The health data of more than 15 million individuals was compromised after a hacker breached Massachusetts-based dental and vision benefits administrator DentaQuest this spring, according to a breach notice filed with federal regulators. It’s the largest health data breach reported to the government this year. DentaQuest, the second-largest dental benefits administrator in the U.S., has approximately 32 million beneficiaries across its dental and vision plans. The Health Information Sharing and Analysis Center — a global organization that facilitates information sharing among healthcare organizations — released a threat bulletin about ShinyHunters in July, warning that the group uses social engineering, such as phone calls, to trick people into sharing information and compromising accounts. Hacking has been the leading cause of healthcare data breaches reported to federal regulators since 2017.