Michigan Compiled Laws, Chapter 550. General Insurance Laws § 550.1402b

Sec. 402b. (1) For an individual covered under a nongroup certificate or under a certificate not covered under subsection (2), a health care corporation may exclude or limit coverage for a condition only if the exclusion or limitation relates to a condition for which medical advice, diagnosis, care, or treatment was recommended or received within 6 months before enrollment and the exclusion or limitation does not extend for more than 6 months after the effective date of the certificate.

(2) A health care corporation shall not exclude or limit coverage for a preexisting condition for an individual covered under a group certificate.

(3) Notwithstanding subsection (1), a health care corporation shall not issue a certificate to a person eligible for nongroup coverage or eligible for a certificate not covered under subsection (2) that excludes or limits coverage for a preexisting condition or provides a waiting period if all of the following apply:

(4) As used in this section, “group” means a group of 2 or more subscribers.