Hackers may have accessed medical and personal information of Partners HealthCare patients.
The Boston Globe is reporting about 3,300 people are affected.
The breach happened when some Partners employees responded to phishing e-mails.
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Responding to the phishing emails created an opportunity for unauthorized access to the workforce members' email accounts within the Partners HealthCare network.
Partners says some of the emails contained patient demographic information, such as names, addresses, dates of birth, telephone numbers, and, in some instances, Social Security numbers, and some patients' clinical information, such as diagnosis, treatment received, medical record numbers, medical diagnosis codes, or health insurance information.
The people affected by the breach include patients of Brigham and Women's Hospital, Massachusetts General Hospital, North Shore Medical Center, Partners Continuing Care, and Newton-Wellesley Hospital.
If you believe you have been affected but do not receive a letter by May 21, please call 1-877-237-9502. Be prepared to provide the following ten digit reference number when calling: 3844042415.