Medicare Advantage in Castro County, Texas
513 people in Castro County, Texas were enrolled in Medicare Advantage in October 2026, 39.6% of 1,294 eligible beneficiaries (+1.4 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 72% of reported enrollment; 4 parent organizations have 11 or more members and the HHI is 5,607 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 16 to 8.
Parent organizations in Castro County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 350 | +28 | 72.2% |
| Centene Corporation | 92 | −2 | 19.0% |
| Humana Inc. | 22 | −3 | 4.5% |
| Elevance Health, Inc. | 21 | −6 | 4.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 104 beneficiaries in Castro County were assigned to 7 Medicare Shared Savings Program ACOs, 17.9% of assignable Original Medicare beneficiaries. Together, roughly 50% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.