Medicare Advantage in Oceana County, Michigan
5,563 people in Oceana County, Michigan were enrolled in Medicare Advantage in October 2026, 71.0% of 7,833 eligible beneficiaries (+1.1 pts since October 2025). Corewell Health is the largest parent organization with 44% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 2,661 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,820 members here are in plans that terminate or leave the county. MA plans offered go from 42 to 40.
Parent organizations in Oceana County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Corewell Health | 2,423 | +377 | 44.0% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 1,215 | −509 | 22.0% |
| Humana Inc. | 571 | +34 | 10.4% |
| Trinity Health Corporation | 375 | +155 | 6.8% |
| Henry Ford Health System | 362 | +189 | 6.6% |
| UnitedHealth Group, Inc. | 344 | +51 | 6.2% |
| CVS Health Corporation | 119 | −146 | 2.2% |
| Centene Corporation | 84 | +43 | 1.5% |
| Molina Healthcare, Inc. | 19 | −4 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,583 beneficiaries in Oceana County were assigned to 29 Medicare Shared Savings Program ACOs, 80.0% of assignable Original Medicare beneficiaries. Together, roughly 94% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.