Medicare Advantage in Custer County, Oklahoma
1,386 people in Custer County, Oklahoma were enrolled in Medicare Advantage in October 2026, 26.1% of 5,320 eligible beneficiaries (+0.7 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 76% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 6,199 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 40 members here are in plans that terminate or leave the county, and Health Care Service Corporation leaves. MA plans offered go from 15 to 8.
Parent organizations in Custer County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,047 | −49 | 76.5% |
| CVS Health Corporation | 239 | +76 | 17.5% |
| Health Care Service Corporation | 82 | +57 | 6.0% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 307 beneficiaries in Custer County were assigned to 21 Medicare Shared Savings Program ACOs, 11.5% of assignable Original Medicare beneficiaries. Together, roughly 35% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.