Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.4734

Sec. 4734. (1) Information and testimony submitted or furnished to the office pursuant to this chapter, examination reports, preliminary examination reports or results, and the office's work papers, correspondence, memoranda, reports, records, and other written or oral information related to an examination report or an investigation shall be confidential, shall be withheld from public inspection, shall not be subject to subpoena, and shall not be divulged to any person, except as provided in this section or with the written consent of the company. If assurances are provided that the information will be kept confidential, the commissioner may disclose confidential work papers, correspondence, memoranda, reports, records, or other information as follows:

(2) The confidentiality requirements of subsection (1) do not apply in any proceeding or action brought against or by the insurer under this act or any other applicable act of this state, any other state, or the United States.