Medicare Advantage in Solano County, California
52,268 people in Solano County, California were enrolled in Medicare Advantage in October 2026, 55.7% of 93,859 eligible beneficiaries (−0.8 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 85% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 7,298 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,242 members here are in plans that terminate or leave the county, and Molina Healthcare, Inc. leaves. MA plans offered go from 6 to 5.
Parent organizations in Solano County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 44,337 | +2,246 | 85.1% |
| UnitedHealth Group, Inc. | 3,244 | −482 | 6.2% |
| Elevance Health, Inc. | 1,290 | −805 | 2.5% |
| Molina Healthcare, Inc. | 1,213 | +745 | 2.3% |
| California Physicians' Service | 825 | +54 | 1.6% |
| Imperial Health Plan of California | 735 | +594 | 1.4% |
| CVS Health Corporation | 275 | −1,540 | 0.5% |
| Humana Inc. | 68 | +30 | 0.1% |
| Centene Corporation | 58 | −346 | 0.1% |
| SCAN Group | 25 | new | under 0.1% |
| Alignment Healthcare USA, LLC | 14 | new | under 0.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 14 | −5 | 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, 11,861 beneficiaries in Solano County were assigned to 97 Medicare Shared Savings Program ACOs, 54.7% of assignable Original Medicare beneficiaries. Together, roughly 80% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.