LOS ANGELES—California hospitals reported that during a 10-month period ending in May, doctors performed the wrong surgical procedure, operated on the wrong body part or on the wrong patient 41 times, records show.During the same period, hospitals reported that foreign objects were left in surgical patients 145 times.

These types of errors, officially called “adverse events,” are among the 1,002 cases of serious medical harm to patients disclosed by hospitals statewide, according to figures compiled by the California Department of Public Health. Under a new state law, hospitals must report to health officials all substantial injuries to their patients.

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