Ill. Admin. Code tit. 50, § 920.30
b) Upon a date of death notice of an insured, the insurer shall:
d) Minimum standards for good faith efforts to locate a beneficiary or beneficiaries under Section 15(a)(1) of the Act consist of the following:
3) If the contact attempts under subsection (d)(2) yield no response, or if the postal address is confirmed not to be current, then the insurer shall search for the most current postal address, telephone number, and e-mail address of the beneficiary or beneficiaries by all of the following means:
B) For the most current postal address, telephone number, and e-mail address, the insurer shall search external sources of records as follows:
4) Insurer Contacts
A) Using the most current contact information obtained from the search under subsection (d)(3), until either the insurer receives a response or all contact attempts have been exhausted without a response, the insurer shall attempt to contact the beneficiary or beneficiaries, in whatever order the insurer deems appropriate:
7) A beneficiary's postal address, telephone number, or e-mail address is confirmed not to be current: