The US Federal Dept of Justice has;
Medicare Fraud Strike Force Charges 107 Individuals for Approximately $452 Million in False Billing
which provides Court Documents for those wishing more:
USDOJ: OPA: Documents and Resources from the May 2, 2012, Medicare Fraud Strike Force Press Conference
So if you want to know what it is the DOJ considered chargeable in this affair, there you go.
Thank You US Department of Justice