Rejection: Segment PER (Service Facility Contact Information) is used. It is not expected to be used when segment REF (Property and Casualty Claim Number) is not used. Segment PER is defined in the guideline at position 2750.What happened: The PER segment was sent in the facility loop.Resolution: The PER segment is referring to the phone number for the facility. The payer does not want this segment. Need to remove this from the billing software and reupload.