Iowa Admin. Code r. 495-14.7
A named beneficiary of a deceased member may waive current and future rights to payments to which the beneficiary would have been entitled. The waiver of the rights shall occur prior to the receipt of a payment from IPERS to the beneficiary. The waiver of rights shall be binding and will be executed on a form provided by IPERS. The waiver of rights may be general, in which case payment shall be divided equally among all remaining designated beneficiaries or, if there are none, to the member's estate. The waiver of rights may also expressly be made in favor of one or more of the member's designated beneficiaries or the member's estate. If the waiver of rights operates in favor of the member's estate and no estate is probated or claim made, or if the executor or administrator expressly waives payment to the estate, payment shall be paid to the member's surviving spouse imless there is no surviving spouse or the surviving spouse has waived the surviving spouse's rights. In that case, payment shall be made to the member's heirs excluding any person who waived the right to payment. Any waiver filed by an executor, administrator, or other fiduciary must be accompanied by a release acceptable to IPERS indemnifying IPERS from all liability to beneficiaries, heirs, or other claimants for any waiver executed by an executor, administrator, or other fiduciary.
Iowa Admin. Code r. 495-14.7