This class represents the billable aspects of a pharmacy dispense. It serves to link the clinical data related to a dispense to the administrative data needed to bill for the dispense. As a sub-type of Billable Service, it inherits all of the data related to billing and Coodination Of Benefits, adds some data elements specifically needed to bill for the pharmacy dispense, and points to the Pharmacy Dispense clinical data for any remaining data needed for billing. Note that this class also points to Professional Service Provision to handle any professional servies charges related to the dispense, such as patient counseling. Note that this class contains some properties that are clearly billing oriented, which are modeled here rather than in Billable Service, because they're only needed for the billing of Drug Provision.