Texas Insurance Code - INS § 1358.103. Limit on Cost-Sharing Requirement

(a) In this section, “insulin” means a prescription drug that contains insulin and is used to treat diabetes.  The term does not include an insulin drug that is administered to a patient intravenously.

(b) A health benefit plan may not impose a cost-sharing provision for insulin that is included in the health benefit plan's formulary if the total amount the enrollee is required to pay exceeds $25 per prescription for a 30-day supply, regardless of the amount or type of insulin needed to fill the enrollee's prescription.