The Code Book's author, holder of a Ph.

FORBES: I've got a secret

The credit bureaus resolve some disputes in house, but most are assigned a code that is sent to the debt holder, sometimes with a brief explanation.

WSJ: Getting Going: How to Fix a Credit-Report Error

Mr. Holder said the Justice probe would include a review of "a variety of statutes within the IRS code" and the federal criminal code.

WSJ: FBI Launches Probe of IRS