Medicare Advantage in Dimmit County, Texas
1,333 people in Dimmit County, Texas were enrolled in Medicare Advantage in October 2026, 69.1% of 1,929 eligible beneficiaries (+1.4 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 77% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 6,099 (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 20 to 15.
Parent organizations in Dimmit County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,016 | +54 | 77.1% |
| CVS Health Corporation | 114 | −11 | 8.6% |
| Humana Inc. | 108 | −13 | 8.2% |
| Centene Corporation | 37 | −22 | 2.8% |
| Elevance Health, Inc. | 32 | new | 2.4% |
| Health Care Service Corporation | 11 | new | 0.8% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 132 beneficiaries in Dimmit County were assigned to 13 Medicare Shared Savings Program ACOs, 29.7% 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.