305 ILCS 5/5H-5
In the event of a merger, acquisition, or any similar transaction involving entities subject to the assessment under this Article, the resultant entity shall be responsible for the full amount of the assessment for all entities involved in the transaction with the member months allotted to tiers as they were prior to the transaction and no member months shall change tiers as a result of any transaction. A managed care organization that ceases doing business in the State during any fiscal year shall be liable only for the monthly installments due in months that it operated in the State. The Department shall by rule establish a methodology to set the assessment base member months for a managed care organization that begins operating in the State at any time after 2018. Nothing in this Section shall be construed to limit authority granted in subsection (c) of Section 5H-3.
305 ILCS 5/5H-5