Iowa Code § 97B.25
A representative designated by the chief executive officer and referred to in this chapter as a retirement benefits officer shall promptly examine applications for retirement benefits and on the basis of facts found shall determine whether or not the claim is valid. If the claim is valid, the retirement benefits officer shall send a notification to the member stating the option the member has selected pursuant to section 97B.51, the month with respect to which benefits shall commence, and the monthly benefit amount payable. If the claim is invalid, the retirement benefits officer shall promptly notify the applicant and any other interested party of the decision and the reasons. A retirement application shall not be amended or revoked by the member once the first retirement allowance is paid. A member's death during the first month of entitlement shall not invalidate an approved application.
Iowa Code § 97B.25
86 Acts, ch 1245, §255; 88 Acts, ch 1109, §13; 92 Acts, ch 1201, §21; 94 Acts, ch 1023, §8; 94 Acts, ch 1183, §15; 96 Acts, ch 1187, §9; 98 Acts, ch 1183, §16; 2000 Acts, ch 1077, §27; 2001 Acts, ch 68, §15, 24