Illinois Compiled Statutes
735 ILCS 5/8-2501 (2026)
Expert Witness Standards
✓ current as of May 2026
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(735 ILCS 5/8-2501)
(from Ch. 110, par. 8-2501)
Sec. 8-2501. Expert Witness Standards. In any case in which the standard of
care
given by a medical
profession is at issue, the court shall apply the
following standards to determine if a witness qualifies as an expert witness
and can testify on the issue of the appropriate standard of care.
(a)
Relationship of the medical specialties of the witness to the medical
problem or problems
and the type of treatment administered in the case;
(b) Whether the witness has devoted
a
substantial portion of his or her
time to the practice of medicine, teaching or University based research
in relation to the medical care and type of treatment at issue which gave
rise to the medical problem of which the plaintiff complains;
(c)
Whether the witness is licensed
in the same profession as the defendant; and
(d) Whether, in the case against a nonspecialist, the witness can
demonstrate a sufficient familiarity with the standard of care practiced in
this State.
(Source: P.A. 97-1145, eff. 1-18-13.)
(735 ILCS 5/Art. VIII Pt. 26 heading) Part 26.
Minors
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Notes of Decisions
Cited in 8
cases (2 in the last 5 years), 2007–2024 · leading case: Somers v. Quinn, 867 N.E.2d 539 (Ill. App. Ct. 2007).
Somers v. Quinn, 867 N.E.2d 539 (Ill. App. Ct. 2007). “Benson lacked a medical license at the time of his evidence deposition, his qualifications did not meet the standards for expert medical witnesses set forth in section 8-2501 of the Code of Civil Procedure (the Code) (735 ILCS 5/8-2501 (West 2004)). Defendant attached to his…”
Lebron v. Gottlieb Mem'l Hosp., 930 N.E.2d 895 (Ill. 2010). “sible "[a]ny expression of grief, apology, or explanation" made by a health-care provider to a patient, a patient's family or a "patient's legal representative" regarding "an inadequate or unanticipated treatment or care outcome" provided within 72 hours of when "the provider…”
Biundo v. Bolton, 2020 IL App (1st) 191970 (Ill. App. Ct. 2020). “” 735 ILCS 5/8-2501(b) (West 2014). The trial court is to consider the precise testimony that is proposed and determine whether the witness qualifies as an expert in the kind of treatment criticized.”
McWilliams v. Dettore, 901 N.E.2d 1023 (Ill. App. Ct. 2009). “2d 224 (1992); see also 735 ILCS 5/8-2501(a) (West 2006) (board certification in the same specialty is only one factor for a trial court to consider).”
Christmas v. Dr. Donald W. Hugar, Ltd., 949 N.E.2d 675 (Ill. App. Ct. 2011). “In that version, one of the requirements for section 2-622 report authors was that they meet the expert witness standards [2] promulgated in section 8-2501 of the Code of Civil Procedure (735 ILCS 5/8-2501 (West 2008)), which includes the nearly identical consideration of…”
Biundo v. Bolton, 2020 IL App (1st) 191970 (Ill. App. Ct. 2021). “2d 868, 874 (2001); see 735 ILCS 5/8-2501 (West 2014) (civil procedure statute regarding expert witnesses).”
Adrian Smith + Gordon Gill Architecture LLP v. Chicago Shakespeare Theater, 2024 IL App (1st) 230133 (Ill. App. Ct. 2024). “Unlike medical malpractice cases where statute imposes express requirements as to standard of care experts, 735 ILCS 5/8-2501 (West 2022), in most other cases, an expert need not be licensed or formally trained.”
Christmas v. Hugar (Ill. App. Ct. 2011). “1-10-1743 requirements for section 2-622 report authors was that they meet the expert witness standards2 promulgated in section 8-2501 of the Code of Civil Procedure (735 ILCS 5/8-2501 (West 2008)), which includes the nearly identical consideration of “whether the witness is…”
— 735 ILCS 5/8-2501(a) — 1 case
McWilliams v. Dettore, 901 N.E.2d 1023 (Ill. App. Ct. 2009). “2d 224 (1992); see also 735 ILCS 5/8-2501(a) (West 2006) (board certification in the same specialty is only one factor for a trial court to consider).”
— 735 ILCS 5/8-2501(b) — 2 cases
Biundo v. Bolton, 2020 IL App (1st) 191970 (Ill. App. Ct. 2020). “” 735 ILCS 5/8-2501(b) (West 2014). The trial court is to consider the precise testimony that is proposed and determine whether the witness qualifies as an expert in the kind of treatment criticized.”
Biundo v. Bolton, 2020 IL App (1st) 191970 (Ill. App. Ct. 2021). “2d 868, 874 (2001); see 735 ILCS 5/8-2501 (West 2014) (civil procedure statute regarding expert witnesses).”
— 735 ILCS 5/8-2501(c) — 1 case
Somers v. Quinn, 867 N.E.2d 539 (Ill. App. Ct. 2007). “Benson lacked a medical license at the time of his evidence deposition, his qualifications did not meet the standards for expert medical witnesses set forth in section 8-2501 of the Code of Civil Procedure (the Code) (735 ILCS 5/8-2501 (West 2004)). Defendant attached to his…”
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