Medicare Advantage in Johnston County, Oklahoma
991 people in Johnston County, Oklahoma were enrolled in Medicare Advantage in October 2026, 38.1% of 2,603 eligible beneficiaries (+0.1 pts since October 2025). Humana Inc. is the largest parent organization with 48% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 4,450 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 227 members here are in plans that terminate or leave the county. MA plans offered go from 20 to 9.
Parent organizations in Johnston County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 460 | +127 | 48.3% |
| UnitedHealth Group, Inc. | 434 | −108 | 45.6% |
| CVS Health Corporation | 58 | −7 | 6.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 265 beneficiaries in Johnston County were assigned to 13 Medicare Shared Savings Program ACOs, 21.4% 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.