In looking for information on Foster I found this NYT article. It's a glowing piece attesting to the character of Foster. It reads more like a letter of recommendation.

From the Seattle Times:

...Thomas Scully, ordered him to withhold from lawmakers unfavorable cost estimates about the Medicare prescription-drug bill. He said the estimates exceeded what Congress seemed willing to accept by more than $100 billion

Richard Foster, chief actuary at the Centers for Medicare and Medicaid Services, said last night that he received a handwritten note from Scully, then the centers' administrator, in early June ordering him to ignore information requests from members of Congress who were drafting the drug bill.

Scully's note, according to Foster, "was a direct order not to respond to certain requests and instead to provide the responses to him and (to) warn about the consequences of insubordination."

Where is this note? Given Foster's reported attention to detail and diligence you would think he would still have it? It would give some weight to his accusations.