Medicare Advantage in Gilliam County, Oregon
105 people in Gilliam County, Oregon were enrolled in Medicare Advantage in October 2026, 16.5% of 638 eligible beneficiaries (+1.1 pts since October 2025). Humana Inc. is the largest parent organization with 86% of reported enrollment; 2 parent organizations have 11 or more members and the HHI is 7,658 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 5 to 8.
Parent organizations in Gilliam County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 83 | +11 | 86.5% |
| UnitedHealth Group, Inc. | 13 | −2 | 13.5% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 139 beneficiaries in Gilliam County were assigned to 9 Medicare Shared Savings Program ACOs, 37.1% of assignable Original Medicare beneficiaries. Together, roughly 47% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.