Medicare Advantage in Siskiyou County, California
583 people in Siskiyou County, California were enrolled in Medicare Advantage in October 2026, 4.2% of 13,906 eligible beneficiaries (−4.8 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 37% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 2,596 (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 2 to 2.
Parent organizations in Siskiyou County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 195 | +21 | 37.0% |
| Imperial Health Plan of California | 159 | +105 | 30.2% |
| Elevance Health, Inc. | 61 | −27 | 11.6% |
| California Physicians' Service | 58 | −7 | 11.0% |
| CVS Health Corporation | 38 | −772 | 7.2% |
| Kaiser Foundation Health Plan, Inc. | 16 | −3 | 3.0% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,832 beneficiaries in Siskiyou County were assigned to 43 Medicare Shared Savings Program ACOs, 18.6% of assignable Original Medicare beneficiaries. Together, roughly 22% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.