A pharmacy benefit manager that provides pharmacy benefit management for a health plan shall discharge its duties with reasonable care and diligence and be fair and truthful under the circumstances then prevailing that a pharmacy benefit manager acting in like capacity and familiar with such matters would use in the conduct of an enterprise of a like character and with like aims. In the case of a health benefit plan offered by a health insurer as defined by subdivision 9471(2)(A) of this title, the health insurer shall remain responsible for administering the health benefit plan in accordance with the health insurance policy or subscriber contract or plan and in compliance with all applicable provisions of Title 8 and this title.