Medicare Advantage in Granite County, Montana
242 people in Granite County, Montana were enrolled in Medicare Advantage in October 2026, 21.3% of 1,138 eligible beneficiaries (−2.8 pts since October 2025). Humana Inc. is the largest parent organization with 83% of reported enrollment; 2 parent organizations have 11 or more members and the HHI is 7,191 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 25 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 8 to 6.
Parent organizations in Granite County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 177 | +25 | 83.1% |
| Health Care Service Corporation | 36 | −16 | 16.9% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 234 beneficiaries in Granite County were assigned to 18 Medicare Shared Savings Program ACOs, 44.3% of assignable Original Medicare beneficiaries. Together, roughly 56% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.