California Evidence Code 1157 shields the internal records and proceedings of medical peer review committees from discovery in most civil lawsuits.1California Legislative Information. California Code Evidence Code 1157 – Proceedings and Records of Organized Committees Plaintiffs in medical malpractice cases and other civil actions generally cannot obtain committee meeting minutes, investigation reports, findings, or testimony about what happened during a peer review session. The shield is broad but not absolute, and the exceptions matter as much as the rule.
What the Statute Protects
Section 1157 covers two categories of material: the proceedings and the records of a qualifying peer review committee.1California Legislative Information. California Code Evidence Code 1157 – Proceedings and Records of Organized Committees That reaches documents generated by the review process itself: meeting minutes discussing patient outcomes, internal investigation reports, committee findings, and corrective action recommendations.
The statute also bars anyone who attended a committee meeting from being compelled to testify about what was said there. A plaintiff’s attorney cannot depose a committee member and ask what the group concluded about a surgeon’s competence. That line of questioning is off-limits.
What Stays Discoverable
The protection applies to the committee’s evaluative work, not to the underlying facts of a patient’s care. Medical records, imaging results, lab work, surgical notes, and nursing documentation remain fair game in discovery. A hospital cannot hide damaging medical records by routing them through a peer review committee. Information that existed independently before the committee examined it stays discoverable regardless of whether the committee later reviewed it.
The same principle applies to administrative records. Staffing logs, equipment maintenance records, and similar operational documents do not become privileged just because someone handed a copy to the committee. The committee’s analysis of the facts is protected; the facts themselves are not.
Which Committees Qualify
The statute names committees of specific professional staffs at licensed hospitals: medical, medical-dental, podiatric, registered dietitian, psychological, marriage and family therapist, licensed clinical social worker, professional clinical counselor, pharmacist, prehospital emergency medical care personnel, and veterinary staffs.1California Legislative Information. California Code Evidence Code 1157 – Proceedings and Records of Organized Committees
The protection also extends to any “peer review body” as defined in Business and Professions Code 805, which pulls in several additional entities:2California Legislative Information. California Business and Professions Code 805
- The medical or professional staff of a facility licensed under the Health and Safety Code, including Medicare-certified ambulatory surgical centers.
- Health care service plans and disability insurers that contract with providers at alternative payment rates.
- Nonprofit, tax-exempt medical, psychological, dental, podiatric, marriage and family therapy, social work, professional clinical counselor, and midwifery societies that include at least 25 percent of the eligible practitioners in their geographic area.
- Committees organized by any entity that employs or consists of more than 25 practitioners of the same license class, when the committee’s purpose is reviewing the quality of professional care.
Exceptions That Reopen Discovery
Section 1157 has several statutory holes. Each one comes up regularly in litigation.
Statements by Parties to the Underlying Lawsuit
If a peer review committee discusses a case in which a committee attendee is already a named party in a lawsuit, that attendee’s statements at the meeting are not protected.1California Legislative Information. California Code Evidence Code 1157 – Proceedings and Records of Organized Committees The exception typically catches physicians who are defendants in malpractice cases. If the hospital’s quality committee reviews the incident that spawned the suit and the defendant doctor speaks, the plaintiff can seek discovery of those statements.
Applicants for Staff Privileges
The privilege does not block access for a person requesting hospital staff privileges. A physician going through credentialing or reappointment can obtain the committee records relevant to decisions about their own clinical privileges.
Insurance Bad Faith Actions
The protection falls away in a lawsuit against an insurer alleging bad faith for refusing to accept a settlement offer within policy limits. In that context, peer review records bearing on the quality of the physician’s care can become relevant to whether the refusal to settle was reasonable.
Oversized Society Committees
Professional society committees lose the protection if they exceed 10 percent of the society’s total membership. When a committee grows into a general assembly, the candor rationale weakens and the shield disappears.
Committee Members Reviewing Their Own Conduct
A committee member cannot claim the privilege for a proceeding that reviewed the member’s own conduct or practice. You cannot sit on the committee evaluating your own care and then shield the resulting records.
Criminal Actions
The statute explicitly states that the privilege does not prevent discovery or use of relevant evidence in a criminal case. Prosecutors can obtain peer review records that would be off-limits in a civil malpractice suit.
Federal Court Changes the Analysis
This is where the protection can evaporate. Under Federal Rule of Evidence 501, a federal court hearing a case under federal question jurisdiction applies federal privilege law rather than California’s. Most federal circuits that have addressed the issue have declined to recognize a medical peer review privilege under federal common law, particularly in employment discrimination and antitrust cases. Courts in the Fourth, Sixth, Seventh, and Eleventh Circuits have all rejected the privilege in such cases, reasoning that the plaintiff’s need for the evidence outweighs the policy interest in candid peer review.
Diversity cases work differently. When a federal court hears a state-law claim between citizens of different states, the court applies the forum state’s privilege rules, so Section 1157 still applies to a California malpractice suit that lands in federal court on diversity grounds. But the same physician facing a federal civil rights claim or an antitrust suit may find that peer review records untouchable in state court become fully discoverable in federal court. Anyone involved in peer review who faces potential federal claims should understand that California’s protection has a jurisdictional ceiling.
Related California Statutes
Two companion statutes extend similar protection to additional review bodies. Evidence Code 1157.5 covers organized committees within nonprofit medical care foundations or professional standards review organizations that evaluate healthcare services for medical necessity, quality of care, or reasonableness of charges.3California Legislative Information. California Code Evidence Code 1157.5 Section 1157.5 does not apply in lawsuits where a healthcare provider is suing to collect payment for services rendered.
Evidence Code 1157.7 extends the protection to committees established by local government agencies to monitor and evaluate specialty health services, such as trauma care, at designated general acute care hospitals.4California Legislative Information. California Code Evidence Code 1157.7 That statute also exempts those committee records from California’s Public Records Act and open-meeting requirements.
Overlapping Federal Protections
Two federal laws sit alongside Section 1157 and can either add protection or impose obligations that the state statute does not address.
The Health Care Quality Improvement Act
The Health Care Quality Improvement Act of 1986 provides qualified immunity from damages for participants in professional peer review actions, provided the review meets certain procedural standards, including a reasonable belief that the action furthered quality care and a reasonable effort to establish the facts.5Office of the Law Revision Counsel. 42 U.S. Code 11111 – Professional Review The immunity covers the review body, its members and staff, and anyone who assists with the review. It does not extend to claims brought under federal civil rights laws, including Title VII and Section 1981.
HCQIA also created the National Practitioner Data Bank, which requires hospitals and healthcare entities with formal peer review to report adverse actions restricting a practitioner’s clinical privileges for more than 30 days, along with voluntary surrenders of privileges made during or to avoid an investigation.6National Practitioner Data Bank. What You Must Report to the NPDB Reports must be filed within 30 days of the action.
The Patient Safety and Quality Improvement Act
The Patient Safety and Quality Improvement Act of 2005 created a separate federal privilege for “patient safety work product,” meaning information collected and analyzed during the reporting and investigation of patient safety events.7HHS.gov. Understanding Confidentiality of Patient Safety Work Product When a provider voluntarily reports this information to a certified Patient Safety Organization, the material cannot be subpoenaed, discovered, disclosed under FOIA, or admitted as evidence in any federal, state, or administrative proceeding.8GovInfo. 42 USC 299b-22
Unlike state peer review privileges, which courts can sometimes override when the evidence is critical to a plaintiff’s case, the PSQIA privilege is essentially absolute for qualifying material. The tradeoff is scope: the protection covers only information developed for and reported to a certified PSO. Peer review records a hospital keeps entirely in-house, without reporting to a PSO, get no federal layer and rely on Section 1157 alone.