The Health and Human Services Department began its tracking in 2010
| Individuals affected | Company | Date reported | Type of breach |
|---|---|---|---|
| 78,800,000 | Anthem | February 2015 | Hacking/IT incident |
| 11,500,000 | Optum360 | July 2019 | Hacking/IT incident |
| 11,270,000 | HCA Healthcare | July 2023 | Hacking/IT incident |
| 11,000,000 | Premera Blue Cross | March 2015 | Hacking/IT incident |
| 10,251,784 | LabCorp | July 2019 | Hacking/IT incident |
| 9,358,891 | Excellus Health Plan | September 2015 | Hacking/IT incident |
| 8,861,076 | Managed Care of North America | May 2023 | Hacking/IT incident |
| 6,121,158 | Community Health Systems Professional Services Corp. | August 2014 | Hacking/IT incident |
| 5,815,591 | PharMerica Corp. | May 2023 | Hacking/IT incident |
| 4,900,000 | Science Applications International Corp. | November 2011 | Other |