Medicare Advantage in Ottawa County, Michigan
49,364 people in Ottawa County, Michigan were enrolled in Medicare Advantage in October 2026, 77.3% of 63,858 eligible beneficiaries (+0.4 pts since October 2025). Corewell Health is the largest parent organization with 66% of reported enrollment; 14 parent organizations have 11 or more members and the HHI is 4,799 (highly concentrated). For 2027, 3,460 members here are in plans that terminate or leave the county. MA plans offered go from 56 to 55.
Parent organizations in Ottawa County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Corewell Health | 32,612 | +1,732 | 66.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 9,556 | −987 | 19.4% |
| Humana Inc. | 2,442 | +296 | 5.0% |
| UnitedHealth Group, Inc. | 1,360 | +13 | 2.8% |
| CVS Health Corporation | 1,319 | −9 | 2.7% |
| Trinity Health Corporation | 766 | +294 | 1.6% |
| Henry Ford Health System | 698 | +351 | 1.4% |
| LifeCircles | 232 | +24 | 0.5% |
| Centene Corporation | 127 | −14 | 0.3% |
| Curana Health Holdings, LLC | 51 | 0 | 0.1% |
| Molina Healthcare, Inc. | 49 | −7 | under 0.1% |
| Longevity Health Founders, LLC | 32 | −8 | under 0.1% |
| Elevance Health, Inc. | 30 | −1 | under 0.1% |
| Health Care Service Corporation | 11 | new | under 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, 5,476 beneficiaries in Ottawa County were assigned to 98 Medicare Shared Savings Program ACOs, 56.0% of assignable Original Medicare beneficiaries. Together, roughly 90% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.