Medicare Advantage in San Diego County, California
338,551 people in San Diego County, California were enrolled in Medicare Advantage in October 2026, 53.6% of 631,070 eligible beneficiaries (−0.5 pts since October 2025). Kaiser Foundation Health Plan, Inc. is the largest parent organization with 34% of reported enrollment; 24 parent organizations have 11 or more members and the HHI is 1,766 (moderately concentrated). HRSA classifies the county as partly rural. For 2027, 38,150 members here are in plans that terminate or leave the county, and Sharp Healthcare leaves. MA plans offered go from 60 to 46.
Parent organizations in San Diego County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Kaiser Foundation Health Plan, Inc. | 113,497 | +3,097 | 33.6% |
| UnitedHealth Group, Inc. | 68,703 | −4,431 | 20.3% |
| SCAN Group | 29,510 | +5,624 | 8.7% |
| Alignment Healthcare USA, LLC | 21,078 | +2,410 | 6.2% |
| Sharp Healthcare | 19,782 | +2,438 | 5.9% |
| Molina Healthcare, Inc. | 15,061 | −1,828 | 4.5% |
| California Physicians' Service | 12,624 | −578 | 3.7% |
| Humana Inc. | 11,158 | −3,748 | 3.3% |
| Community Health Group | 10,784 | +1,490 | 3.2% |
| CVS Health Corporation | 10,347 | −2,566 | 3.1% |
| Astiva Health Holdings Incorporated | 7,356 | +4,228 | 2.2% |
| Elevance Health, Inc. | 6,612 | −837 | 2.0% |
| Centene Corporation | 3,156 | −1,104 | 0.9% |
| Centro de Salud de la Comunidad de San Ysidro | 2,465 | +150 | 0.7% |
| Clever Care Health Plan, Inc. | 1,884 | +1,048 | 0.6% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 61,515 beneficiaries in San Diego County were assigned to 298 Medicare Shared Savings Program ACOs, 35.9% of assignable Original Medicare beneficiaries. Together, roughly 70% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.