Medicare Advantage in Caribou County, Idaho
280 people in Caribou County, Idaho were enrolled in Medicare Advantage in October 2026, 18.2% of 1,541 eligible beneficiaries (−1.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 65% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 5,127 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 146 members here are in plans that terminate or leave the county. MA plans offered go from 7 to 4.
Parent organizations in Caribou County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 172 | 0 | 65.4% |
| Humana Inc. | 75 | −32 | 28.5% |
| Molina Healthcare, Inc. | 16 | new | 6.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 774 beneficiaries in Caribou County were assigned to 10 Medicare Shared Savings Program ACOs, 77.9% of assignable Original Medicare beneficiaries. Together, roughly 82% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.