Medicare Advantage in Mercer County, New Jersey
33,420 people in Mercer County, New Jersey were enrolled in Medicare Advantage in October 2026, 45.5% of 73,486 eligible beneficiaries (−0.02 pts since October 2025). CVS Health Corporation is the largest parent organization with 47% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 2,934 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,219 members here are in plans that terminate or leave the county, and Independence Health Group, Inc., Health Care Service Corporation leave. MA plans offered go from 47 to 37.
Parent organizations in Mercer County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| CVS Health Corporation | 15,731 | +219 | 47.2% |
| UnitedHealth Group, Inc. | 7,367 | −702 | 22.1% |
| Clover Health Holdings, Inc. | 3,365 | +885 | 10.1% |
| Horizon Mutual Holdings, Inc | 2,568 | +224 | 7.7% |
| Humana Inc. | 2,215 | +838 | 6.7% |
| Elevance Health, Inc. | 578 | −206 | 1.7% |
| Centene Corporation | 514 | −34 | 1.5% |
| Independence Health Group, Inc. | 355 | −79 | 1.1% |
| Health Care Service Corporation | 256 | −347 | 0.8% |
| Capital Healthcare, INC. | 190 | +18 | 0.6% |
| Thomas Jefferson University | 99 | +53 | 0.3% |
| Longevity Health Founders, LLC | 62 | −16 | 0.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 14,442 beneficiaries in Mercer County were assigned to 123 Medicare Shared Savings Program ACOs, 52.7% of assignable Original Medicare beneficiaries. Together, roughly 74% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.