Medicare Advantage in Tillman County, Oklahoma
602 people in Tillman County, Oklahoma were enrolled in Medicare Advantage in October 2026, 35.7% of 1,686 eligible beneficiaries (+0.7 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 76% of reported enrollment; 2 parent organizations have 11 or more members and the HHI is 6,395 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county. MA plans offered go from 13 to 11.
Parent organizations in Tillman County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 447 | −25 | 76.4% |
| Humana Inc. | 138 | +65 | 23.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 422 beneficiaries in Tillman County were assigned to 11 Medicare Shared Savings Program ACOs, 52.5% 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.