Medicare Advantage in Calhoun County, Michigan
18,321 people in Calhoun County, Michigan were enrolled in Medicare Advantage in October 2026, 56.0% of 32,707 eligible beneficiaries (+0.2 pts since October 2025). Blue Cross Blue Shield of Michigan Mutual Ins. Co. is the largest parent organization with 29% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 1,895 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 493 members here are in plans that terminate or leave the county. MA plans offered go from 53 to 51.
Parent organizations in Calhoun County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 5,306 | −486 | 29.1% |
| Corewell Health | 3,717 | +671 | 20.4% |
| Humana Inc. | 2,855 | +106 | 15.7% |
| UnitedHealth Group, Inc. | 2,757 | −495 | 15.1% |
| CVS Health Corporation | 2,012 | +261 | 11.0% |
| Centene Corporation | 994 | +54 | 5.5% |
| Henry Ford Health System | 280 | +201 | 1.5% |
| Comprehensive Senior Care Corporation | 278 | +1 | 1.5% |
| McLaren Health Care Corporation | 11 | −3 | under 0.1% |
| Molina Healthcare, Inc. | 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, 2,358 beneficiaries in Calhoun County were assigned to 68 Medicare Shared Savings Program ACOs, 22.7% of assignable Original Medicare beneficiaries. Together, roughly 66% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.