Medicare Advantage in Shasta County, California
3,658 people in Shasta County, California were enrolled in Medicare Advantage in October 2026, 7.4% of 49,164 eligible beneficiaries (−4.7 pts since October 2025). Elevance Health, Inc. is the largest parent organization with 35% of reported enrollment; 8 parent organizations have 11 or more members and the HHI is 2,611 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,007 members here are in plans that terminate or leave the county. MA plans offered go from 2 to 2.
Parent organizations in Shasta County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Elevance Health, Inc. | 1,254 | −2,027 | 35.3% |
| UnitedHealth Group, Inc. | 964 | +366 | 27.1% |
| Imperial Health Plan of California | 817 | +569 | 23.0% |
| California Physicians' Service | 327 | +2 | 9.2% |
| CVS Health Corporation | 116 | −1,191 | 3.3% |
| Kaiser Foundation Health Plan, Inc. | 45 | −3 | 1.3% |
| Humana Inc. | 17 | +1 | 0.5% |
| SCAN Group | 11 | new | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 16,015 beneficiaries in Shasta County were assigned to 86 Medicare Shared Savings Program ACOs, 49.4% of assignable Original Medicare beneficiaries. Together, roughly 53% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.