Two million people who sought care at more than 50 Shields Health Care Group partners across the New England region may have had their personal data exposed after the company's network server was breached in March.
The cyberattack occurred between March 7 and March 21 and was discovered March 28, the healthcare group said Tuesday.
The breach is the largest of the year in healthcare, according to the U.S. Department of Health and Human Services Office for Civil Rights' breach portal, surpassing the January breach of the North Broward Hospital District in Florida that affected more than 1.3 million people.