For years, a plaintiff filing a medical-malpractice claim in federal court on diversity had to guess whether the state's certificate-of-merit statute traveled with the claim. The circuits split, defense counsel used the requirement as an early dismissal lever, and the answer often turned on nothing more than which state and which circuit the case happened to sit in. The Supreme Court closed that question in January 2026.
What Berk v. Choy decided
In Berk v. Choy, decided January 20, 2026, the Court held that a state affidavit-of-merit statute does not apply to a malpractice claim filed in federal court. The plaintiff had sued under Delaware law without the affidavit that Delaware requires, which must show reasonable grounds to believe negligence occurred. The Court reasoned that the state requirement conflicts with Federal Rule of Civil Procedure 8, which asks only for a short and plain statement showing entitlement to relief and demands no evidentiary support at the pleading stage. Under the Rules Enabling Act framework, the Federal Rule governs.
The practical effect is narrow but real. A merit-affidavit requirement that defendants routinely used to force early dismissal, or early settlement leverage, in federal diversity cases no longer applies there. The front-end fight shifts back to the ordinary federal tools: Rule 12 for pleading sufficiency, Rule 26 for case management and sequencing, and Rule 56 for summary judgment after discovery.
Forum choice is now a live strategic question
Berk does not touch state-court practice. If your case sits in state court, the certificate-of-merit statute applies exactly as before, and blowing its deadline is still fatal. What changed is the calculus when diversity exists. A plaintiff who cannot line up a supporting expert before the state statute's clock runs may now find a federal forum meaningfully more forgiving at the threshold.
That said, do not confuse a pleading rule with a proof rule. Federal court still requires expert testimony on standard of care and causation to survive summary judgment in virtually every malpractice case. Berk removes a gate at the front of the case. It does not remove the expert who has to win it later.
Sourcing the standard-of-care expert
The expert question is where these cases are actually won or lost, and the requirements are getting stricter, not looser. Same-specialty rules in many states demand that the opining expert practice in the defendant's field, and sometimes that the expert have been in active clinical practice within a set window before the incident. Screen for those constraints before retention, not after a challenge:
- Confirm board certification and active practice matching the defendant's specialty and, where relevant, subspecialty.
- Check the state's clinical-practice recency requirement and the expert's teaching-versus-treating mix.
- Vet the expert's prior testimony for consistency, because the defense will pull every transcript it can find.
For a plaintiff who needs the merit affidavit in state court, this vetting has to happen fast, which is one more reason the federal-forum option matters after Berk.
The EMR audit trail is the discovery centerpiece
Modern malpractice discovery lives in the metadata. The electronic medical record's audit trail logs who accessed the chart, when, what they viewed, and every edit, addition, or deletion, along with timestamps. Federal record-keeping rules require providers to maintain those logs, and they are discoverable.
The audit trail matters because the printed chart is a clean narrative while the audit trail is what actually happened. It can show:
- Late entries and back-dated documentation created after an adverse event.
- Who reviewed a critical lab or imaging result, and when, which goes straight to failure-to-act theories.
- Copy-forward practices that carry a single error across successive notes.
- Deletions or amendments that the face of the record does not disclose.
Request the audit trail in native format with the metadata intact, and request it early, because retention windows and vendor archiving practices vary. Defendants often resist, citing burden or proprietary system limits. Push through it, because the gap between the chart and the log is frequently where the case turns.
The chart tells you what the provider wants the record to say. The audit trail tells you what the provider actually did, and when they decided to write it down.
Informed consent and the documentation gap
Informed-consent claims turn on the same documentation discipline. A signed consent form is not the end of the inquiry; the question is whether the disclosure matched the risk the patient actually faced and whether it happened before the patient was sedated or committed to the procedure. Audit-trail timestamps on the consent entry, measured against the pre-op timeline, can expose a form signed as an afterthought.
Do not forget the lien math
A malpractice recovery brings the same reimbursement pressure as any injury case, often more, because the treating entity and the defendant can be the same hospital system. Hospital and provider liens, ERISA plan reimbursement, and Medicare conditional payments all attach to the recovery, and negotiating them down is part of delivering real value to the client. Build the lien-resolution plan while the case is pending, not after the check clears.
Where this leaves practitioners
Berk v. Choy did not lower the bar for proving malpractice. It moved one procedural gate and made forum selection a sharper strategic decision in diversity cases. The cases that win still start with a qualified same-specialty expert and a fully developed audit trail, and they finish with disciplined lien resolution. For more, see our continuing medical-malpractice coverage, the case law and settlements shaping standard-of-care litigation, and our practical guidance on lien resolution and settlement accounting.