Which item is essential for processing a prescription order in IRIS?

The member ID is essential for processing a prescription order in IRIS because it serves as a unique identifier for the individual receiving the medication. This ID allows the system to verify the member's eligibility for the prescription coverage, ensuring that the correct benefits and rules associated with that specific member are applied during the ordering process. It facilitates the accurate retrieval of the member's profile, which includes their prescription history, any restrictions or requirements, and relevant billing information. Without the member ID, it would be challenging to associate the order with the correct individual and provide the necessary service effectively.