Sometimes the determination of whether a service is covered or not or whether prior authorization is required can't be determined until the performer of the service has been selected.  As well, payers may be able to provide information about whether a selected performer is considered in or out of network, provide estimated pricing information and other useful decision support guidance as part of the process for selecting where an active order should be performed.  There needs to be an ability to invoke CRD during this dispatch process - which occurs after the order is signed, and is quite often performed by someone other than the ordering provider.