Tennessee Code Title 56. Insurance § 56-7-3104

(a) Reimbursement by a pharmacy benefits manager under a contract to a pharmacist or pharmacy for prescription drugs and other products and supplies that is calculated according to a formula that uses a nationally recognized reference in the pricing calculation shall use the most current nationally recognized reference price or amount in the actual or constructive possession of the pharmacy benefits manager or its agent.

(b) For purposes of compliance with this section, pharmacy benefits managers shall be required to update the nationally recognized reference prices or amounts used for calculation of reimbursement for prescription drugs and other products and supplies no less than every three (3) business days.