Medicare Advantage in Yamhill County, Oregon
14,875 people in Yamhill County, Oregon were enrolled in Medicare Advantage in October 2026, 59.3% of 25,103 eligible beneficiaries (−0.7 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 47% of reported enrollment; 11 parent organizations have 11 or more members and the HHI is 2,989 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 4,102 members here are in plans that terminate or leave the county, and Providence St Joseph Health leaves. MA plans offered go from 29 to 27.
Parent organizations in Yamhill County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 6,936 | +642 | 46.8% |
| Providence St Joseph Health | 3,449 | −215 | 23.3% |
| Kaiser Foundation Health Plan, Inc. | 1,897 | +64 | 12.8% |
| Cambia Health Solutions, Inc. | 1,117 | −162 | 7.5% |
| CVS Health Corporation | 633 | −15 | 4.3% |
| Centene Corporation | 555 | −164 | 3.7% |
| ATRIO Health Plans | 136 | −36 | 0.9% |
| Marquis Companies I, Inc. | 36 | +10 | 0.2% |
| Elevance Health, Inc. | 23 | +3 | 0.2% |
| Humana Inc. | 19 | 0 | 0.1% |
| Providence Health & Services | 11 | −1 | under 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 4,017 beneficiaries in Yamhill County were assigned to 53 Medicare Shared Savings Program ACOs, 58.5% of assignable Original Medicare beneficiaries. Together, roughly 83% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.