Medicare Advantage in Polk County, Oregon
13,463 people in Polk County, Oregon were enrolled in Medicare Advantage in October 2026, 64.8% of 20,765 eligible beneficiaries (−0.4 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 48% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 3,006 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,537 members here are in plans that terminate or leave the county, and Cambia Health Solutions, Inc. leaves. MA plans offered go from 21 to 19.
Parent organizations in Polk County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 6,464 | +1,878 | 48.3% |
| Kaiser Foundation Health Plan, Inc. | 2,726 | +126 | 20.4% |
| ATRIO Health Plans | 1,756 | −164 | 13.1% |
| Centene Corporation | 1,009 | −475 | 7.5% |
| Providence St Joseph Health | 559 | −1,087 | 4.2% |
| Cambia Health Solutions, Inc. | 449 | −77 | 3.4% |
| PacificSource | 327 | −22 | 2.4% |
| CVS Health Corporation | 63 | +2 | 0.5% |
| Humana Inc. | 23 | +4 | 0.2% |
| Elevance Health, Inc. | 19 | +3 | 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, 863 beneficiaries in Polk County were assigned to 41 Medicare Shared Savings Program ACOs, 19.6% of assignable Original Medicare beneficiaries. Together, roughly 72% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.