Medicare Advantage in Ottawa County, Oklahoma
3,888 people in Ottawa County, Oklahoma were enrolled in Medicare Advantage in October 2026, 47.2% of 8,234 eligible beneficiaries (+1.9 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 48% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 4,088 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 29 members here are in plans that terminate or leave the county, and Centene Corporation leaves. MA plans offered go from 24 to 23.
Parent organizations in Ottawa County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,856 | −653 | 48.1% |
| Humana Inc. | 1,608 | +732 | 41.7% |
| Devoted Health, Inc. | 157 | new | 4.1% |
| CVS Health Corporation | 134 | −46 | 3.5% |
| St Francis Health System & St John Health System | 54 | +10 | 1.4% |
| Centene Corporation | 47 | −26 | 1.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,649 beneficiaries in Ottawa County were assigned to 26 Medicare Shared Savings Program ACOs, 47.2% of assignable Original Medicare beneficiaries. Together, roughly 72% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.