ILCS » Chapter 740 · Act 110
Illinois Compiled Statutes

740 ILCS 110/1 (2026)

This Act shall be known and may be cited as the "Mental Health and Developmental Disabilities Confidentiality Act"

✓ current as of May 2026
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(740 ILCS 110/1) (from Ch. 91 1/2, par. 801)
    Sec. 1. This Act shall be known and may be cited as the "Mental Health and Developmental Disabilities Confidentiality Act".
(Source: P.A. 80-1508.)

    
Notes of Decisions
Cited in 134 cases (15 in the last 5 years), 1993–2026 · leading case: Norskog v. Pfiel, 755 N.E.2d 1 (Ill. 2001).
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Norskog v. Pfiel, 755 N.E.2d 1 (Ill. 2001). · cites it 4× “We allowed amicus briefs in support of the defendants to be filed by the Mental Health Association in Illinois and, collectively, by Bazelon Center for Mental Health Law, Equip for Equality, Inc.”
Giangiulio v. Ingalls Mem'l Hosp., 850 N.E.2d 249 (Ill. App. Ct. 2006). · cites it 4× “Ingalls argues that the information and the object sought to be discovered by the plaintiff were protected from disclosure by the physician-patient privilege (735 ILCS 5/8 — 802 (West 2002)), the Mental Health and Developmental Disabilities Confidentiality Act (Confidentiality…”
Brucker v. Mercola, 886 N.E.2d 306 (Ill. 2007). · cites it 2× “801 through 817 (now 740 ILCS 110/1 et seq. (West 2006))) by revealing confidential information to the plaintiff's wife after the plaintiff had asked the doctor not to reveal the information.”
Johnston v. Weil, 946 N.E.2d 329 (Ill. 2011). · cites it 4× “Amabile's report was privileged under the Mental Health and Developmental Disabilities Confidentiality Act (Confidentiality Act) (740 ILCS 110/1 et seq. (West 2006)). In December 2006, the circuit court in the Weil postdissolution proceeding found that Dr.”
Officer James T. McGreal v. Eric Ostrov, Doctor, Vill. of Alsip, Kenneth Wood, Chief of the Alsip Police Dep't, 368 F.3d 657 (7th Cir. 2004). · cites it 2× “Count IV, which was filed under seal, alleged violation of the Mental Health and Developmental Confidentiality Disabilities Act, 740 ILCS 110/1 et. seq., arising from the dissemination of Dr.”
In Re Marriage of Peters-Farrell, 835 N.E.2d 797 (Ill. 2005). · cites it 2× “In her motion, Jennifer asserted the Mental Health and Developmental Disabilities Confidentiality Act (Confidentiality Act) (740 ILCS 110/1 et seq. (West 2000)) prohibited disclosure of her prescription records without a court order and the subpoenas constituted an attempt to…”
Poulos v. Lutheran Soc. Servs. of Illinois, Inc., 728 N.E.2d 547 (Ill. App. Ct. 2000). · cites it 4× “B Defendants also argue the circuit court erred in refusing to direct a verdict or grant their motion for judgment notwithstanding the verdict affirming their immunity pursuant to the Illinois Mental Health and Developmental Disabilities Confidentiality Act (Act) (740 ILCS 110/1…”
Wisniewski v. Kownacki, 851 N.E.2d 1243 (Ill. 2006). · cites it 2× “Defendants objected to their disclosure, asserting that the records were privileged under the Mental Health and Developmental Disabilities Confidentiality Act (Confidentiality Act) (740 ILCS 110/1 et seq. (West 2002)) and the Alcoholism and Other Drug Abuse and Dependency Act…”
Suarez v. Pierard, 663 N.E.2d 1039 (Ill. App. Ct. 1996). · cites it 4× “Count I of plaintiff's complaint alleged that Pierard had a duty not to disclose information concerning plaintiff's medical treatment under the Mental Health and Developmental Disabilities Confidentiality Act (the Confidentiality Act) (740 ILCS 110/1 et seq.”
Sangirardi v. Vill. of Stickney, 793 N.E.2d 787 (Ill. App. Ct. 2003). · cites it 2× “(West 1998)), and improperly subjected plaintiff to disciplinary action when he invoked the Mental Health and Developmental Disabilities Confidentiality Act (740 ILCS 110/1 et seq. (West 1998)) to prevent disclosure of his psychological evaluation results.”
Reda v. Advocate Health Care, 765 N.E.2d 1002 (Ill. 2002). “Justice FREEMAN delivered the opinion of the court: During discovery in a medical malpractice action, the circuit court of Cook County twice ordered plaintiffs, Emilio and Mary Reda, to disclose Emilio's psychiatric records to defendants, Advocate Health Care, formerly doing…”
Sassali v. Rockford Mem'l Hosp., 693 N.E.2d 1287 (Ill. App. Ct. 1998). · cites it 2× “Plaintiff contends that the trial court erred in finding that the Mental Health and Developmental Disabilities Confidentiality Act (Confidentiality Act) (740 ILCS 110/1 et seq. (West 1994)) authorized defendants Rockford Memorial Hospital and Thomas DeFauw, Chief Executive…”
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