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Top MA Enrollment Contracts in Riverside-San Bernardino-Ontario, CA (Jul 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: 524,886.
Data source: SCC Enrollment MA Alternative File (2026-07).
Top 10 Contracts
| Rank | Contract ID | Organization Name | Plan Type | Enrolled | Counties | MSA Share |
|---|---|---|---|---|---|---|
| 1 | H0524 | KAISER FOUNDATION HP, INC. | HMO/HMOPOS | 157,018 | 2 | 29.9% |
| 2 | H5425 | SCAN HEALTH PLAN | HMO/HMOPOS | 91,975 | 2 | 17.5% |
| 3 | H0543 | UHC OF CALIFORNIA | HMO/HMOPOS | 64,566 | 2 | 12.3% |
| 4 | H8894 | Inland Empire Health Plan | HMO/HMOPOS | 38,327 | 2 | 7.3% |
| 5 | H3815 | ALIGNMENT HEALTH PLAN | HMO/HMOPOS | 29,203 | 2 | 5.6% |
| 6 | H8794 | KAISER FOUNDATION HP, INC. | HMO/HMOPOS | 15,633 | 2 | 3.0% |
| 7 | H5619 | ARCADIAN HEALTH PLAN, INC. | HMO/HMOPOS | 13,820 | 2 | 2.6% |
| 8 | H4161 | BLUE CROSS OF CALIFORNIA PARTNERSHIP PLAN, INC. | HMO/HMOPOS | 10,867 | 2 | 2.1% |
| 9 | H1993 | ASTIVA HEALTH, INC. | HMO/HMOPOS | 10,611 | 2 | 2.0% |
| 10 | H2001 | SIERRA HEALTH AND LIFE INSURANCE COMPANY, INC. | Local PPO | 9,182 | 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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