Medicare Advantage in San Luis Obispo County, California
17,865 people in San Luis Obispo County, California were enrolled in Medicare Advantage in October 2026, 23.9% of 74,786 eligible beneficiaries (−0.5 pts since October 2025). Alignment Healthcare USA, LLC is the largest parent organization with 32% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 1,899 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 2,316 members here are in plans that terminate or leave the county, and CVS Health Corporation, Kaiser Foundation Health Plan, Inc. leave. MA plans offered go from 10 to 8.
Parent organizations in San Luis Obispo County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Alignment Healthcare USA, LLC | 5,677 | +652 | 31.9% |
| CVS Health Corporation | 2,767 | +733 | 15.6% |
| UnitedHealth Group, Inc. | 2,682 | −2,539 | 15.1% |
| Humana Inc. | 2,647 | −66 | 14.9% |
| California Physicians' Service | 2,153 | +596 | 12.1% |
| Elevance Health, Inc. | 973 | +13 | 5.5% |
| Imperial Health Plan of California | 523 | +412 | 2.9% |
| SANTA BARBARA SAN LUIS OBISPO REGIONAL HEALTH AUTH | 214 | new | 1.2% |
| Kaiser Foundation Health Plan, Inc. | 76 | −14 | 0.4% |
| SCAN Group | 29 | +11 | 0.2% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 22 | −2 | 0.1% |
| Health Care Service Corporation | 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, 21,619 beneficiaries in San Luis Obispo County were assigned to 116 Medicare Shared Savings Program ACOs, 50.2% of assignable Original Medicare beneficiaries. Together, roughly 62% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.