Medicare Advantage in Mason County, Texas
502 people in Mason County, Texas were enrolled in Medicare Advantage in October 2026, 35.0% of 1,433 eligible beneficiaries (−0.4 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 57% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,634 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 16 members here are in plans that terminate or leave the county. MA plans offered go from 12 to 10.
Parent organizations in Mason County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 272 | −7 | 56.7% |
| Humana Inc. | 66 | +9 | 13.8% |
| Devoted Health, Inc. | 49 | +31 | 10.2% |
| CVS Health Corporation | 36 | −3 | 7.5% |
| Centene Corporation | 34 | 0 | 7.1% |
| Health Care Service Corporation | 23 | −32 | 4.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 126 beneficiaries in Mason County were assigned to 13 Medicare Shared Savings Program ACOs, 16.6% of assignable Original Medicare beneficiaries. Together, roughly 46% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.