Medicare Advantage in Montcalm County, Michigan
11,607 people in Montcalm County, Michigan were enrolled in Medicare Advantage in October 2026, 71.7% of 16,194 eligible beneficiaries (+1.3 pts since October 2025). Corewell Health is the largest parent organization with 45% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 2,922 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 560 members here are in plans that terminate or leave the county. MA plans offered go from 61 to 58.
Parent organizations in Montcalm County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Corewell Health | 5,225 | +501 | 45.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 2,995 | −437 | 25.9% |
| Humana Inc. | 1,358 | +121 | 11.7% |
| UnitedHealth Group, Inc. | 700 | +9 | 6.0% |
| CVS Health Corporation | 605 | +48 | 5.2% |
| Henry Ford Health System | 356 | +242 | 3.1% |
| Centene Corporation | 119 | +1 | 1.0% |
| Trinity Health Corporation | 100 | +55 | 0.9% |
| Molina Healthcare, Inc. | 67 | −11 | 0.6% |
| PACE Central Michigan, Inc. | 20 | 0 | 0.2% |
| Curana Health Holdings, LLC | 15 | +3 | 0.1% |
| McLaren Health Care Corporation | 11 | −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, 2,599 beneficiaries in Montcalm County were assigned to 34 Medicare Shared Savings Program ACOs, 68.2% of assignable Original Medicare beneficiaries. Together, roughly 91% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.