A Superbill itemizes all transactions (completed procedures, payments, adjustments) regarding rendered services within a date/date range.
A Superbill is intended to provide to the patient, which may be attached to an insurance claim that the patient personally submits to the insurance carrier for financial reimbursement.
Since a Superbill is related to insurance claims, the insurance billing provider which is indicated within setup/offices is used for the Superbill.