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Top MA Enrollment Contracts in Washington (Feb 2026)
This page summarizes county-level Medicare Advantage enrollment by contract in Washington.
Home / Data Tools / MA Enrollment / MA State Rankings / Washington
Data source: SCC Enrollment MA Alternative File (2026-02). State total enrollment shown: 780,464.
Top 10 Contracts
| Rank | Contract ID | Organization Name | Plan Type | Enrolled | Counties | State Share |
|---|---|---|---|---|---|---|
| 1 | H3805 | UnitedHealthcare Benefits of Texas, Inc. | HMO/HMOPOS | 186,419 | 20 | 23.9% |
| 2 | H2001 | SIERRA HEALTH AND LIFE INSURANCE COMPANY, INC. | Local PPO | 106,664 | 39 | 13.7% |
| 3 | H5050 | KAISER FOUNDATION HEALTH PLAN OF WASHINGTON | HMO/HMOPOS | 98,647 | 12 | 12.6% |
| 4 | H5619 | ARCADIAN HEALTH PLAN, INC. | HMO/HMOPOS | 63,362 | 33 | 8.1% |
| 5 | H5008 | CARE IMPROVEMENT PLUS SOUTH CENTRAL INSURANCE CO. | HMO/HMOPOS | 40,862 | 30 | 5.2% |
| 6 | H5216 | HUMANA INSURANCE COMPANY | Local PPO | 35,681 | 38 | 4.6% |
| 7 | H0029 | COORDINATED CARE OF WASHINGTON, INC. | HMO/HMOPOS | 32,272 | 36 | 4.1% |
| 8 | H9003 | KAISER FOUNDATION HP OF THE N W | HMO/HMOPOS | 29,849 | 5 | 3.8% |
| 9 | H5521 | AETNA LIFE INSURANCE COMPANY | Local PPO | 26,951 | 7 | 3.5% |
| 10 | H1036 | HUMANA MEDICAL PLAN, INC. | HMO/HMOPOS | 23,202 | 27 | 3.0% |
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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