MA Enrollment Explorer / Parent organizations / SANTA CLARA COUNTY HEALTH AUTHORITY
SANTA CLARA COUNTY HEALTH AUTHORITY: Medicare Advantage enrollment and market share
SANTA CLARA COUNTY HEALTH AUTHORITY had 11,953 Medicare Advantage members in October 2026, #99 nationally with 0.03% of all MA enrollment. It gained 411 members (+3.6%) since October 2025, and has enrollment in 1 state and 10 counties with 11 or more members. In the 2026 Annual Election Period (December to February) it gained 72 members (+0.6%). For 2027, 0 of its members are in plans that terminate and 137 in plans leaving their county, and it leaves 9 counties entirely.
12KMA members, October 2026
+3.6%change since October 2025 (+411)
0.03%national MA share, rank 99
1contracts with enrollment
Largest states
| State | Members | Share of state MA |
|---|---|---|
| California | 11,885 | 0.3% |
Largest counties
| County | Members | Change since October 2025 | Share of county MA |
|---|---|---|---|
| Santa Clara County, CA | 11,748 | +430 | 7.3% |
| Alameda County, CA | 37 | −4 | 0.0% |
| Merced County, CA | 16 | +1 | 0.1% |
| San Benito County, CA | 15 | −1 | 0.9% |
| Santa Cruz County, CA | 13 | +2 | 0.1% |
| San Joaquin County, CA | 12 | −1 | 0.0% |
| Sacramento County, CA | 11 | new | 0.0% |
| Contra Costa County, CA | 11 | −2 | 0.0% |
| Stanislaus County, CA | 11 | 0 | 0.0% |
| San Mateo County, CA | 11 | −1 | 0.0% |
Contracts
| Contract | Plan type | Oct 2024 | Oct 2025 | Oct 2026 |
|---|---|---|---|---|
| H4045 Santa Clara Family Health Plan | HMO/HMOPOS | 10,729 | 11,542 | 11,953 |
Star ratings for these contracts are in the MA Quality Dashboard.