With code G, the check would have been made out to the receiving IRA (or at least the IRA custodian) for your benefit. Simply enter the Form 1099-R as received and answer No to the questions asking if it was rolled over to a Roth IRA. As VolvoGirl said, TurboTax will automatically include the gross amount on Form 1040 line 5a and exclude the amount from line 5b with the ROLLOVER notation.
