Any disputed questions of law or fact shall be determined as herein provided. Whenever any claimant misconceives his remedy and files an application for adjustment of claim under the Workers' Compensation Act and it is subsequently discovered, at any time before final disposition of such cause that the claim for injury or death which was the basis for such application should properly have been made under this Act, then the application so filed under the Workers' Compensation Act may be amended in form, substance or both to assert claim for such disability or death under this Act and it shall be deemed to have been so filed as amended on the date of the original filing thereof, and such compensation may be awarded as is warranted by the whole evidence pursuant to the provisions of this Act. When such amendment is submitted, further or additional evidence may be heard by the Arbitrator or Commission when deemed necessary; provided, that nothing in this Section contained shall be construed to be or permit a waiver of any provisions of this Act with reference to notice, but notice if given shall be deemed to be a notice under the provisions of this Act if given within the time required herein. The hearings before the Arbitrator shall be held in the vicinity where the last exposure occurred, after 10 days' notice of the time and place of such hearing shall have been given to each of the parties or their attorneys of record. The Arbitrator may find that the disabling condition is temporary and has not yet reached a permanent condition and may order the payment of compensation up to the date of the hearing, which award shall be reviewable and enforceable in the same manner as other awards, and in no instance be a bar to a further hearing and determination of a further amount of temporary total compensation or of compensation for permanent disability, but shall be conclusive as to all other questions except the nature and extent of such disability. The decision of the Arbitrator shall be filed with the Commission which Commission shall immediately send to each party or his attorney a copy of such decision, together with a notification of the time when it was filed. As of the effective date of this amendatory Act of the 94th General Assembly, all decisions of the Arbitrator shall set forth in writing findings of fact and conclusions of law, separately stated, if requested by either party. Unless a petition for review is filed by either party within 30 days after the receipt by such party of the copy of the decision and notification of time when filed, and unless such party petitioning for a review shall within 35 days after the receipt by him of the copy of the decision, file with the Commission either an agreed statement of the facts appearing upon the hearing before the Arbitrator, or if such party shall so elect a correct transcript of evidence of the proceedings at such hearings, then the decision shall become the decision of the Commission and in the absence of fraud shall be conclusive. The Petition for Review shall contain a statement of the petitioning party's specific exceptions to the decision of the arbitrator. The jurisdiction of the Commission to review the decision of the arbitrator shall not be limited to the exceptions stated in the Petition for Review. The Commission, or any member thereof, may grant further time not exceeding 30 days, in which to file such agreed statement or transcript of evidence. Such agreed statement of facts or correct transcript of evidence, as the case may be, shall be authenticated by the signatures of the parties or their attorneys, and in the event they do not agree as to the correctness of the transcript of evidence it shall be authenticated by the signature of the Arbitrator designated by the Commission. Whether the employee is working or not, if the employee is not receiving or has not received medical, surgical, or hospital services or other services or compensation as provided in paragraph (a) of Section 8 of the Workers' Compensation Act, or compensation as provided in paragraph (b) of Section 8 of the Workers' Compensation Act, the employee may at any time petition for an expedited hearing by an Arbitrator on the issue of whether or not he or she is entitled to receive payment of the services or compensation. Provided the employer continues to pay compensation pursuant to paragraph (b) of Section 8 of the Workers' Compensation Act, the employer may at any time petition for an expedited hearing on the issue of whether or not the employee is entitled to receive medical, surgical, or hospital services or other services or compensation as provided in paragraph (a) of Section 8 of the Workers' Compensation Act, or compensation as provided in paragraph (b) of Section 8 of the Workers' Compensation Act. When an employer has petitioned for an expedited hearing, the employer shall continue to pay compensation as provided in paragraph (b) of Section 8 of the Workers' Compensation Act unless the arbitrator renders a decision that the employee is not entitled to the benefits that are the subject of the expedited hearing or unless the employee's treating physician has released the employee to return to work at his or her regular job with the employer or the employee actually returns to work at any other job. If the arbitrator renders a decision that the employee is not entitled to the benefits that are the subject of the expedited hearing, a petition for review filed by the employee shall receive the same priority as if the employee had filed a petition for an expedited hearing by an arbitrator. Neither party shall be entitled to an expedited hearing when the employee has returned to work and the sole issue in dispute amounts to less than 12 weeks of unpaid compensation pursuant to paragraph (b) of Section 8 of the Workers' Compensation Act. Expedited hearings shall have priority over all other petitions and shall be heard by the Arbitrator and Commission with all convenient speed. Any party requesting an expedited hearing shall give notice of a request for an expedited hearing under this paragraph. A copy of the Application for Adjustment of Claim shall be attached to the notice. The Commission shall adopt rules and procedures under which the final decision of the Commission under this paragraph is filed not later than 180 days from the date that the Petition for Review is filed with the Commission. Where 2 or more insurance carriers, private self-insureds, or a group workers' compensation pool under Article V 3/4 of the Illinois Insurance Code dispute coverage for the same disease, any such insurance carrier, private self-insured, or group workers' compensation pool may request an expedited hearing pursuant to this paragraph to determine the issue of coverage, provided coverage is the only issue in dispute and all other issues are stipulated and agreed to and further provided that all compensation benefits including medical benefits pursuant to Section 8(a) of the Workers' Compensation Act continue to be paid to or on behalf of petitioner. Any insurance carrier, private self-insured, or group workers' compensation pool that is determined to be liable for coverage for the disease in issue shall reimburse any insurance carrier, private self-insured, or group workers' compensation pool that has paid benefits to or on behalf of petitioner for the disease. Such petition shall contain the following information and shall be served on the employer at least 15 days before it is filed: Fifteen days after receipt by the employer of the petition with the required information the employee may file said petition and required information and shall serve notice of the filing upon the employer. The employer may file a motion addressed to the sufficiency of the petition. If an objection has been filed to the sufficiency of the petition, the arbitrator shall rule on the objection within 2 working days. If such an objection is filed, the time for filing the final decision of the Commission as provided in this paragraph shall be tolled until the arbitrator has determined that the petition is sufficient. The employer shall, within 15 days after receipt of the notice that such petition is filed, file with the Commission and serve on the employee or his representative a written response to each claim set forth in the petition, including the legal and factual basis for each disputed allegation and the following information: (i) complete copies of any reports, records, documents and affidavits in the possession of the employer on which the employer intends to rely in support of his response, (ii) a list of any reports, records, documents and affidavits which the employer has demanded by subpoena and on which the employer intends to rely in support of his response, (iii) the name and address of each witness on whom the employer will rely to support his response, and (iv) the names and addresses of any medical practitioners selected by the employer pursuant to Section 12 of this Act and the time and place of any examination scheduled to be made pursuant to such Section. Any employer who does not timely file and serve a written response without good cause may not introduce any evidence to dispute any claim of the employee but may cross examine the employee or any witness brought by the employee and otherwise be heard. No document or other evidence not previously identified by either party with the petition or written response, or by any other means before the hearing, may be introduced into evidence without good cause. If, at the hearing, material information is discovered which was not previously disclosed, the Arbitrator may extend the time for closing proof on the motion of a party for a reasonable period of time which may be more than 30 days. No evidence may be introduced pursuant to this paragraph as to permanent disability. No award may be entered for permanent disability pursuant to this paragraph. Either party may introduce into evidence the testimony taken by deposition of any medical practitioner. The Commission shall adopt rules, regulations and procedures whereby the final decision of the Commission is filed not later than 90 days from the date the petition for review is filed but in no event later than 180 days from the date the petition for an emergency hearing is filed with the Illinois Workers' Compensation Commission. All service required pursuant to this paragraph (b-1) must be by personal service or by certified mail and with evidence of receipt. In addition, for the purposes of this paragraph, all service on the employer must be at the premises where the accident occurred if the premises are owned or operated by the employer. Otherwise service must be at the employee's principal place of employment by the employer. If service on the employer is not possible at either of the above, then service shall be at the employer's principal place of business. After initial service in each case, service shall be made on the employer's attorney or designated representative. The fees and payment thereof of all attorneys and physicians for services authorized by the Commission under this Act shall, upon request of either the employer or the employee or the beneficiary affected, be subject to the review and decision of the Commission. In the event either party requests oral argument, such argument shall be had before a panel of 3 members of the Commission (or before all available members pursuant to the determination of 7 members of the Commission that such argument be held before all available members of the Commission) pursuant to the rules and regulations of the Commission. A panel of 3 members, which shall be comprised of not more than one representative citizen of the employing class and not more than one representative from a labor organization recognized under the National Labor Relations Act or an attorney who has represented labor organizations or has represented employees in workers' compensation cases, shall hear the argument; provided that if all the issues in dispute are solely the nature and extent of the permanent partial disability, if any, a majority of the panel may deny the request for such argument and such argument shall not be held; and provided further that 7 members of the Commission may determine that the argument be held before all available members of the Commission. A decision of the Commission shall be approved by a majority of Commissioners present at such hearing if any; provided, if no such hearing is held, a decision of the Commission shall be approved by a majority of a panel of 3 members of the Commission as described in this Section. The Commission shall give 10 days' notice to the parties or their attorneys of the time and place of such taking of testimony and of such argument. In any case the Commission in its decision may in its discretion find specially upon any question or questions of law or facts which shall be submitted in writing by either party whether ultimate or otherwise; provided that on issues other than nature and extent of the disablement, if any, the Commission in its decision shall find specially upon any question or questions of law or fact, whether ultimate or otherwise, which are submitted in writing by either party; provided further that not more than 5 such questions may be submitted by either party. Any party may, within 20 days after receipt of notice of the Commission's decision, or within such further time, not exceeding 30 days, as the Commission may grant, file with the Commission either an agreed statement of the facts appearing upon the hearing, or, if such party shall so elect, a correct transcript of evidence of the additional proceedings presented before the Commission in which report the party may embody a correct statement of such other proceedings in the case as such party may desire to have reviewed, such statement of facts or transcript of evidence to be authenticated by the signature of the parties or their attorneys, and in the event that they do not agree, then the authentication of such transcript of evidence shall be by the signature of any member of the Commission. If a reporter does not for any reason furnish a transcript of the proceedings before the Arbitrator in any case for use on a hearing for review before the Commission, within the limitations of time as fixed in this Section, the Commission may, in its discretion, order a trial de novo before the Commission in such case upon application of either party. The applications for adjustment of claim and other documents in the nature of pleadings filed by either party, together with the decisions of the Arbitrator and of the Commission and the statement of facts or transcript of evidence hereinbefore provided for in paragraphs (b) and (c) shall be the record of the proceedings of the Commission, and shall be subject to review as hereinafter provided. At the request of either party or on its own motion, the Commission shall set forth in writing the reasons for the decision, including findings of fact and conclusions of law, separately stated. The Commission shall by rule adopt a format for written decisions for the Commission and arbitrators. The written decisions shall be concise and shall succinctly state the facts and reasons for the decision. The Commission may adopt in whole or in part, the decision of the arbitrator as the decision of the Commission. When the Commission does so adopt the decision of the arbitrator, it shall do so by order. Whenever the Commission adopts part of the arbitrator's decision, but not all, it shall include in the order the reasons for not adopting all of the arbitrator's decision. When a majority of a panel, after deliberation, has arrived at its decision, the decision shall be filed as provided in this Section without unnecessary delay, and without regard to the fact that a member of the panel has expressed an intention to dissent. Any member of the panel may file a dissent. Any dissent shall be filed no later than 10 days after the decision of the majority has been filed. Decisions rendered by the Commission after the effective date of this amendatory Act of 1980 and dissents, if any, shall be published together by the Commission. The conclusions of law set out in such decisions shall be regarded as precedents by arbitrators, for the purpose of achieving a more uniform administration of this Act. A proceeding for review shall be commenced within 20 days of the receipt of notice of the decision of the Commission. The summons shall be issued by the clerk of such court upon written request returnable on a designated return day, not less than 10 or more than 60 days from the date of issuance thereof, and the written request shall contain the last known address of other parties in interest and their attorneys of record who are to be served by summons. Service upon any member of the Commission or the Secretary or the Assistant Secretary thereof shall be service upon the Commission, and service upon other parties in interest and their attorneys of record shall be by summons, and such service shall be made upon the Commission and other parties in interest by mailing notices of the commencement of the proceedings and the return day of the summons to the office of the Commission and to the last known place of residence of other parties in interest or their attorney or attorneys of record. The clerk of the court issuing the summons shall on the day of issue mail notice of the commencement of the proceedings which shall be done by mailing a copy of the summons to the office of the Commission, and a copy of the summons to the other parties in interest or their attorney or attorneys of record and the clerk of the court shall make certificate that he has so sent such notices in pursuance of this Section, which shall be evidence of service on the Commission and other parties in interest. The Commission shall not be required to certify the record of their proceedings in the Circuit Court unless the party commencing the proceedings for review in the Circuit Court as above provided, shall file with the Commission notice of intent to file for review in Circuit Court. It shall be the duty of the Commission upon such filing of notice of intent to file for review in Circuit Court to prepare a true and correct copy of such testimony and a true and correct copy of all other matters contained in such record and certified to by the Secretary or Assistant Secretary thereof. The changes made to this subdivision (f)(1) by this amendatory Act of the 98th General Assembly apply to any Commission decision entered after the effective date of this amendatory Act of the 98th General Assembly. No request for a summons may be filed and no summons shall issue unless the party seeking to review the decision of the Commission shall exhibit to the clerk of the Circuit Court proof of filing with the Commission of the notice of the intent to file for review in the Circuit Court or an affidavit of the attorney setting forth that notice of intent to file for review in Circuit Court has been given in writing to the Secretary or Assistant Secretary of the Commission. The following shall not be required to file a bond to secure the payment of the award and the costs of the proceedings in the court to authorize the court to issue such summons: The court may confirm or set aside the decision of the Commission. If the decision is set aside and the facts found in the proceedings before the Commission are sufficient, the court may enter such decision as is justified by law, or may remand the cause to the Commission for further proceedings and may state the questions requiring further hearing, and give such other instructions as may be proper. Appeals shall be taken to the Appellate Court in accordance with Supreme Court Rules 22(g) and 303. Appeals shall be taken from the Appellate Court to the Supreme Court in accordance with Supreme Court Rule 315. It shall be the duty of the clerk of any court rendering a decision affecting or affirming an award of the Commission to promptly furnish the Commission with a copy of such decision, without charge. The decision of a majority of the members of the panel of the Commission, shall be considered the decision of the Commission. Judgment shall not be entered until 15 days' notice of the time and place of the application for the entry of judgment shall be served upon the employer by filing such notice with the Commission, which Commission shall, in case it has on file the address of the employer or the name and address of its agent upon whom notices may be served, immediately send a copy of the notice to the employer or such designated agent. However, as to disablements occurring subsequently to July 1, 1955, which are covered by any agreement or award under this Act providing for compensation in installments made as a result of such disablement, such agreement or award may at any time within 30 months after such agreement or award be reviewed by the Commission at the request of either the employer or the employee on the ground that the disability of the employee has subsequently recurred, increased, diminished or ended. On such review compensation payments may be re-established, increased, diminished or ended. The Commission shall give 15 days' notice to the parties of the hearing for review. Any employee, upon any petition for such review being filed by the employer, shall be entitled to one day's notice for each 100 miles necessary to be traveled by him in attending the hearing of the Commission upon the petition, and 3 days in addition thereto. Such employee shall, at the discretion of the Commission, also be entitled to 5 cents per mile necessarily traveled by him within the State of Illinois in attending such hearing, not to exceed a distance of 300 miles, to be taxed by the Commission as costs and deposited with the petition of the employer. When compensation which is payable in accordance with an award or settlement contract approved by the Commission, is ordered paid in a lump sum by the Commission, no review shall be had as in this paragraph mentioned. When determining whether this subsection (k) shall apply, the Commission shall consider whether an arbitrator has determined that the claim is not compensable or whether the employer has made payments under Section 8(j) of the Workers' Compensation Act. The insured employer may challenge, in proceeding before the Commission, payments made by the insurer without arbitration and payments made after a case is determined to be noncompensable. If the Commission finds that the case was not compensable, the insurer shall purge its records as to that employer of any loss or expense associated with the claim, reimburse the employer for attorneys fee arising from the challenge and for any payment required of the employer to the Rate Adjustment Fund or the Second Injury Fund, and may not effect the loss or expense for rate making purposes. The employee shall not be required to refund the challenged payment. The decision of the Commission may be reviewed in the same manner as in arbitrated cases. No challenge may be initiated under this paragraph more than 3 years after the payment is made. An employer may waive the right of challenge under this paragraph on a case by case basis.
820 ILCS 310/19