Medicare Advantage in San Francisco County, California
83,220 people in San Francisco County, California were enrolled in Medicare Advantage in October 2026, 51.8% of 160,723 eligible beneficiaries (+1.2 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 44% of reported enrollment; 18 parent organizations have 11 or more members and the HHI is 2,417 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 1,851 members here are in plans that terminate or leave the county, and Molina Healthcare, Inc., Health Plan of San Mateo leave. MA plans offered go from 29 to 25.
Parent organizations in San Francisco County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 36,793 | +838 | 44.3% |
| Elevance Health, Inc. | 12,964 | +3,930 | 15.6% |
| California Physicians' Service | 6,687 | +83 | 8.1% |
| SCAN Group | 5,952 | +3,811 | 7.2% |
| Chinese Hospital Association | 5,008 | −140 | 6.0% |
| UnitedHealth Group, Inc. | 4,401 | −586 | 5.3% |
| CVS Health Corporation | 2,506 | −1,146 | 3.0% |
| Centene Corporation | 2,418 | −5,343 | 2.9% |
| Alignment Healthcare USA, LLC | 2,224 | +515 | 2.7% |
| SAN FRANCISCO HEALTH AUTHORITY | 1,399 | new | 1.7% |
| On Lok, Inc. | 1,041 | +19 | 1.3% |
| Molina Healthcare, Inc. | 498 | −394 | 0.6% |
| Imperial Health Plan of California | 441 | +41 | 0.5% |
| Health Plan of San Mateo | 269 | −35 | 0.3% |
| North East Medical Services | 210 | +33 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 8,699 beneficiaries in San Francisco County were assigned to 137 Medicare Shared Savings Program ACOs, 18.9% of assignable Original Medicare beneficiaries. Together, roughly 61% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.