The Vermont Office of the Attorney General reported a data breach involving Massachusetts General Hospital (MGH) on February 21, 2024. The breach, discovered on December 12, 2023, involved the incorrect association of a patient's health document with another patient's record, potentially exposing demographic and clinical information. The number of individuals affected is not specified.

Massachusetts General Hospital notified 10,000 patients that their personal health information have been exposed to a data breach. An unauthorized third party gained access to two computer programs used by researchers in the hospital’s neurology department, the organization stated. Massachusetts General Hospital took immediate steps to secure the programs. Patient data that may have been affected included names, dates of birth, medical record numbers, and medical histories. No Social Security numbers or financial information were affected.