Medicare Advantage in Somerset County, New Jersey
24,210 people in Somerset County, New Jersey were enrolled in Medicare Advantage in October 2026, 35.1% of 68,993 eligible beneficiaries (−0.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 40% of reported enrollment; 9 parent organizations have 11 or more members and the HHI is 2,894 (highly concentrated). For 2027, 1,070 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 35 to 33.
Parent organizations in Somerset County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 9,757 | −728 | 40.4% |
| CVS Health Corporation | 7,801 | −136 | 32.3% |
| Clover Health Holdings, Inc. | 2,630 | +801 | 10.9% |
| Humana Inc. | 1,872 | +744 | 7.8% |
| Horizon Mutual Holdings, Inc | 1,410 | +135 | 5.8% |
| Elevance Health, Inc. | 340 | −79 | 1.4% |
| Centene Corporation | 232 | −24 | 1.0% |
| Health Care Service Corporation | 51 | −94 | 0.2% |
| Longevity Health Founders, LLC | 45 | −7 | 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, 17,543 beneficiaries in Somerset County were assigned to 143 Medicare Shared Savings Program ACOs, 57.7% of assignable Original Medicare beneficiaries. Together, roughly 73% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.