Medicare Advantage in Yolo County, California
19,324 people in Yolo County, California were enrolled in Medicare Advantage in October 2026, 51.6% of 37,417 eligible beneficiaries (−0.2 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 43% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 2,485 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 3,836 members here are in plans that terminate or leave the county, and Elevance Health, Inc., Centene Corporation, Molina Healthcare, Inc. leave. MA plans offered go from 21 to 14.
Parent organizations in Yolo County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 8,279 | +263 | 43.0% |
| UnitedHealth Group, Inc. | 3,417 | −1,545 | 17.7% |
| Elevance Health, Inc. | 2,439 | +421 | 12.7% |
| Alignment Healthcare USA, LLC | 1,549 | +435 | 8.0% |
| CVS Health Corporation | 1,366 | −153 | 7.1% |
| SCAN Group | 1,200 | new | 6.2% |
| California Physicians' Service | 491 | +71 | 2.5% |
| Centene Corporation | 307 | −383 | 1.6% |
| Imperial Health Plan of California | 121 | +43 | 0.6% |
| Molina Healthcare, Inc. | 55 | −36 | 0.3% |
| Humana Inc. | 25 | +9 | 0.1% |
| Health Care Service Corporation | 17 | +3 | under 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 6,482 beneficiaries in Yolo County were assigned to 62 Medicare Shared Savings Program ACOs, 56.0% of assignable Original Medicare beneficiaries. Together, roughly 79% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.