Medicare Advantage in Rosebud County, Montana
464 people in Rosebud County, Montana were enrolled in Medicare Advantage in October 2026, 23.3% of 1,988 eligible beneficiaries (+1.0 pts since October 2025). Humana Inc. is the largest parent organization with 80% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 6,628 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 19 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 12 to 6.
Parent organizations in Rosebud County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 358 | +33 | 80.1% |
| Health Care Service Corporation | 57 | +14 | 12.8% |
| UMWA Health and Retirement Funds | 32 | −1 | 7.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 331 beneficiaries in Rosebud County were assigned to 10 Medicare Shared Savings Program ACOs, 34.7% of assignable Original Medicare beneficiaries. Together, roughly 50% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.