| Kaiser Foundation Hospital - Redwood City | Redwood City, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital - Roseville | Roseville, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital - Sacramento | Sacramento, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital - San Diego | San Diego, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital - San Francisco | San Francisco, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital - San Leandro | San Leandro, CA | Acute Care Hospitals | Voluntary non-profit - Private | 2 stars |
| Kaiser Foundation Hospital - San Marcos | San Marcos, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital - South Bay | Harbor City, CA | Acute Care Hospitals | Voluntary non-profit - Other | 3 stars |
| Kaiser Foundation Hospital - South San Francisco | South San Francisco, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital - Vacaville | Vacaville, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital - Walnut Creek | Walnut Creek, CA | Acute Care Hospitals | Voluntary non-profit - Private | 3 stars |
| Kaiser Foundation Hospital - West la | Los Angeles, CA | Acute Care Hospitals | Voluntary non-profit - Private | 3 stars |
| Kaiser Foundation Hospital - Woodland Hills | Woodland Hills, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital and Rehab Center | Vallejo, CA | Acute Care Hospitals | Voluntary non-profit - Private | 2 stars |
| Kaiser Foundation Hospital Fontana/Ontario | Fontana, CA | Acute Care Hospitals | Voluntary non-profit - Private | 3 stars |
| Kaiser Foundation Hospital Manteca | Manteca, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital, Riverside | Riverside, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital-Moreno Valley | Moreno Valley, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Kaiser Foundation Hospital-San Jose | San Jose, CA | Acute Care Hospitals | Voluntary non-profit - Private | 3 stars |
| Kaiser Foundation Hospital-Santa Clara | Santa Clara, CA | Acute Care Hospitals | Voluntary non-profit - Private | 2 stars |
| Kaiser Foundation Hospital-Santa Rosa | Santa Rosa, CA | Acute Care Hospitals | Voluntary non-profit - Private | 3 stars |
| Kaiser Permanente Psychiatric Health Facility-Sant | Santa Clara, CA | Psychiatric | Proprietary | Not rated |
| Kaweah Health Medical Center | Visalia, CA | Acute Care Hospitals | Government - Hospital District or Authority | 3 stars |
| Keck Hospital of USC | Los Angeles, CA | Acute Care Hospitals | Voluntary non-profit - Other | 5 stars |
| Kern Medical Center | Bakersfield, CA | Acute Care Hospitals | Government - Hospital District or Authority | 1 star |
| Kern Valley Healthcare District | Lake Isabella, CA | Critical Access Hospitals | Government - Hospital District or Authority | 3 stars |
| L A Downtown Medical Center | Los Angeles, CA | Acute Care Hospitals | Proprietary | 3 stars |
| La Palma Intercommunity Hospital | La Palma, CA | Acute Care Hospitals | Proprietary | 3 stars |
| Lac/Harbor-UCLA Med Center | Torrance, CA | Acute Care Hospitals | Government - Local | 1 star |
| Lac/Olive View-UCLA Medical Center | Sylmar, CA | Acute Care Hospitals | Voluntary non-profit - Other | 2 stars |
| Lac/Rancho los Amigos National Rehabilitation Ctr | Downey, CA | Acute Care Hospitals | Government - Local | 3 stars |
| Laguna Honda Hospital & Rehabilitation Center | San Francisco, CA | Acute Care Hospitals | Government - Local | Not rated |
| Loma Linda University Children's Hospital | Loma Linda, CA | Acute Care Hospitals | Voluntary non-profit - Church | 3 stars |
| Loma Linda University Medical Center | Loma Linda, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Loma Linda University Medical Center-Murrieta | Murrieta, CA | Acute Care Hospitals | Voluntary non-profit - Private | 2 stars |
| Loma Linda VA Medical Center | Loma Linda, CA | Acute Care - Veterans Administration | Veterans Health Administration | 3 stars |
| Lompoc Valley Medical Center | Lompoc, CA | Acute Care Hospitals | Government - Hospital District or Authority | 1 star |
| Los Angeles Community Hospital | Los Angeles, CA | Acute Care Hospitals | Proprietary | 3 stars |
| Los Angeles General Medical Center | Los Angeles, CA | Acute Care Hospitals | Government - Local | 2 stars |
| Los Robles Hospital & Medical Center | Thousand Oaks, CA | Acute Care Hospitals | Proprietary | 4 stars |
| Lucile Salter Packard Children's Hsp at Stanford | Palo Alto, CA | Childrens | Voluntary non-profit - Private | Not rated |
| Mad River Community Hospital | Arcata, CA | Acute Care Hospitals | Proprietary | 1 star |
| Madera Community Hospital | Madera, CA | Acute Care Hospitals | Voluntary non-profit - Private | Not rated |
| Mammoth Hospital | Mammoth Lakes, CA | Critical Access Hospitals | Government - Hospital District or Authority | Not rated |
| Marian Regional Medical Center | Santa Maria, CA | Acute Care Hospitals | Voluntary non-profit - Church | 3 stars |
| Marinhealth Medical Center | Greenbrae, CA | Acute Care Hospitals | Government - Hospital District or Authority | 5 stars |
| Mark Twain Medical Center | San Andreas, CA | Critical Access Hospitals | Voluntary non-profit - Other | 3 stars |
| Marshall Medical Center | Placerville, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Martin Luther King, Jr. Community Hospital | Los Angeles, CA | Acute Care Hospitals | Voluntary non-profit - Private | 4 stars |
| Mayers Memorial Hospital | Fall River Mills, CA | Critical Access Hospitals | Government - Hospital District or Authority | Not rated |