Medicare Advantage in Sussex County, Delaware
29,540 people in Sussex County, Delaware were enrolled in Medicare Advantage in October 2026, 30.1% of 97,997 eligible beneficiaries (−0.3 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 47% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 3,064 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 921 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 20 to 17.
Parent organizations in Sussex County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 13,792 | +3,906 | 46.9% |
| CVS Health Corporation | 7,297 | +871 | 24.8% |
| Humana Inc. | 4,241 | +1,238 | 14.4% |
| Highmark Health | 1,460 | −5,667 | 5.0% |
| Centene Corporation | 944 | +505 | 3.2% |
| Health Care Service Corporation | 583 | −240 | 2.0% |
| Elevance Health, Inc. | 369 | −22 | 1.3% |
| CareFirst, Inc. | 344 | +27 | 1.2% |
| Independence Health Group, Inc. | 273 | +200 | 0.9% |
| Milford Wellness Village PACE, LLC | 44 | +8 | 0.1% |
| Horizon Mutual Holdings, Inc | 39 | +18 | 0.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 30 | −8 | 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, 22,256 beneficiaries in Sussex County were assigned to 184 Medicare Shared Savings Program ACOs, 42.4% of assignable Original Medicare beneficiaries. Together, roughly 60% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.