Medicare Advantage in Boundary County, Idaho
1,331 people in Boundary County, Idaho were enrolled in Medicare Advantage in October 2026, 31.9% of 4,178 eligible beneficiaries (−11.5 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 86% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 7,523 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 207 members here are in plans that terminate or leave the county. MA plans offered go from 4 to 3.
Parent organizations in Boundary County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,124 | +590 | 86.1% |
| Molina Healthcare, Inc. | 130 | +9 | 10.0% |
| CVS Health Corporation | 24 | −3 | 1.8% |
| Elevance Health, Inc. | 16 | −1 | 1.2% |
| Humana Inc. | 11 | 0 | 0.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 839 beneficiaries in Boundary County were assigned to 26 Medicare Shared Savings Program ACOs, 54.1% of assignable Original Medicare beneficiaries. Together, roughly 69% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.