Medicare Advantage in Seminole County, Oklahoma
2,702 people in Seminole County, Oklahoma were enrolled in Medicare Advantage in October 2026, 48.5% of 5,567 eligible beneficiaries (+0.1 pts since October 2025). Humana Inc. is the largest parent organization with 44% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,490 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 46 members here are in plans that terminate or leave the county, and Health Care Service Corporation, Centene Corporation leave. MA plans offered go from 31 to 30.
Parent organizations in Seminole County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 1,170 | +333 | 43.6% |
| UnitedHealth Group, Inc. | 1,000 | −282 | 37.3% |
| MHH Healthcare, L.P. | 361 | +20 | 13.5% |
| CVS Health Corporation | 80 | 0 | 3.0% |
| Health Care Service Corporation | 44 | −15 | 1.6% |
| Centene Corporation | 26 | −21 | 1.0% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 85 beneficiaries in Seminole County were assigned to 17 Medicare Shared Savings Program ACOs, 4.0% of assignable Original Medicare beneficiaries. Together, roughly 51% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.