Expert Testimony and Medical Journals: Navigating New York Courts

Medical literature can play different roles in a New York case: supporting an expert’s reasoning, testing that reasoning on cross-examination, or being offered as proof of what the publication says. Those are different evidentiary questions. A journal’s reputation does not make every use of every article permissible.

This October 2009 note discussed Zito, Lenzini and Brown. The original first-person assessment remains below, followed by a more precise explanation of the decisions. The earlier expansion’s categorical department split and claim of a new “2026” notarization reform have been corrected.

Historical note (September 2026): this note preserves a 2009 question about medical literature in expert testimony and reads the decisions that answered it. For current expert practice in injury cases see expert witnesses in New York car accident cases.

Jason Tenenbaum’s original question

The following is preserved from the imported historical note. Its references to recent developments describe the author’s 2009 perspective, not a statement that the law remains unchanged today.

In federal practice and in the practice of most states that have codified their rules of evidence, the answer to this question is a resounding yes.  Historically, the answer to this question in New York, however, has been a “no”.  Over the last few years, the courts in New York have tackled this question, whether directly or indirectly, and have reached inconsistent decisions.  It is thus a mixed bag as to how a New York court would resolve this issue as you will see below.  I believe that there is one point of consensus on this issue:  an expert on direct examination may mention that a journal article or learned treatise conforms to his or her medical rationale.  Beyond this, the law is unsettled.

Zito: scientific foundation, not a blanket hearsay exception

Zito v Zabarsky, 28 AD3d 42 (2d Dept 2006), concerned the exclusion of proposed causation testimony following a Frye hearing in a medical malpractice case. The trial court required literature describing circumstances virtually identical to the patient’s.

The Second Department held that approach too restrictive. The experts had supported their theory with existing data, accepted scientific principles and reasoned methodology. The judgment was reversed and the matter remitted for a new trial.

Zito therefore addresses the admissibility of a scientific opinion and how its foundation may be established. It is not a general ruling that counsel may read any authoritative medical article to a jury for its truth. That distinction is important when evaluating literature used in personal injury or no-fault defense matters.

Lenzini: the witness’s actual use of the text matters

Lenzini v Kessler, 48 AD3d 220 (1st Dept 2008), permitted impeachment using materials that the record showed the experts regarded as reliable. One expert had brought a medical text to court and annotated it; another expressly recognized the relevant material’s reliability.

The court distinguished offering a scientific text for its truth from its proper use in cross-examination. It did not give an expert an automatic veto merely for declining to endorse every sentence of a publication.

The historical passage quoted in the original discussion remains:

“Although a scientific text is inadmissible as hearsay when offered for its truth or to establish a standard of care, it may be introduced to cross-examine an expert witness where it has been demonstrated that the work is the type of material commonly relied upon in the profession and has been deemed authoritative by such expert.”

Brown: reliance and harmless error are different holdings

Brown v Speaker, 66 AD3d 422 (1st Dept 2009), arose from a LASIK malpractice trial. The court allowed the defense expert to rely on respected journals from the period of the treatment when discussing the standard of care.

“Defendants’ expert, testifying about the standard of care at the time of plaintiff’s surgery in 2000, was properly permitted to rely on articles from 1999-2000 journals that were well-respected and accepted by experts in the field.”

But the opinion did not simply abolish Lenzini’s distinction. It separately assumed, without deciding, possible errors in testimony describing an article’s satisfaction-rate findings and in cross-examination involving an article the witness had not accepted as authoritative. It found those assumed errors harmless on the record.

The earlier page described Brown as a significant retreat from Lenzini. That was too categorical: permission to rely on literature, permission to convey its contents, and harmless-error review must be read separately.

For a concrete comparison, the Wild and Winiarski impeachment note examines a DVD and a medical treatise that the witnesses had not accepted as authoritative.

Keep the opinion separate from the underlying material

When evaluating a proposed expert submission, work through the intended use:

• Identify the issue the expert is addressing and the reasoning connecting the materials to the opinion.
• Identify the actual article, edition and relevant passage, not just the name of a respected journal.
• Distinguish a foundation dispute from a request to admit the source itself or repeat its contents to the fact-finder.
• Preserve the court’s ruling and any limits on how the material may be used.

An expert’s reference list is not a substitute for analysis. Conversely, the absence of an article describing identical facts should not be treated as automatically dispositive without examining the applicable foundation standard. The Wagman/peer-review discussion addresses a related records-basis question; it should not be read as making every hearsay source admissible.

Affirmation form is a separate issue

The expansion of CPLR 2106 to affirmations by any person took effect January 1, 2024, as reflected in Matter of Sweet v Fonvil. The current statute also lists covered documents and express exceptions. It is inaccurate to describe the any-person change as originating in 2026.

Using an affirmation does not cure hearsay, supply an expert’s qualifications or authenticate every attached publication. Compare the historical High Quality Medical affirmation case for the distinction between document form and the substance of an opposition.

For the broader set of related case notes, visit the Legal Encyclopedia and New York No-Fault Insurance Law. For a matter-specific review, request a Free Case Review.

Connect to the Encyclopedia

• Topic hub: Expert Testimony & Qualifications
• Expert competency and medical literature in New York medical malpractice and no-fault cases
• The critical role of medical literature in expert testimony
• Expert testimony regarding unsworn MRI reports as competent evidence
• Medical malpractice expert witness qualifications for sub-specialists
• New York No-Fault Insurance Law
• Understanding Article 10 Evidentiary Issues: Expert Witness Testimony and Hearsay Rules in New York Courts
• Hearsay

Last reviewed: September 2026. Original first-person commentary and the two historical court excerpts are preserved. The case summaries, FAQ answers and affirmation chronology have been corrected using the linked sources; this is not a comprehensive current-law or citator opinion.