Medicare Advantage in Adams County, Idaho
576 people in Adams County, Idaho were enrolled in Medicare Advantage in October 2026, 34.9% of 1,649 eligible beneficiaries (−7.5 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 64% of reported enrollment; 4 parent organizations have 11 or more members and the HHI is 4,935 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 432 members here are in plans that terminate or leave the county, and Trinity Health Corporation leaves. MA plans offered go from 10 to 4.
Parent organizations in Adams County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 343 | +122 | 64.2% |
| Trinity Health Corporation | 149 | +129 | 27.9% |
| Molina Healthcare, Inc. | 22 | −2 | 4.1% |
| Humana Inc. | 20 | −7 | 3.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 267 beneficiaries in Adams County were assigned to 17 Medicare Shared Savings Program ACOs, 40.7% of assignable Original Medicare beneficiaries. Together, roughly 61% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.