Medicare Advantage in Washtenaw County, Michigan
41,597 people in Washtenaw County, Michigan were enrolled in Medicare Advantage in October 2026, 59.4% of 70,067 eligible beneficiaries (−0.1 pts since October 2025). Blue Cross Blue Shield of Michigan Mutual Ins. Co. is the largest parent organization with 60% of reported enrollment; 17 parent organizations have 11 or more members and the HHI is 3,799 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 468 members here are in plans that terminate or leave the county, and MEDICAL MUTUAL OF OHIO leaves. MA plans offered go from 70 to 65.
Parent organizations in Washtenaw County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 24,736 | −697 | 59.6% |
| Corewell Health | 3,402 | +422 | 8.2% |
| Humana Inc. | 3,231 | +858 | 7.8% |
| CVS Health Corporation | 2,599 | +347 | 6.3% |
| UnitedHealth Group, Inc. | 2,345 | −361 | 5.7% |
| Henry Ford Health System | 2,047 | +661 | 4.9% |
| Trinity Health Corporation | 1,550 | +741 | 3.7% |
| Centene Corporation | 807 | +8 | 1.9% |
| Zing Health Consolidator, Inc | 297 | +119 | 0.7% |
| Utd Methodist Retirement Communities of SE MI | 204 | +6 | 0.5% |
| Molina Healthcare, Inc. | 95 | −13 | 0.2% |
| Curana Health Holdings, LLC | 48 | +18 | 0.1% |
| Elevance Health, Inc. | 45 | +6 | 0.1% |
| Longevity Health Founders, LLC | 27 | +5 | under 0.1% |
| MEDICAL MUTUAL OF OHIO | 20 | −1 | 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, 14,243 beneficiaries in Washtenaw County were assigned to 129 Medicare Shared Savings Program ACOs, 74.8% 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.