Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.3553

Sec. 3553.(1) To obtain or maintain a certificate of authority in this state, a health maintenance organization shall possess and maintain a deposit in an amount determined adequate by the director to continue to comply with section 403  1 but not less than $100,000.00 plus 5% of annual subscription revenue up to a $1,000,000.00 maximum deposit.

(2) A health maintenance organization shall make the deposit required under subsection (1) with the state treasurer or with a federal or state chartered financial institution under a trust indenture acceptable to the director for the sole benefit of the subscribers and enrollees in case of insolvency.