Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.2218

(1) No misrepresentation shall avoid any contract of insurance or defeat recovery thereunder unless the misrepresentation was material. No misrepresentation shall be deemed material unless knowledge by the insurer of the facts misrepresented would have led to a refusal by the insurer to make the contract.

(2) A representation is a statement as to past or present fact, made to the insurer by or by the authority of the applicant for insurance or the prospective insured, at or before the making of the insurance contract as an inducement to the making thereof. A misrepresentation is a false representation, and the facts misrepresented are those facts which make the representation false.

(3) In determining the question of materiality, evidence of the practice of the insurer which made the contract with respect to the acceptance or rejection of similar risks shall be admissible.

(4) A misrepresentation that an applicant for life, accident or health insurance has not had previous medical treatment, consultation or observation, or has not had previous treatment or care in a hospital or other like institution, shall be deemed, for the purpose of determining its materiality, a misrepresentation that the applicant has not had the disease, ailment or other medical impairment for which such treatment or care was given or which was discovered by any licensed medical practitioner as a result of such consultation or observation. If in any action to rescind any contract or to recover thereon, any misrepresentation is proved by the insurer, and the insured or any other person having or claiming a right under the contract, shall prevent full disclosure and proof of the nature of the medical impairment, the misrepresentation shall be presumed to have been material.