Medicare Advantage in Stanislaus County, California
57,288 people in Stanislaus County, California were enrolled in Medicare Advantage in October 2026, 58.9% of 97,232 eligible beneficiaries (+0.2 pts since October 2025). Alignment Healthcare USA, LLC is the largest parent organization with 32% of reported enrollment; 15 parent organizations have 11 or more members and the HHI is 2,258 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 429 members here are in plans that terminate or leave the county, and Molina Healthcare, Inc., SANTA CLARA COUNTY HEALTH AUTHORITY leave. MA plans offered go from 21 to 21.
Parent organizations in Stanislaus County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Alignment Healthcare USA, LLC | 18,305 | +760 | 32.0% |
| Kaiser Foundation Health Plan, Inc. | 17,594 | +927 | 30.8% |
| SCAN Group | 7,534 | +6,639 | 13.2% |
| Imperial Health Plan of California | 4,585 | +2,344 | 8.0% |
| Humana Inc. | 2,518 | −1,238 | 4.4% |
| Centene Corporation | 2,136 | +360 | 3.7% |
| UnitedHealth Group, Inc. | 1,858 | −7,371 | 3.2% |
| Elevance Health, Inc. | 798 | −104 | 1.4% |
| California Physicians' Service | 777 | −517 | 1.4% |
| WelbeHealth LLC. | 425 | +99 | 0.7% |
| Golden Valley Health Centers | 285 | +31 | 0.5% |
| SAN JOAQUIN COUNTY HEALTH COMMISSION | 182 | new | 0.3% |
| CVS Health Corporation | 86 | −553 | 0.2% |
| Molina Healthcare, Inc. | 83 | −47 | 0.1% |
| SANTA CLARA COUNTY HEALTH AUTHORITY | 11 | 0 | under 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 10,216 beneficiaries in Stanislaus County were assigned to 83 Medicare Shared Savings Program ACOs, 37.5% of assignable Original Medicare beneficiaries. Together, roughly 74% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.