PAYMENT OF BILLS FOR PHARMACEUTICAL SERVICES: If an employer shall have notified the pharmacist in writing, as provided in subdivision one of this section, why the bill has not been paid, in part or in full, and the pharmacist expressly so requests, the value and liability shall be decided by a single arbitrator process, pursuant to rules promulgated by the chair. The chair shall appoint a pharmacist in good standing licensed to practice in New York state to determine the value and liability of such disputed bill. Decisions rendered under the administrative resolution procedure shall be conclusive upon the parties as to the value and liability of the prescription in dispute.