Gatekeeper and Report Builder pilots are enrollingJoin a pilot →
Guides · Medical malpractice

Who May Testify to the Standard of Care: Specialty Rules in Malpractice Cases

In most medical malpractice cases the decisive expert fight is not about methodology. It is about who is allowed to speak. Nearly every state requires expert testimony to establish the standard of care and its breach, and most states add rules about which physicians may give it: the same specialty as the defendant, or a similar one, often with recent clinical practice. A plaintiff whose only expert is held unqualified loses on summary judgment, so the qualification question decides more cases than the merits. This guide covers the specialty rules, the exceptions courts recognize, how far the rules reach, and how recent decisions have read them.

Guide 12 of 12 · November 3, 2026 · 7 min read
On this page
  1. Same specialty
  2. Shared standard
  3. Procedure experience
  4. Recency and causation
  5. Subspecialties
  6. Weight, not exclusion
  7. What to prepare

The baseline: same or similar specialty

The common starting point is that a physician in one field is not competent to testify about the standard of care in a different field. Statutes put this in different words. Delaware requires the expert to be familiar with the degree of skill ordinarily employed in the field of medicine on which the expert will testify. Ohio's evidence rule bars an expert in one specialty from testifying against a provider in another unless the expert shows that the standards of care and practice in the two specialties are similar and that the expert has substantial familiarity between them. Maryland requires board certification in the same or a related specialty when the defendant is board certified.

The rule cuts in both directions. In Gibson v. Soin (Ohio Ct. App. 2022), a cardiologist who was qualified as a cardiologist under Rule 702 was still held incompetent under Ohio's rule to testify against an anesthesiologist and a pain management specialist about presurgical cardiac clearance. He described what a cardiologist would do, but gave no testimony about how those specialists review presurgical testing, and the court of appeals affirmed a directed verdict.

The specialty that matters is the one the defendant was practicing, judged by the role they played. In Street v. Upper Chesapeake Medical Center (Md. Ct. Spec. App. 2024), the plaintiff's vascular surgeon was barred from testifying that the emergency physician should have arranged an immediate vascular consultation. The court reasoned that an emergency physician evaluates patients on the front line and decides whether a consultation is needed, while a vascular surgeon sees patients on referral, so the two were not related specialties on those facts.

The shared-standard exception

Most states recognize that some conditions carry one standard regardless of specialty. Delaware states two exceptions: where the methods of treating a particular ailment are generally the same in both schools, and where a physician trained in one school steps out of it to treat a patient as another school would.

Miller v. Christiana Care Health Services (Del. Super. Ct. 2018) applied the first. The plaintiffs claimed that emergency physicians missed an aortic dissection, and their experts were a former thoracic surgeon and a hospitalist, neither experienced in emergency medicine. Both testified that the symptoms present the same way in every setting and that doctors across fields are trained to respond to them the same way. The court distinguished an earlier case in which a neurologist tried to hold an emergency physician to a neurologist's standard, and held the experts qualified because the diagnostic standard for aortic dissection was shared.

The exception has limits. It requires a record showing the shared standard, usually from the expert's own testimony about training and practice, and it does not rescue an expert who disclaims the defendant's field. In Diagnostic X-Ray Physicians v. Lloyd (Ky. 2026), the plaintiff's orthopedic surgeon criticized radiologists for missing a retained surgical needle on X-ray, but agreed in deposition that he was not a radiologist and did not know the radiology standard of care. The Kentucky Supreme Court reinstated summary judgment: whatever his baseline qualification, he never testified to the radiologists' standard or its breach.

Experience with the procedure, not only the board

Courts increasingly look at what the expert has actually done. In Dubois v. Brantley (Ga. 2015), the court of appeals had held a surgeon unqualified to criticize a laparoscopic umbilical hernia repair because he had performed only one such repair in the preceding five years. The Georgia Supreme Court reversed, holding that Georgia's experience requirement is satisfied by experience in the area of practice at issue, and that a surgeon who had performed many other abdominal laparoscopic procedures could qualify.

The same logic runs across specialties. In Howell v. Cochran (Ga. Ct. App. 2022), a plastic surgeon whose practice was largely hand surgery, and who had performed about fifty finger replantations, was held qualified to testify against an orthopedic hand surgeon about a multi-digit replantation.

The flip side is a technique the expert has never performed. In Winham v. Reese (Okla. Civ. App. 2017), a retired general surgeon with long experience in open surgery was held unqualified to say that a gastroenterologist negligently performed an endoscopic sphincterotomy, a procedure he had never been trained to do. And an expert whose qualifications are simply not shown fares no better: in University of Mississippi Medical Center v. Kelly (Miss. 2023), an emergency physician offered against orthopedic care of a crush injury was held unqualified because nothing in the record showed his experience with such injuries or infections.

Recent practice, and whether the rule reaches causation

Many statutes add a recency requirement. California's statute for emergency physicians admits expert testimony only from physicians with substantial recent experience providing emergency coverage in a hospital emergency department. In Stokes v. Baker (Cal. Ct. App. 2019), the trial court applied that rule to bar a neurointerventional surgeon from testifying that a missed subarachnoid hemorrhage caused the plaintiff's injuries. The Court of Appeal reversed. Reading the statute's structure and history, it held that the requirement exists to give emergency physicians a fair appraisal of the standard of care, and that applying it to causation would produce absurd results where causation turns on medicine outside emergency practice.

The general point holds beyond California. Specialty and recency rules are written for standard of care opinions. Causation is a separate question, and the best causation witness is often a specialist in the injury, not a peer of the defendant. Check the statute's text before assuming it reaches both.

Specialties and subspecialties

Matching rules raise a further question: at what level must the specialties match? Michigan's statute requires a standard of care expert to specialize in the same specialty as the defendant, and for a time Michigan read that to require matching the one most relevant subspecialty.

In Stokes v. Swofford, decided with Selliman v. Colton (Mich. 2024), the Michigan Supreme Court overruled that reading in part. The court held that "specialty" in the statute means the general board specialties recognized by national certifying bodies, and that the statute does not require matching subspecialties. A neuroradiologist could testify against a board-certified diagnostic radiologist who read a brain scan, because neuroradiology falls within diagnostic radiology. The court stressed that other subsections still let trial courts weigh the expert's training, specialization and active practice, and exclude experts who match on paper but are not suited to the case.

The practical effect is that a board match opens the door but does not guarantee entry, and a subspecialty mismatch no longer closes it in Michigan.

When gaps go to weight

Even when an expert is in the right field, defendants attack the foundation: records not reviewed, unfamiliarity with the local community. Courts often treat these as weight. In Miller v. Carolina Coast Emergency Physicians (N.C. 2022), the trial court excluded the plaintiff's emergency physician expert for not reviewing certain records and for lack of familiarity with the local standard. The Court of Appeals reversed, holding that questions about the bases of an opinion go to its weight, and the North Carolina Supreme Court affirmed that the appellate court had applied the correct standard of review.

What to prepare

  • Identify the specialty the defendant was practicing at the time, by role, not only by board certificate.
  • Read your state's qualification statute for same, similar or related specialty, recency of practice, and the share of professional time required.
  • Check whether the statute reaches only standard of care testimony or causation as well.
  • If the expert is from another field, build a record that the standard for this condition is shared, in the expert's own words, tied to their training and practice.
  • Document the expert's actual experience with the procedure, including volume in the years before the event.
  • Make sure the expert never disclaims knowledge of the defendant's standard in deposition.
  • Consider separate experts for standard of care and causation when the causal question belongs to another specialty.

Supreme Mind builds Expert Witness AI Agents for litigation, for any expert on any matter, from case intake to settlement. A lawyer points an AI Agent at a matter and picks a class of expert, and one run returns a brief in four sections: the expert's likely opinion, ranked cross-examination weaknesses, the Daubert / Rule 702 attack surface, and a directional settlement range. Experts are de-identified composites of a class, never a named individual; supporting quotations are checked verbatim against the public record, authorities carry their check result, and nothing it produces is filed or testifies. A complete sample brief is free, and the method explains how it works.

Sources

This guide is general information, not legal advice.

How each court of appeals applies amended Rule 702: see the Rule 702 tracker.

Run this analysis against the expert on your own matter.Start freeRead a sample brief →

Experts in this guide's practice

Obstetrics standard-of-care expertEmergency medicine standard-of-care expertPediatric neurology birth-injury causation expertAnesthesiology standard-of-care expertRadiology missed-diagnosis expertGeneral surgery standard-of-care expertOrthopedic surgery standard-of-care expertHospital nursing standard-of-care expertNursing home and long-term care standards expertPsychiatric suicide-risk standard-of-care expertCardiology standard-of-care expertPediatrics standard-of-care expertPrimary care standard-of-care expert

The series

12Medical malpractice · November 3, 2026Who May Testify to the Standard of Care: Specialty Rules in Malpractice Cases11Commercial · October 27, 2026Lost-Profits Experts: Reasonable Certainty and Rule 70210Mass tort · October 20, 2026General Causation in Mass Torts: Bradford Hill Under Rule 70209Securities · October 19, 2026Section 11 Damages and Negative Causation08Antitrust · October 19, 2026Overcharge Regressions in Price-Fixing Cases07Antitrust · October 19, 2026How Often Courts Exclude Antitrust Economists, and Why06Securities · October 13, 2026Loss Causation, Damages and the Inflation Ribbon05Securities · October 6, 2026Market Efficiency at Class Certification: Cammer and Krogman04Any expert · September 29, 2026Amended Rule 702 After Nearly Three Years: What Courts Exclude03Antitrust · September 22, 2026Common Impact and Pass-Through at Class Certification02Securities · September 15, 2026Price Impact at Class Certification After Goldman01Securities · September 8, 2026Daubert Challenges to Event Studies in Securities Cases

Related: the expert agent library, a complete sample brief, and how it works.

GatekeeperExpert AgentsReport BuilderOne record, from intake to settlement
Book a demo
AI expert witness agents for litigation, from the first screen to settlement
Products
Solutions
Why Supreme Mind
Resources
Company
© 2026 Supreme Mind AI, Inc. All rights reserved.
Terms of ServicePrivacy PolicyDPA