Medicare Advantage in Trinity County, California
112 people in Trinity County, California were enrolled in Medicare Advantage in October 2026, 3.0% of 3,694 eligible beneficiaries (−3.1 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 49% of reported enrollment; 3 parent organizations have 11 or more members and the HHI is 3,708 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 0 members here are in plans that terminate or leave the county.
Parent organizations in Trinity County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 37 | −1 | 48.7% |
| California Physicians' Service | 22 | −5 | 28.9% |
| CVS Health Corporation | 17 | −102 | 22.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 371 beneficiaries in Trinity County were assigned to 20 Medicare Shared Savings Program ACOs, 14.1% of assignable Original Medicare beneficiaries. Together, roughly 17% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.