215 ILCS 165/27
Health services plan corporations organized under this Act shall be operated and conducted not-for-profit and shall be governed by the provisions of the "General Not for Profit Corporation Act", approved July 17, 1943, as amended, to such extent as the same may be applicable and not inconsistent with this Act. Every corporation organized hereunder is declared to be a charitable and benevolent corporation, and all of its funds and property shall be exempt from every State, county, district, municipal and school tax or assessment, and all other taxes and license fees, from the payment of which charitable and benevolent corporations or institutions are now or may hereafter be exempt. This exemption shall not prevail against the fees and charges imposed by Sections 408 and 408.2 of the "Illinois Insurance Code", approved June 29, 1937, as amended.
215 ILCS 165/27