The report can be found at the following link.
(From the summary)
VA’s Fee Basis Claims System from November 2014 through September 2016. The Veterans Health Administration’s (VHA’s) Office of Community Care (OCC) contracted with Third Party Administrators (TPAs) to process claims and pay Choice medical providers.
During the 23-month audit period, OIG sampled from a population of 2 million Choice claims. Of those claims, an estimated 224,000 were paid in error, and 1 million were processed in excess of the 30-day Prompt Payment Standard.