House Energy and Commerce Committee leaders want to know why contractors hired by the Centers for Medicare and Medicaid Services (CMS) to track down waste and fraud find so little in a system known for decades to be shot through with double billings, over-payments and other forms of corrupt, inefficient spending.

They would also like to why CMS officials act on so few of the waste and fraud referrals they get from a trio of the top out-sourced sleuths.