Illinois IL462-2005: Petition for Involuntary Admission

This five-page Illinois petition asserts that a person is subject to involuntary or judicial inpatient admission under the Mental Health and Developmental Disabilities Code. Clinicians meet it in emergency departments and psychiatric units when they act as petitioner. The facility files it with the circuit court along with examiners' certificates on IL462-2006, and the respondent receives a copy and a written statement of rights.

Who completes it

Any adult can be the petitioner; in practice it is often an emergency physician, psychiatrist or social worker, who completes the legal basis, the narrative, witnesses, family contacts and signature. Facility staff complete the admission and copy-delivery statements and the rights acknowledgment on pages 4 and 5, and a transporting peace officer may complete the petition.

How to fill it in

In the Matter of (name of respondent)

Fill in the circuit court county and judicial circuit, the respondent's name and whether they are asserted to be subject to judicial or involuntary admission. Then select one or more legal bases, such as emergency inpatient admission by certificate with the name of the detaining facility, admission by court order, a voluntary admittee's discharge request or failure to reaffirm, continued admission, or developmental disability admission.

I assert that (name) is: (check all that apply)

Check each standard that applies: mental illness with a reasonable expectation of conduct causing physical harm; inability to provide for basic physical needs; refusing or not adhering to treatment with expected deterioration to one of the first two standards; or developmental disability with expected serious physical harm in the near future. Indicate whether immediate hospitalization is needed to prevent harm.

I base the foregoing assertion on the following

State in detail the signs and symptoms of mental illness, prior diagnosis, treatment and hospitalizations, and any threats, behavior or pattern of behavior that support the petition. Include your own personal observations. The court reads this narrative to decide whether the facts meet the standards checked above, so tie each checked standard to specific facts. Attach additional pages if needed.

Witnesses and family or substitute decision maker

List witnesses who can prove the facts asserted. Then list the spouse, parent, guardian or substitute decision maker and a close relative, or a friend if there is none. If you cannot list them, describe the specific steps of the diligent inquiry you made to identify and locate them; attach pages as needed.

Legal interest, financial interest and litigation

Check whether you have a legal interest or a financial interest in the matter and whether you are involved in litigation with the respondent. If any answer is yes, explain why it would not be practicable or possible for someone else to be the petitioner.

Certificates of examination

Indicate whether one or two Certificates of Examination are attached. If none, check the statement that no physician, qualified examiner or clinical psychologist was available or could examine the respondent despite diligent effort, and that an effort to get the respondent to appear voluntarily was made or would risk harm.

Peace officer detention and transport

Answer whether a peace officer detained, took into custody or transported the respondent. If yes and the officer did not complete the petition, enter the transporting officer's name, badge number and employer. This information must be entered; it is not optional when an officer was involved.

Notification choices and petitioner signature

Choose whether to be notified if the person is approved for voluntary or informal admission before adjudication, or is committed or discharged by the court; no choice means no notification. Confirm a good faith attempt to find a health care power of attorney or mental health treatment declaration. Sign with date, time, relationship to respondent, printed name, address and telephone number.

Admission, copy of petition and Rights of Admittee

Facility staff record the date and time of admission and of petition completion and certify that, within 12 hours of admission, the respondent received a copy of the petition, an explanation of the Rights of Admittee and a copy of IL462-2001. Page 5 records the language the copy was provided in, the staff signature, and the individual's signature or a witness if they refuse.

Common mistakes

  • Writing conclusions such as dangerous or psychotic without the specific signs, symptoms, threats, behavior, prior diagnoses and hospitalizations the narrative section asks for.
  • Leaving the family and substitute decision maker lines blank without describing the specific diligent inquiry steps taken to identify and locate them.
  • Checking a legal or financial interest, or litigation with the respondent, without explaining why no one else could practicably be the petitioner.
  • Omitting the transporting officer's name, badge number and employer when police brought the person in and did not complete the petition themselves.
  • Leaving the notification choice blank when the petitioner wants updates; the form treats a missing choice as a decision not to be notified.
  • Missing the 12-hour window to give the respondent a copy of the petition, the Rights of Admittee and IL462-2001.

Submitting and payment

How to submit it
The facility files the petition and first certificate with the circuit court within 24 hours of admission, excluding weekends and holidays. Within 12 hours of admission, the respondent must be given a copy of the petition, the Rights of Admittee and form IL462-2001.

Good to know

  • Page 1 asks for the legal basis: emergency admission by certificate (405 ILCS 5/3-600), admission by court order (5/3-700), voluntary admittees seeking discharge, continued admission, or developmental disability admissions.
  • A person brought in on the petition alone must be examined within 24 hours or released, and a psychiatrist different from the first examiner must examine within 24 hours, excluding weekends and holidays.
  • If no certificate is attached, the petitioner must state that no physician, qualified examiner or clinical psychologist could be found despite diligent effort, and that voluntary examination was tried or would be risky.
  • Knowingly making a false statement on the petition is a Class A misdemeanor. The current revision is IL462-2005 (R-01-24), a fillable, digitally signed PDF.

Get the official form

Download the current version from the source each time; forms change without notice.

Petition for Involuntary/Judicial Admission

How this list is checked

A form is listed only after its name and number were confirmed on the issuing agency’s or insurer’s own website, or in the form itself. Each entry links to that source. The list was last checked in October 2026. Forms and their requirements change without notice, so check the official page for the current version before you complete one.

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Frequently asked questions

Who can sign an Illinois petition for involuntary admission?

Any adult can be the petitioner. The petition asks whether you have a legal or financial interest in the matter or are in litigation with the respondent; if so, you must explain why it would not be practicable for someone else to petition. A peace officer who transported the person may complete it, otherwise the officer's name, badge number and employer must be entered.

What should the narrative on page 2 include?

The form asks you to state in detail the signs and symptoms of mental illness, prior diagnosis, treatment and hospitalizations, any threats, behavior or pattern of behavior supporting the petition, and your personal observations. Attach extra pages if needed, and list witnesses who can prove the facts asserted.

How many certificates go with the petition?

The petition lets you indicate that one or two Certificates of Examination (IL462-2006) are attached, or that none could be obtained. Petitions based on a voluntary admittee's discharge request or failure to reaffirm require two certificates. For involuntary admission, a second examination by a psychiatrist must follow within 24 hours, excluding weekends and holidays.

Will the petitioner be told if the patient is discharged?

Only if requested. Page 3 lets the petitioner ask to be notified if the person is approved for voluntary or informal admission before adjudication (staff use IL462-2203) or if the court commits or discharges them (IL462-2208M). Leaving the choice blank is treated as a decision not to be notified.