Texas Labor Code - LAB § 502.024. Preexisting Disqualifying Condition

(a) An institution may certify as an employee a person who indicates a preexisting disqualifying physical condition in a medical history obtained under Section 502.064 or who is found to have a preexisting disqualifying medical condition in a physical examination under Section 502.064 on the condition that the person execute in writing a waiver of coverage under this chapter for the preexisting disqualifying physical condition before becoming an employee of the institution.

(b) A waiver under Subsection (a) is valid and binding on the employee who executes the waiver.  Compensation or death benefits may not be paid to the employee or the employee's beneficiaries for an injury or death of the employee that is attributable to the condition for which coverage was waived.