Medicare Advantage in Stephens County, Oklahoma
3,058 people in Stephens County, Oklahoma were enrolled in Medicare Advantage in October 2026, 26.7% of 11,469 eligible beneficiaries (+1.6 pts since October 2025). Humana Inc. is the largest parent organization with 49% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,485 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 91 members here are in plans that terminate or leave the county. MA plans offered go from 22 to 19.
Parent organizations in Stephens County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 1,474 | +343 | 48.6% |
| UnitedHealth Group, Inc. | 921 | −377 | 30.4% |
| St Francis Health System & St John Health System | 319 | new | 10.5% |
| CVS Health Corporation | 280 | −7 | 9.2% |
| Mitchell Family Office | 22 | +3 | 0.7% |
| Health Care Service Corporation | 15 | −72 | 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, 4,897 beneficiaries in Stephens County were assigned to 26 Medicare Shared Savings Program ACOs, 72.6% of assignable Original Medicare beneficiaries. Together, roughly 80% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.