Lenders can use the data from your credit report to deny you credit for any one of several reasons. If you are denied, you receive a letter identifying the credit reporting agency that provided the report, along with a risk factor reason code. Bargaineering published a list of the common risk factor codes that lenders use to deem you unworthy of credit. For all three reporting agencies, the cardinal sins are owing too much and failing to pay your bills. The list of codes, inside.