Medicare Advantage in Atascosa County, Texas
6,765 people in Atascosa County, Texas were enrolled in Medicare Advantage in October 2026, 64.1% of 10,546 eligible beneficiaries (+0.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 55% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 3,905 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 551 members here are in plans that terminate or leave the county. MA plans offered go from 49 to 39.
Parent organizations in Atascosa County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 3,700 | −505 | 55.3% |
| Humana Inc. | 1,845 | +551 | 27.6% |
| Health Care Service Corporation | 490 | +81 | 7.3% |
| CVS Health Corporation | 343 | −15 | 5.1% |
| Devoted Health, Inc. | 209 | +145 | 3.1% |
| Centene Corporation | 75 | −30 | 1.1% |
| Elevance Health, Inc. | 33 | +5 | 0.5% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 713 beneficiaries in Atascosa County were assigned to 26 Medicare Shared Savings Program ACOs, 31.0% of assignable Original Medicare beneficiaries. Together, roughly 75% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.