Medicare Advantage in Owyhee County, Idaho
1,513 people in Owyhee County, Idaho were enrolled in Medicare Advantage in October 2026, 53.8% of 2,810 eligible beneficiaries (−3.0 pts since October 2025). Trinity Health Corporation is the largest parent organization with 26% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 1,931 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 586 members here are in plans that terminate or leave the county, and Trinity Health Corporation, PacificSource leave. MA plans offered go from 21 to 14.
Parent organizations in Owyhee County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Trinity Health Corporation | 390 | +313 | 26.5% |
| Gemstone Holdings, Inc. | 302 | −362 | 20.5% |
| Humana Inc. | 295 | +81 | 20.1% |
| UnitedHealth Group, Inc. | 255 | −89 | 17.3% |
| Molina Healthcare, Inc. | 127 | −14 | 8.6% |
| PacificSource | 78 | +35 | 5.3% |
| CVS Health Corporation | 13 | +2 | 0.9% |
| Elevance Health, Inc. | 11 | new | 0.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 272 beneficiaries in Owyhee County were assigned to 10 Medicare Shared Savings Program ACOs, 40.8% of assignable Original Medicare beneficiaries. Together, roughly 73% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.