This chapter applies only to a health benefit plan that provides benefits for medical or surgical expenses incurred as a result of a health condition, accident, or sickness, including an individual, group, blanket, or franchise insurance policy or insurance agreement, a group hospital service contract, or an individual or group evidence of coverage or similar coverage document that is offered or administered by:
(1) the Teacher Retirement System of Texas under Chapter 1575 or 1579; or
(2) the Employees Retirement System of Texas under Chapter 1551.