On March 17, 2023, the California Office of the Attorney General reported that the Health Plan of San Mateo (HPSM) experienced an email phishing incident on January 17, 2023, potentially involving the personal information of members. The breach involved unauthorized access to an employee email account, through which a spreadsheet containing member information, including names and member identification numbers, was present. However, there is no evidence that the unauthorized person viewed this information or that it will be misused.