If you have an assigned provider representative with the carrier, they can sort this out for you. Otherwise, it seems most likely that you need to find out who you can send a W-9 to so that they can update their database. Claims are processed by a computer that might kick out a claim for any incorrect information fields (or data that doesn't match what is in their database). For instance if they have one address in a data field, and you are submitting a different one, yes that would most likely cause a claim to be kicked out.
"Our EDI Carrier has a rule that if the rendering provider name has to be striped at the clearing house and replace it with the Group NPI. The legal name has a dba."
Apologies, but I am not quite certain what you mean here. Are you saying your PM software is set up to enter the rendering physicians name in a field, but your clearing house requires an NPI? And that this is the cause of your OON claims? If so, this is an issue you need to take up with either the practice management software vendor, or the clearing house.