Medicare Advantage in Missoula County, Montana
6,840 people in Missoula County, Montana were enrolled in Medicare Advantage in October 2026, 25.8% of 26,540 eligible beneficiaries (−1.1 pts since October 2025). Humana Inc. is the largest parent organization with 71% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 5,541 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,538 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 13 to 11.
Parent organizations in Missoula County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 4,787 | +793 | 70.6% |
| Health Care Service Corporation | 1,583 | −895 | 23.3% |
| UnitedHealth Group, Inc. | 215 | −61 | 3.2% |
| CVS Health Corporation | 127 | 0 | 1.9% |
| Cambia Health Solutions, Inc. | 35 | −5 | 0.5% |
| Elevance Health, Inc. | 35 | +4 | 0.5% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 7,250 beneficiaries in Missoula County were assigned to 80 Medicare Shared Savings Program ACOs, 53.1% of assignable Original Medicare beneficiaries. Together, roughly 65% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.