Texas Insurance Code - INS § 1369.607. Delivery of Drugs

(a) Except in a case in which the health benefit plan issuer or pharmacy benefit manager makes a credible allegation of fraud against the pharmacist or pharmacy and provides reasonable notice of the allegation and the basis of the allegation to the pharmacist or pharmacy, a health benefit plan issuer or pharmacy benefit manager may not as a condition of a contract with a pharmacist or pharmacy prohibit the pharmacist or pharmacy from:

(b) A pharmacist or pharmacy may not charge a health benefit plan issuer or pharmacy benefit manager for the delivery of a prescription drug as described by this section unless the charge is specifically agreed to by the health benefit plan issuer or pharmacy benefit manager.