Medicare Advantage in Isabella County, Michigan
7,566 people in Isabella County, Michigan were enrolled in Medicare Advantage in October 2026, 59.2% of 12,777 eligible beneficiaries (+0.8 pts since October 2025). Blue Cross Blue Shield of Michigan Mutual Ins. Co. is the largest parent organization with 46% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,996 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 1,206 members here are in plans that terminate or leave the county. MA plans offered go from 36 to 30.
Parent organizations in Isabella County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 3,480 | −759 | 46.2% |
| Humana Inc. | 1,562 | +108 | 20.7% |
| Corewell Health | 1,437 | +462 | 19.1% |
| Henry Ford Health System | 523 | +299 | 6.9% |
| CVS Health Corporation | 215 | −11 | 2.9% |
| UnitedHealth Group, Inc. | 180 | +138 | 2.4% |
| PACE Central Michigan, Inc. | 102 | +6 | 1.4% |
| Molina Healthcare, Inc. | 29 | +4 | 0.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 2,226 beneficiaries in Isabella County were assigned to 39 Medicare Shared Savings Program ACOs, 57.5% of assignable Original Medicare beneficiaries. Together, roughly 83% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.