All benefit payments, contributions of employees and annuitants, and optional benefit payments, any rights, benefits, or payments accruing to a person under this chapter, and all money in a fund created by this chapter:
(1) are exempt from execution, attachment, garnishment, or any other process; and
(2) may not be assigned, except:
(A) for direct payment that a participant may assign to a provider of health care services; and
(B) as specifically provided by this chapter.