Tex. Gov't Code § 803.402

Except as provided by other law, records of members and beneficiaries of a retirement system to which this chapter applies that are in the custody of any retirement system to which this chapter applies are confidential and not subject to disclosure and are exempt from the public access provisions of Chapter 552. The records or information in the records may be transferred between retirement systems to which this chapter applies to the extent necessary to administer the proportionate retirement program provided by this chapter.