Email Breach Affects 22,000 Ambulatory Surgery Center of Westchester Patients. The Mount Kisco Surgery Center, doing business as the Ambulatory Surgery Center of Westchester in New York, has recently notified 22,139 patients that An employee email account containing the PHI of 22,000 Ambulatory Surgery Center of Westchester patients has been hacked. Mobile Medical Response is investigating an impermissible disclosure of patient data. Suspicious activity was detected in an employee’s email account on November 3, 2023, and after securing the account, a forensic investigation was launched to determine the nature and scope of the activity. The investigation confirmed that the unauthorized third party had access to the account from October 23, 2023, to November 3, 2023, and that the account contained patient data. Third-party company: CBM Services.