Some insurance carriers have universal payer numbers, but often they will change from clearinghouse to clearinghouse. If you are changing clearinghouses you will need to redo the EDI paperwork because you will need Medicare to know where the claims are coming from and where to send the ERAs. Even if the payer ID is the same, the submitter number of the clearinghouse will be different. Go to the website of the new clearinghouse. They should have the EDI paperwork there, or at least a link to it, and instructions on completing it.