Medicare Advantage in Columbia County, Oregon
8,398 people in Columbia County, Oregon were enrolled in Medicare Advantage in October 2026, 60.9% of 13,792 eligible beneficiaries (−1.0 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 33% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 2,184 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 301 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 30 to 26.
Parent organizations in Columbia County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 2,751 | +51 | 32.9% |
| UnitedHealth Group, Inc. | 2,288 | +462 | 27.4% |
| Cambia Health Solutions, Inc. | 1,092 | −165 | 13.1% |
| Humana Inc. | 878 | +213 | 10.5% |
| Devoted Health, Inc. | 531 | +84 | 6.3% |
| CareOregon, Inc. | 408 | −60 | 4.9% |
| CVS Health Corporation | 246 | +65 | 2.9% |
| Providence St Joseph Health | 81 | −535 | 1.0% |
| Centene Corporation | 44 | −11 | 0.5% |
| Elevance Health, Inc. | 18 | +1 | 0.2% |
| Health Care Service Corporation | 17 | −78 | 0.2% |
| Providence Health & Services | 11 | new | 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, 2,092 beneficiaries in Columbia County were assigned to 34 Medicare Shared Savings Program ACOs, 65.3% of assignable Original Medicare beneficiaries. Together, roughly 86% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.