Dominican Hospital in Santa Cruz, Community Hospital of the Monterey Penninsula in Monterey, Natividad Medical Center and Salinas Valley Memorial Healthcare System in Salinas has been given a grade of A. Watsonville Community Hospital received a B, making them five of highest rated hospitals in California. The Leapfrog Group, a nonprofit founded by employers and health care providers, ranked nearly 300 California hospitals with grades of A through F. Leapfrog looks at things like infections, medical errors, and accidents to help a patient determine which hospital to visit.