Medicare Advantage in Mendocino County, California
2,631 people in Mendocino County, California were enrolled in Medicare Advantage in October 2026, 10.8% of 24,382 eligible beneficiaries (−0.5 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 72% of reported enrollment; 6 parent organizations have 11 or more members and the HHI is 5,355 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,473 members here are in plans that terminate or leave the county, and UnitedHealth Group, Inc., Kaiser Foundation Health Plan, Inc. leave. MA plans offered go from 3 to 2.
Parent organizations in Mendocino County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 1,839 | −140 | 71.7% |
| California Physicians' Service | 267 | +16 | 10.4% |
| Imperial Health Plan of California | 218 | +50 | 8.5% |
| Elevance Health, Inc. | 94 | −3 | 3.7% |
| Kaiser Foundation Health Plan, Inc. | 89 | −38 | 3.5% |
| CVS Health Corporation | 57 | −4 | 2.2% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 532 beneficiaries in Mendocino County were assigned to 46 Medicare Shared Savings Program ACOs, 3.3% of assignable Original Medicare beneficiaries. Together, roughly 14% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.