215 ILCS 5/466
The Director shall promulgate reasonable rules and shall approve statistical plans, reasonably adapted to each of the rating systems on file with him, which may be modified from time to time and which shall be used thereafter by each company in the recording and reporting of its loss and countrywide expense experience, in order that the experience of all companies may be made available at least annually in such form and detail as may be necessary to aid him in determining whether rating systems comply with the standards set forth in Section 456. An approved statistical plan need not be adopted as a rule, but shall be made available for public inspection at the Department's principal office and a copy of the plan shall be filed with the Secretary of State. Such rules and plans may also provide for the recording and reporting of expense experience items which are specially applicable to this state and are not susceptible of determination by a prorating of countrywide expense experience. In promulgating such rules and approving plans, the Director shall give due consideration to the rating systems on file with him and in order that such rules and plans may be as uniform as is practicable among the several states, to the rules and to the form of the plans used for such rating systems in other states. No company shall be required to record or report any experience on an experience classification which it does not use in the making of its rates or to record or report its experience on any basis or statistical plan that differs from that which is regularly employed and used in the usual course of such company's business, nor shall any company be required to record or report its loss experience on a classification basis that is inconsistent with the rating system filed by it, nor shall it be required to report such experience to any rating organization of which it is not a member or subscriber, or to an agency operated by or subject to the control of such a rating organization, nor shall the Department's rules state that the insurer must record or report its experience in accordance with a uniform statistical plan which differs from that which is regularly employed and used in the usual course of such company's business. Any company not reporting such experience to a rating organization or other agency designated by the Director, shall report such experience to the Director. The Director may designate one or more rating organizations or other agencies to assist him in gathering all such experience and in making compilations thereof. The experience of any company filed with the Director shall be deemed confidential and shall not be revealed by the Director to any other company or other person, provided, however, that the Director may make compilations of all experience, including the experience of any such company, or of such experience and the compilation made by the designated rating organization or other agency. All such compilations, whether made by the Director or by any designated rating organization or other agency, shall be made available, subject to reasonable rules promulgated by the Director, to companies and rating organizations.
Reasonable rules and plans may be promulgated by the Director for the interchange of data necessary for the application of rating plans.
In order to further uniform administration of rate regulatory laws, the Director and every company and rating organization may exchange information and experience data with insurance supervisory officials, companies and rating organizations in other states and may consult with them with respect to rate making and the application of rating systems.
The Director may make reasonable rules and regulations necessary to effect the purpose of this Article.
215 ILCS 5/466