Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.3406ii

Sec. 3406ii. (1) An insurer that delivers, issues for delivery, or renews in this state a health insurance policy shall not limit or exclude coverage for an individual by imposing a preexisting condition exclusion on the individual.

(2) This section does not apply to any of the following:

(3) As used in this section, “preexisting condition exclusion” means a limitation or exclusion of benefits or a denial of coverage based on the fact that a physical or mental condition was present before the effective date of coverage or before the date coverage is denied, whether or not any medical advice, diagnosis, care, or treatment was recommended or received for the condition before the date of coverage or denial of coverage.