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Top MA Enrollment Contracts in California (Feb 2026)
This page summarizes county-level Medicare Advantage enrollment by contract in California.
Home / Data Tools / MA Enrollment / MA State Rankings / California
Data source: SCC Enrollment MA Alternative File (2026-02). State total enrollment shown: 3,684,080.
Top 10 Contracts
| Rank | Contract ID | Organization Name | Plan Type | Enrolled | Counties | State Share |
|---|---|---|---|---|---|---|
| 1 | H0524 | KAISER FOUNDATION HP, INC. | HMO/HMOPOS | 1,364,607 | 50 | 37.0% |
| 2 | H5425 | SCAN HEALTH PLAN | HMO/HMOPOS | 381,895 | 38 | 10.4% |
| 3 | H0543 | UHC OF CALIFORNIA | HMO/HMOPOS | 258,746 | 32 | 7.0% |
| 4 | H3815 | ALIGNMENT HEALTH PLAN | HMO/HMOPOS | 211,699 | 27 | 5.7% |
| 5 | H8794 | KAISER FOUNDATION HP, INC. | HMO/HMOPOS | 137,487 | 29 | 3.7% |
| 6 | H2001 | SIERRA HEALTH AND LIFE INSURANCE COMPANY, INC. | Local PPO | 126,875 | 57 | 3.4% |
| 7 | H5619 | ARCADIAN HEALTH PLAN, INC. | HMO/HMOPOS | 111,819 | 20 | 3.0% |
| 8 | H4471 | BLUE CROSS OF CALIFORNIA PARTNERSHIP PLAN, INC. | HMO/HMOPOS | 103,844 | 18 | 2.8% |
| 9 | H4036 | ANTHEM INSURANCE COMPANIES, INC. | Local PPO | 68,159 | 56 | 1.9% |
| 10 | H0504 | CALIFORNIA PHYSICIANS' SERVICE | HMO/HMOPOS | 56,776 | 17 | 1.5% |
Method note: Enrollment is based on legal state/county of residence for payment purposes and may include out-of-service-area beneficiaries.
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