Medicare Advantage in Marshall County, Oklahoma
1,670 people in Marshall County, Oklahoma were enrolled in Medicare Advantage in October 2026, 37.8% of 4,413 eligible beneficiaries (+0.9 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 73% of reported enrollment; 5 parent organizations have 11 or more members and the HHI is 5,577 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 828 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 18 to 6.
Parent organizations in Marshall County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,198 | +57 | 72.6% |
| CVS Health Corporation | 228 | +9 | 13.8% |
| Humana Inc. | 171 | +11 | 10.4% |
| Health Care Service Corporation | 42 | +12 | 2.5% |
| Mitchell Family Office | 11 | 0 | 0.7% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,028 beneficiaries in Marshall County were assigned to 19 Medicare Shared Savings Program ACOs, 50.2% of assignable Original Medicare beneficiaries. Together, roughly 69% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.