Medicare Advantage in Tehama County, California
1,457 people in Tehama County, California were enrolled in Medicare Advantage in October 2026, 9.5% of 15,364 eligible beneficiaries (−5.2 pts since October 2025). Elevance Health, Inc. is the largest parent organization with 47% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 3,179 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 616 members here are in plans that terminate or leave the county. MA plans offered go from 2 to 2.
Parent organizations in Tehama County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Elevance Health, Inc. | 674 | −995 | 47.4% |
| Imperial Health Plan of California | 361 | +211 | 25.4% |
| UnitedHealth Group, Inc. | 198 | +23 | 13.9% |
| California Physicians' Service | 127 | −4 | 8.9% |
| CVS Health Corporation | 41 | −4 | 2.9% |
| Kaiser Foundation Health Plan, Inc. | 20 | −4 | 1.4% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 1,236 beneficiaries in Tehama County were assigned to 38 Medicare Shared Savings Program ACOs, 12.9% of assignable Original Medicare beneficiaries. Together, roughly 21% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.