53% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 4,049 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 3,602 members here are in plans that terminate or leave the county, and Providence St Joseph Health, Elevance Health, Inc. leave. MA plans offered go from 15 to 9.
Parent organizations in Benton County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 7,187 | −534 | 52.9% |
| Humana Inc. | 4,749 | +1,653 | 34.9% |
| Providence St Joseph Health | 614 | +61 | 4.5% |
| Community Health Plan of Washington | 337 | −255 | 2.5% |
| CVS Health Corporation | 280 | −12 | 2.1% |
| Molina Healthcare, Inc. | 177 | −14 | 1.3% |
| Centene Corporation | 169 | −288 | 1.2% |
| Elevance Health, Inc. | 59 | +33 | 0.4% |
| Cambia Health Solutions, Inc. | 23 | −1 | 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, 12,349 beneficiaries in Benton County were assigned to 94 Medicare Shared Savings Program ACOs, 57.1% of assignable Original Medicare beneficiaries. Together, roughly 71% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.