ORANGE COUNTY, CA — A nationwide hospital safety analysis has found that Orange County hospitals grade ranges were from "A" to "C" for preventing medical errors, accidents, injuries and infections, which collectively are the third leading cause of death in America.

The Leapfrog Group released its bi-yearly hospital safety grades on Tuesday, finding that hospitals overall have improved in reducing the number of avoidable deaths. The group assessed roughly 2,500 hospitals. Of those, 30 percent earned an "A," 28 percent earned a "B," 35 percent a "C," 6 percent a "D" and 1 percent an "F." "The national numbers on death and harm in hospitals have alarmed us for decades. What we see in the new round of Safety Grades are signs of many hospitals making significant improvements in their patient safety record," Leah Binder, president and CEO of Leapfrog, said in a release.

The assessment system assigns school-style letter grades to general acute-care hospitals. The hope is to determine a patient's risk of further injury or infection if they visit a certain hospital. In Orange County, here is the full list of hospital grades:

Los Alamitos Medical Center, Los Alamitos: C La Palma Intercommunity Hospital, La Palma: A West Anaheim Medical Center, Anaheim: C AHMC Anahem Regional Medical Center, Anaheim: C St. Jude Medical Center, Fullerton: A Placentia-Linda Hospital, Placentia: B Kaiser Foundation Hospital, Orange County, Anaheim: A St. Joseph Hospital of Orange, Orange: A University of California Irvine, Orange: A Garden Grove Hospital and Medical Center, Garden Grove: B Fountain Valley Regional Hospital and Medical Center, Fountain Valley: B Orange Coast Memorial Medical Center, Fountain Valley: A Hoag Memorial Hospital Presbyterian, Newport Beach: A Saddleback Memorial Medical center of Laguna Hills, Laguna Hills: A Mission Hospital Regional Medical Center, Mission Viejo: B Mission Hospital Laguna Beach, Laguna Beach: B Among the findings nationally, five hospitals that received an "A" grade for the first time this year previously received an "F" grade, the group said, and 46 hospitals earned an "A" for the first time since the grading system began six years ago. Leapfrog said its analysis showed 89 hospitals that had previously received "D" or "F" ratings had improved to an "A" this year.

Rhode Island, Hawaii, Wisconsin and Idaho all previously ranked near the bottom of the state rankings with low percentages of "A" hospitals, but now all rank in the top 10.

Here are some of the other findings:

The five states with the highest percentage of "A" hospitals this spring are Hawaii, Idaho, Rhode Island, Massachusetts and Virginia

Ten states have hospitals with "F" grades are California, the District of Columbia, Florida, Iowa, Illinois, Maryland, Michigan, Mississippi, New Jersey and New York Leapfrog says you shouldn't refuse emergency care because of a bad safety grade. They're meant to be used as a guide for planned events and a research tool for potential emergencies. Patch reporters Dan Hampton and Feroze Dhanoa contributed to this report.