Medicare Advantage in St. Joseph County, Michigan
8,323 people in St. Joseph County, Michigan were enrolled in Medicare Advantage in October 2026, 57.5% of 14,480 eligible beneficiaries (+0.1 pts since October 2025). Blue Cross Blue Shield of Michigan Mutual Ins. Co. is the largest parent organization with 29% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 2,206 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 78 members here are in plans that terminate or leave the county. MA plans offered go from 38 to 38.
Parent organizations in St. Joseph County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 2,372 | −202 | 28.7% |
| Humana Inc. | 2,066 | +541 | 25.0% |
| Corewell Health | 1,921 | +270 | 23.2% |
| UnitedHealth Group, Inc. | 1,091 | −51 | 13.2% |
| Centene Corporation | 415 | +56 | 5.0% |
| CVS Health Corporation | 392 | −437 | 4.7% |
| Elevance Health, Inc. | 16 | 0 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,183 beneficiaries in St. Joseph County were assigned to 47 Medicare Shared Savings Program ACOs, 26.7% 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.