Medicare Advantage in Washington County, Oklahoma
4,995 people in Washington County, Oklahoma were enrolled in Medicare Advantage in October 2026, 38.6% of 12,926 eligible beneficiaries (+2.2 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 50% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 4,336 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 150 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 14 to 13.
Parent organizations in Washington County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 2,455 | +295 | 49.5% |
| St Francis Health System & St John Health System | 2,139 | −15 | 43.2% |
| Health Care Service Corporation | 196 | +30 | 4.0% |
| CVS Health Corporation | 104 | +3 | 2.1% |
| Humana Inc. | 63 | 0 | 1.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 2,831 beneficiaries in Washington County were assigned to 36 Medicare Shared Savings Program ACOs, 47.3% of assignable Original Medicare beneficiaries. Together, roughly 68% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.