Medicare Advantage in Ventura County, California
73,216 people in Ventura County, California were enrolled in Medicare Advantage in October 2026, 41.1% of 177,992 eligible beneficiaries (−0.9 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 41% of reported enrollment; 17 parent organizations have 11 or more members and the HHI is 2,345 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,842 members here are in plans that terminate or leave the county, and CVS Health Corporation, Centene Corporation, The Regents of the University of California and others leave. MA plans offered go from 20 to 17.
Parent organizations in Ventura County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 30,243 | +1,344 | 41.4% |
| Elevance Health, Inc. | 12,731 | −358 | 17.4% |
| Humana Inc. | 9,545 | +1,838 | 13.1% |
| SCAN Group | 5,660 | +149 | 7.8% |
| Alignment Healthcare USA, LLC | 5,432 | +1,123 | 7.4% |
| CVS Health Corporation | 3,211 | +573 | 4.4% |
| UnitedHealth Group, Inc. | 2,805 | −4,653 | 3.8% |
| Imperial Health Plan of California | 1,448 | +1,245 | 2.0% |
| Ventura County Medi-Cal Managed Care Commission | 747 | new | 1.0% |
| Centene Corporation | 534 | −1,582 | 0.7% |
| California Physicians' Service | 287 | +31 | 0.4% |
| The Regents of the University of California | 165 | +100 | 0.2% |
| Molina Healthcare, Inc. | 141 | −63 | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 30 | −2 | under 0.1% |
| Local Initiative Health Authority for LA County | 19 | −1 | 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, 23,470 beneficiaries in Ventura County were assigned to 164 Medicare Shared Savings Program ACOs, 32.4% of assignable Original Medicare beneficiaries. Together, roughly 60% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.