The Department of Justice has recovered more than $9.3 billion from drug companies and healthcare providers that tried to rip off state or federal agencies.

Whistle-blowers, who receive 15% to 25% of any amount recovered by the Department of Justice, how initiate 9 in 10 cases for the department. While the number of healthcare fraud cases has recently dropped, the average amount of recovery has risen, according to report authors Aaron Kesselheim of Brigham and Women’s Hospital and David Studdert of the University of Melbourne.

The researchers said they hoped to perform further research to learn what types of whistle-blower lawsuits are most likely to yield government recoveries. More than three-fourths of nursing home care in the United States is funded by government sources such as Medicaid and Medicare.