Medicare Advantage in Cassia County, Idaho
1,820 people in Cassia County, Idaho were enrolled in Medicare Advantage in October 2026, 37.6% of 4,846 eligible beneficiaries (−4.3 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 55% of reported enrollment; 4 parent organizations have 11 or more members and the HHI is 4,050 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 866 members here are in plans that terminate or leave the county, and Humana Inc. leaves. MA plans offered go from 10 to 3.
Parent organizations in Cassia County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 980 | +299 | 54.7% |
| Gemstone Holdings, Inc. | 542 | −428 | 30.2% |
| Molina Healthcare, Inc. | 210 | −42 | 11.7% |
| Humana Inc. | 61 | −13 | 3.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 649 beneficiaries in Cassia County were assigned to 18 Medicare Shared Savings Program ACOs, 32.4% of assignable Original Medicare beneficiaries. Together, roughly 58% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.