10. Baptist Medical Center (San Antonio, Texas)

Number of individuals impacted: 1.24 million

This is a case of a health-care institution being targeted by hackers. In late June, San Antonio-based Baptist Medical Center and affiliate Resolute Health Hospital of New Braunfels, Texas experienced a major breach, apparently the result of a malware attack, according to published accounts.

The incident ranks as one of the largest breaches recently tracked by the U.S. Department of Health and Human Services, which now compiles reports on health-care breaches across the country. The breach, discovered in April, included unauthorized access to highly sensitive patient data.