Medicare Advantage in Chester County, Pennsylvania
37,335 people in Chester County, Pennsylvania were enrolled in Medicare Advantage in October 2026, 32.2% of 116,047 eligible beneficiaries (−1.0 pts since October 2025). Independence Health Group, Inc. is the largest parent organization with 30% of reported enrollment; 16 parent organizations have 11 or more members and the HHI is 2,079 (highly concentrated). For 2027, 979 members here are in plans that terminate or leave the county. MA plans offered go from 69 to 65.
Parent organizations in Chester County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Independence Health Group, Inc. | 10,971 | −841 | 29.5% |
| CVS Health Corporation | 9,799 | +63 | 26.3% |
| UnitedHealth Group, Inc. | 6,748 | −889 | 18.1% |
| Humana Inc. | 4,640 | +1,012 | 12.5% |
| Health Care Service Corporation | 1,243 | +47 | 3.3% |
| Elevance Health, Inc. | 1,226 | +4 | 3.3% |
| Highmark Health | 826 | −66 | 2.2% |
| Devoted Health, Inc. | 700 | +497 | 1.9% |
| Thomas Jefferson University | 346 | +175 | 0.9% |
| Centene Corporation | 314 | −66 | 0.8% |
| Trinity Health Corporation | 139 | +11 | 0.4% |
| Risant Health, Inc. | 125 | +53 | 0.3% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 55 | 0 | 0.1% |
| UPMC Health System | 43 | +7 | 0.1% |
| CAPITAL BLUE CROSS | 32 | +2 | 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, 38,957 beneficiaries in Chester County were assigned to 181 Medicare Shared Savings Program ACOs, 67.3% of assignable Original Medicare beneficiaries. Together, roughly 78% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.