Final answer:
The BIN number on a prescription card is used for billing information; it helps insurance companies identify the patient's prescription drug plan for claim processing.
Step-by-step explanation:
The BIN number on a prescription card is crucial for the processing of prescription drug claims. It stands for Bank Identification Number and is used by the pharmacy to submit prescription drug claims to the patient's prescription drug plan for billing purposes. This number helps the insurance company identify which benefits should be applied to cover the cost of the prescription.
Therefore, the correct answer to the question, "What does the BIN number indicate on the prescription card?" is B) Billing information.