Mich. Comp. Laws § 418.625
Each insurer mentioned in section 611 issuing an insurance policy covering worker's compensation in this state shall file with the director, within 30 days after the effective date of the policy, a notice of the issuance of the policy and its effective date. A notice of issuance of insurance, a notice of termination of insurance, or a notice of employer name change may be submitted in writing or by using agency-approved electronic filing and transaction standards and may be submitted by the insurer directly or by the compensation advisory organization of Michigan on behalf of the insurer. Payment shall not be required by the agency or any third party for the use of agency-approved electronic record layout and transaction standards under this act. Time requirements for notices under this act apply whether filed by the insurer or the compensation advisory organization of Michigan. If the policy covers persons who would otherwise be exempted from this act by section 115, the notice shall contain a specific statement to that effect. A notice is not required of any insurer if the policy issued is a renewal of the preceding policy. The insurer, if it refuses to accept any coverage under this act, shall do so in writing.
MCL 418.625