There is a field call Claimstatus,
if the biller entered the claim and marked the claimstatus as HOLD
then you can run a report found here

REPORTS
MANAGEMENT REPORTS
TRANSACTION STATUS REPORTS

it will prompt for a range of entry dates (when claims were added) and a Claimstatus
the default is FILE but you can change it to HOLD

If the Claimstatus was not used, then I would recommend using this report (with FILE as claimstatus) and rebill based on Dates of service on the report.   Worst Case if its a duplicate billing payor will reject it