Tex. Lab. Code § 413.0141

The commissioner may by rule provide that an insurance carrier shall provide for payment of specified pharmaceutical services sufficient for the first seven days following the date of injury if the health care provider requests and receives verification of insurance coverage and a verbal confirmation of an injury from the employer or from the insurance carrier as provided by Section 413.014. The rules adopted by the commissioner shall provide that an insurance carrier is eligible for reimbursement for pharmaceutical services paid under this section from the subsequent injury fund in the event the injury is determined not to be compensable.