Medicare Advantage in Shiawassee County, Michigan
11,962 people in Shiawassee County, Michigan were enrolled in Medicare Advantage in October 2026, 67.9% of 17,610 eligible beneficiaries (−0.04 pts since October 2025). Blue Cross Blue Shield of Michigan Mutual Ins. Co. is the largest parent organization with 49% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 3,063 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 48 to 47.
Parent organizations in Shiawassee County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 5,880 | −522 | 49.3% |
| Humana Inc. | 2,183 | +197 | 18.3% |
| Henry Ford Health System | 1,636 | +596 | 13.7% |
| CVS Health Corporation | 900 | +174 | 7.5% |
| Corewell Health | 721 | +219 | 6.0% |
| UnitedHealth Group, Inc. | 427 | −56 | 3.6% |
| McLaren Health Care Corporation | 54 | −24 | 0.5% |
| Centene Corporation | 53 | +6 | 0.4% |
| Molina Healthcare, Inc. | 51 | −11 | 0.4% |
| A&D Charitable Foundation, Inc. | 17 | +5 | 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,307 beneficiaries in Shiawassee County were assigned to 28 Medicare Shared Savings Program ACOs, 30.3% of assignable Original Medicare beneficiaries. Together, roughly 78% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.