Medicare Advantage in Butte County, California
5,531 people in Butte County, California were enrolled in Medicare Advantage in October 2026, 11.3% of 49,102 eligible beneficiaries (−4.2 pts since October 2025). Elevance Health, Inc. is the largest parent organization with 34% of reported enrollment; 7 parent organizations have 11 or more members and the HHI is 2,568 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,604 members here are in plans that terminate or leave the county, and Kaiser Foundation Health Plan, Inc. leaves. MA plans offered go from 2 to 2.
Parent organizations in Butte County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Elevance Health, Inc. | 1,838 | −3,108 | 34.0% |
| UnitedHealth Group, Inc. | 1,456 | +252 | 26.9% |
| Imperial Health Plan of California | 1,274 | +896 | 23.6% |
| California Physicians' Service | 602 | +47 | 11.1% |
| CVS Health Corporation | 140 | −16 | 2.6% |
| Kaiser Foundation Health Plan, Inc. | 72 | −14 | 1.3% |
| Humana Inc. | 26 | +9 | 0.5% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 7,791 beneficiaries in Butte County were assigned to 98 Medicare Shared Savings Program ACOs, 24.5% of assignable Original Medicare beneficiaries. Together, roughly 33% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.