Medicare Advantage in Grimes County, Texas
3,860 people in Grimes County, Texas were enrolled in Medicare Advantage in October 2026, 50.7% of 7,618 eligible beneficiaries (+0.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 60% of reported enrollment; 10 parent organizations have 11 or more members and the HHI is 3,869 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 885 members here are in plans that terminate or leave the county, and Health Care Service Corporation, Mitchell Family Office leave. MA plans offered go from 32 to 25.
Parent organizations in Grimes County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 2,277 | +135 | 59.6% |
| CVS Health Corporation | 480 | −81 | 12.6% |
| Baylor Scott & White Health | 329 | +27 | 8.6% |
| Health Care Service Corporation | 211 | −55 | 5.5% |
| Humana Inc. | 193 | −37 | 5.1% |
| Devoted Health, Inc. | 175 | new | 4.6% |
| Elevance Health, Inc. | 88 | +32 | 2.3% |
| Centene Corporation | 38 | −42 | 1.0% |
| Mitchell Family Office | 15 | −3 | 0.4% |
| Rifkin Managed Care Holding, LLC | 14 | −2 | 0.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,252 beneficiaries in Grimes County were assigned to 36 Medicare Shared Savings Program ACOs, 51.9% of assignable Original Medicare beneficiaries. Together, roughly 76% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.