Medicare Advantage in Harrison County, Texas
7,773 people in Harrison County, Texas were enrolled in Medicare Advantage in October 2026, 52.2% of 14,893 eligible beneficiaries (+1.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 42% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 3,249 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 945 members here are in plans that terminate or leave the county, and CHRISTUS Health leaves. MA plans offered go from 31 to 27.
Parent organizations in Harrison County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 3,215 | −139 | 41.7% |
| Humana Inc. | 2,819 | +383 | 36.5% |
| Health Care Service Corporation | 758 | +60 | 9.8% |
| CVS Health Corporation | 682 | −29 | 8.8% |
| CHRISTUS Health | 183 | +22 | 2.4% |
| Louisiana Health Service & Indemnity Company | 41 | +23 | 0.5% |
| Molina Healthcare, Inc. | 21 | −1 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 3,546 beneficiaries in Harrison County were assigned to 39 Medicare Shared Savings Program ACOs, 70.3% of assignable Original Medicare beneficiaries. Together, roughly 86% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.