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Top MA Enrollment Contracts in Riverside-San Bernardino-Ontario, CA (Feb 2026)
This page summarizes county-level Medicare Advantage enrollment by contract in this metro area.
Home / Data Tools / MA Enrollment / MA MSA Rankings / Riverside-San Bernardino-Ontario, CA
MSA rank: 5 of top 50 by MA enrollment. CBSA: 40140. MSA total enrollment: 518,613.
Data source: SCC Enrollment MA Alternative File (2026-02).
Top 10 Contracts
| Rank | Contract ID | Organization Name | Plan Type | Enrolled | Counties | MSA Share |
|---|---|---|---|---|---|---|
| 1 | H0524 | KAISER FOUNDATION HP, INC. | HMO/HMOPOS | 154,778 | 2 | 29.8% |
| 2 | H5425 | SCAN HEALTH PLAN | HMO/HMOPOS | 89,592 | 2 | 17.3% |
| 3 | H0543 | UHC OF CALIFORNIA | HMO/HMOPOS | 66,247 | 2 | 12.8% |
| 4 | H8894 | Inland Empire Health Plan | HMO/HMOPOS | 38,550 | 2 | 7.4% |
| 5 | H3815 | ALIGNMENT HEALTH PLAN | HMO/HMOPOS | 27,492 | 2 | 5.3% |
| 6 | H8794 | KAISER FOUNDATION HP, INC. | HMO/HMOPOS | 14,755 | 2 | 2.8% |
| 7 | H5619 | ARCADIAN HEALTH PLAN, INC. | HMO/HMOPOS | 13,682 | 2 | 2.6% |
| 8 | H4161 | BLUE CROSS OF CALIFORNIA PARTNERSHIP PLAN, INC. | HMO/HMOPOS | 11,604 | 2 | 2.2% |
| 9 | H2001 | SIERRA HEALTH AND LIFE INSURANCE COMPANY, INC. | Local PPO | 9,294 | 2 | 1.8% |
| 10 | H0976 | SCAN HEALTH PLAN | HMO/HMOPOS | 8,663 | 2 | 1.7% |
Method note: Enrollment is based on legal state/county of residence for payment purposes and may include out-of-service-area beneficiaries.
Related Links
- Previous MSA: Chicago-Naperville-Schaumburg, IL
- Next MSA: Phoenix-Mesa-Chandler, AZ
- All top 50 MSA pages
- MA Enrollment search tool
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