PHARMACY BENEFIT MANAGERS: (1) Establishes requirements for pharmacy benefit managers and maximum allowable cost, including the ability of pharmacies to receive comprehensive maximum allowable cost lists and bring complaints, within the purview of the Department of Commerce and Consumer Affairs, clarifies the available penalties for violations of maximum allowable cost requirements.  (2) Requires pharmacy benefit managers to disclose where an equivalent drug can be obtained at or below the maximum allowable cost when a maximum allowable cost is upheld on appeal;  (3) Allows contracting pharmacies to reverse and rebill claims if the pharmacy benefit manager establishes a maximum allowable cost that is denied on appeal; provided that the pharmacy benefit manager shall pay the difference to the contracting pharmacies; and (4) Prohibits a pharmacy benefit manager from penalizing a contracting pharmacy for disclosing information related to an insurance cost-share for a prescription drug or selling a lower-priced drug.