In this defamation action brought by a physician, the defendant hospital and hospital administrators appeal from an interlocutory order of a Superior Court judge ordering production of documents and responses to interrogatories the defendants claim are protected from discovery under the “medical peer review privilege.” See G. L. c. Ill, §§ 204 (a)-(b) and 205 (b).4 The information ordered to be produced included credentialing communications between the defendants and third parties and materials related to the physician’s summary suspension from the hospital after an incident of alleged verbal and physical threatening behavior and the consequent activities of the hospital’s medical peer review committee.5
*427In ordering discovery of the disputed documents, the judge concluded that the credentialing communications fell outside the ambit of privileged medical peer review materials, and that the other information requested, while within the privilege, must nevertheless be produced under the statutory exception for peer review activities not undertaken in good faith. See G. L. c. 111, §§ 204 (b), 205 (b); G. L. c. 231, § 85N. Thus, we are asked once again to examine the extent to which communications for the purpose of medical peer review may be kept confidential and for what purposes the privilege may be pierced. See Pardo v. General Hosp. Corp., 446 Mass. 1 (2006). For the reasons discussed below, we conclude that the order must be vacated and the case remanded for further proceedings consistent with our opinion.
1. Background. We summarize the relevant facts from the judge’s memorandum of decision and from the record, reserving the recitation of other relevant facts for later discussion. The defendant Franklin Medical Center (FMC) is a licensed Massachusetts hospital. As such, it is required by stringent Federal and State laws and regulations to maintain quality assessment and risk management programs. Among these programs are policies and procedures to report and address behavior by hospital staff that might be inconsistent with or harmful to good patient care or safety. G. L. c. Ill, § 203 (a)-(d). Accordingly, FMC established medical staff bylaws that provided, among other things, for the summary suspension of a physician’s membership or clinical privileges when necessary to “reduce the substantial likelihood of injury or damage to the health or safety of any patient, employee, or other person at the Medical Center; or . . . [f]or the continued effective operation of the Medical Center.”6 FMC also established a separate policy on *428medical staff “disruptive behavior” that specifies the targeted behavior 7 and set out detailed procedures for documentation, investigation, notice to the physician with the opportunity to respond, and “corrective” actions.8
*429The incident that precipitated this litigation occurred at approximately 7 a.m. on October 28, 2004, at a regularly scheduled meeting of FMC’s surgical support services committee. In attendance was the plaintiff, William Vranos, an orthopedic surgeon who was a partner in Franklin Orthopedic Group in Greenfield, a member of the medical staff of FMC, and, since January, 2002, chief of FMC’s department of surgery. Also attending were Henry K. Godek, FMC chief of anesthesia; the defendant Kenneth Gaspard, director of surgical and material services; and Kim Cotter, Gaspard’s assistant.
During the meeting, Vranos and Gaspard exchanged heated words over a new policy that would restrict the availability of surgical services. The parties agree that the argument quickly escalated, although they offer differing accounts of who used inappropriate and threatening verbal and body language to whom. It is uncontested that approximately ten days before the meeting, forty-nine members of the department of surgery, including Vranos, signed a “memorandum of concern” (memorandum) expressing doubts about the judgment of Gaspard and Cotter in managing the surgical department.
Shortly after the meeting, Gaspard reported to the defendant Michael D. Skinner, FMC’s president, that he had been physically threatened and verbally abused by Vranos at the meeting. Gaspard told Skinner that Vranos raised his voice repeatedly, slammed charts and documents down on the table, grabbed a chair and threw it aside, and angrily demanded that Gaspard remain in the meeting when Gaspard wanted to leave. Gaspard told Skinner that he was afraid during the incident that Vranos might hit him, and that he still felt unsafe.
Skinner and Vranos had had previous dealings concerning Vranos’s relationship to FMC. Specifically, for nearly six months prior to October 28, 2004, Skinner attempted to recruit Vranos to leave the Franklin Orthopedic Group and establish a competing orthopedic practice at FMC. Vranos had declined Skinner’s offer and instead, in September, 2004, accepted a position at Brattleboro Memorial Hospital in Vermont, less than twenty miles from FMC, effective January 1, 2005.
*430At approximately 8:30 a.m. on the day of the altercation, Skinner met with Cotter and John Brady, PMC’s director of human resources. Cotter corroborated Gaspard’s version of events, and said she had been frightened during the encounter between Vranos and Gaspard. At one point during her meeting with Skinner and Brady, Cotter began to tremble and cry. Subsequent to these meetings, Skinner arranged for the vice-president of hospital operations and the director of employee relations to interview Gaspard and Cotter to confirm their accounts.
On October 29, 2004, Skinner called Vranos to his office. During the meeting, Skinner handed Vranos a notice of a summary suspension, effective immediately.9 The notice stated in part that Vranos “used intimidating, abusive, and hostile language and exhibited threatening behavior, including picking up a stack of papers and slamming them down on the table, picking up a chair and slamming it down in the conference room, and placing [himself] physically close to one or more individuals while speaking in loud, angry, and confrontational manner [during the October 28 meeting].” The notice also stated that Vranos had “a history of disruptive behavior . . . [and] unprofessional conduct ... at PMC,” and that Vranos’s behavior and conduct “has been perceived to be intimidating, abusive, hostile, and physically threatening.”10
The judge determined, for purposes of the discovery order, that, prior to issuing the notice to Vranos, Skinner did not give Vranos the opportunity to explain himself. Nor did Skinner contact Godek prior to issuing the summary suspension or consult with the patient care assessment coordinator as provided in PMC’s policy addressing disruptive physician behavior. However, pursuant to its medical staff bylaws, within three business days of the suspension, on November 3, 2004, PMC convened a medical staff summary suspension review committee (review committee) to consider the terms of Vranos’s suspension and to advise PMC’s *431board of trustees whether to continue, modify, or terminate the suspension. The bylaws provided that the review committee be composed of various officers and staff, including the president or a designated representative. Skinner was a member of the review committee that considered Vranos’s suspension on November 3.
After reviewing submissions by Vranos, Godek, Gaspard, Cotter, Skinner, and several other physicians, the committee recommended that Vranos’s suspension be lifted provided that he (1) resign as chief of surgery; (2) apologize to Gaspard and Cotter; and (3) seek anger management counseling or its equivalent. The FMC board of trustees (trustees) accepted the recommendation on November 9. Vranos agreed to the terms, and the suspension was lifted that day. Vranos waived his right to a hearing to challenge his suspension and returned to work on November 10, with full medical staff membership and clinical privileges.
On March 3, 2005, Vranos filed his unverified complaint for defamation against FMC, Skinner, and Gaspard.11 The gravamen of Vranos’s complaint is that, in the course of the summary suspension investigation and review, Skinner and Gaspard published untrue statements about Vranos’s professional conduct that were motivated by their animus toward Vranos as a result of their prior interactions with him, as recounted above.12 In the course of discovery, Vranos requested production of two categories of information: (1) documents and responses to inter*432rogatories concerning credentialing communications between FMC and other hospitals, State regulators, and other credentialing organizations (credentialing materials)13; and (2) material prepared for the summary suspension of Vranos in connection with the peer review committee, including incident reports, memoranda, narrative statements, committee minutes, and other documents submitted to the review committee and the board of trustees (disputed peer review documents).14 The defendants objected to the majority of the requests on the basis of the medical peer review privilege, and Vranos subsequently moved to compel discovery, which the judge allowed in relevant part.15 Simultaneously, the hospital petitioned for reconsideration and *433for interlocutory review by a single justice of the Appeals Court pursuant to G. L. c. 231, § 118. The motion for reconsideration was denied on April 24, 2006, and on May 11, 2006, the single justice granted FMC’s petition. On July 19, 2006, we granted Vranos’s application for direct appellate review.
2. Discussion. Because our opinion involves the complex regulatory scheme governing health care facility quality assessment and risk management, we begin with a brief summary of that scheme, which we have described at some length in prior cases. See, e.g., Carr v. Howard, 426 Mass. 514, 517-526 (1998); Beth Israel Hosp. Ass’n v. Board of Registration in Med., 401 Mass. 172, 177-182 (1987).
a. Medical peer review. Strong public policy mandates the highest quality of care in our health care facilities. That public policy finds voice in, among others, a strict regulatory scheme covering virtually all aspects of hospital operations. Integral to this regulatory scheme is an effective process for self-scrutiny, manifest most prominently in the medical peer review process. For more than twenty years, both Federal and State laws have required and regulated medical peer review committees in hospitals, and for that same length of time, laws have protected the confidentiality of medical peer review proceedings. See generally Carr v. Howard, supra at 517-518. The Health Care Quality Improvement Act, 42 U.S.C. §§ 11101-11152 (2000), first enacted in 1986, codified Federal standards for medical peer review that provided limited immunity to committee members and made confidential documents submitted to a national physicians’ data bank. See id. Following passage of the Health Care Quality Improvement Act, the Legislature enacted laws and the Board of Registration in Medicine (board) promulgated regulations that progressively offered increased immunity for medical peer review committee members and witnesses and privilege against subpoena, discovery, and the use in *434evidence of documents related to medical peer review. See id. at 518-519. We have recognized that the intent of these confidentiality provisions is “[t]o ‘promote candor and confidentiality’ in the peer review process . . . and to ‘foster aggressive critiquing of medical care by the provider’s peers.’ ” Pardo v. General Hosp. Corp., 446 Mass. 1, 11 (2006), quoting Carr v. Howard, supra at 518, and Beth Israel Hosp. Ass’n v. Board of Registration in Med., supra at 182. To advance the Legislature’s purpose, we have reviewed the statutory medical peer review privilege broadly. See, e.g., Beth Israel Hosp. Ass’n v. Board of Registration in Med., supra (G. L. c. 111, § 204 [a], establishes “a broad privilege”).
Taken together, G. L. c. 111, §§ 204 (a) and 205 (b), provide weighty protection to a medical peer review committee’s work product and materials. They express the Legislature’s considered judgment that the quality of health care is best promoted by favoring candor in the medical peer review process. Necessarily, the interests of the general public in quality health care are elevated over the interest of individual health care professionals in unfettered access to information about peer review of their actions. See Carr v. Howard, supra at 532 (“the peer review privilege imposes some hardship on litigants seeking to discover information from hospital records, but the Legislature has clearly chosen to impose that burden on individual litigants in order to improve the medical peer review process generally”).
Nevertheless, the staff member at the center of the medical peer review process is not without recourse to ensure fairness. Medical peer review committees are required by Federal and State laws and regulations to provide medical personnel with notice and an opportunity to be heard about decisions of a peer review committee affecting them. See G. L. c. 111, § 203 (b); 42 U.S.C. § 11112(a)(3). Testimony from members of, or witnesses before, a medical peer review committee may be obtained “as to matters known to such persons independent of the committee’s proceedings.” G. L. c. 111, § 204 (c). See 243 Code Mass. Regs. § 304(4) (1994). Information “otherwise available from original sources” may be discoverable even if presented to a peer review committee. G. L. c. 111, § 204 (b). See also G. L. c. 111, §§ 204 (a), 205 (b).
*435The Legislature has permitted the subject of a medical peer review to pierce the statutory privilege to establish a cause of action against the member of a peer review committee for the member’s failure to act in good faith pursuant to G. L. c. 231, § 85N. We have recognized that the exception for failure to act in good faith must be construed narrowly to preserve the purposes of the peer review privilege to promote good health care. See Pardo v. General Hosp. Corp., supra at 10-11. Therefore, the exception operates to invade the peer review privilege only “on some threshold showing that a member of a medical peer review committee did not act in good faith in connection with his activities as a member of the committee, for example did not provide the medical peer review committee with a full and honest disclosure of all the relevant circumstances, but sought to mislead the committee in some manner.” Id at 11-12.
We now consider whether the judge properly ordered production of the disputed communications.
b. Credentialing communications. The judge ruled that credentialing communications concerning Vranos between the defendants and the board, the Vermont Board of Medical Practice, Brattleboro Memorial Hospital, and other credentialing organizations were not covered by the medical peer review privilege and must be produced. This was error.
First, the defendants’ communications to the board concerning Vranos’s conduct, including peer review materials, were not voluntary but rather mandated as part of the hospital’s obligation to participate in health care facility quality assessment and risk management programs. See, e.g., G. L. c. 111, § 53B; 243 Code Mass. Regs. § 2.07(17)(c) (1995) (“an essential element of a Patient Care Assessment Program pursuant to 243 [Code Mass. Regs. §§] 3.00, is that a reporting entity report any ‘disciplinary action’ to the Board relating to any employment practice, association for the purpose of providing patient care, or privileges”); G. L. c. 112, § 5F (“Any health care provider . . . shall report to the board any person who there is reasonable basis to believe is in violation of . . . any of the regulations of the board . . .”). These materials do not lose their character as “proceedings, reports and records” pursuant to *436G. L. c. 111, § 204 (a), or information and work product “necessary” to meet the hospital’s statutory risk management and quality assessment programs pursuant to G. L. c. 111, § 205 (b), merely because they are required to be furnished to the board. To hold otherwise would severely undermine the Legislature’s carefully constructed scheme to promote systemwide good health care, for the statutory obligation to report incidents of unprofessional physician behavior would render meaningless the incentives confidentiality and privilege offer to peer review committee members and witnesses to proceed in all candor. A similar analysis pertains to the credentialing documents the hospital was required to send to Brattleboro Memorial Hospital in response to its credentialing inquiry. Carr v. Howard, supra at 524-525. See 243 Code Mass. Regs. §§ 3.05, 3.12(1)(d) (1994).
Finally, although Massachusetts laws and regulations do not expressly require a health care facility to provide credentialing information to another State’s board of registration in medicine, we assume without deciding that applying the medical peer review privilege to such communications is also consistent with the Legislature’s intent to provide broad protection for candid assessments of a physician’s performance. See 243 Code Mass. Regs. § 3.01 (board regulations intended to promote “active self-scrutiny and reporting of adverse incidents in in-patient and out-patient settings to permit individual physicians, institutions and the Board to recognize patterns requiring corrective action”). See also Carr v. Howard, supra at 517-519; Beth Israel Hosp. Ass’n v. Board of Registration in Med., 401 Mass. 172, 182 (1987).
In short, the judge erred in designating the credentialing communications outside the scope of the medical peer review privilege.
c. Peer review privilege. We next address the order to produce the disputed peer review documents.16 We consider only whether the judge erred in concluding that these docu*437ments fell within the “single, narrow exception to the privilege ‘to establish’ that a member of a peer review committee did not act ‘in good faith and in the reasonable belief that based on all of the facts the action or inaction on his part was warranted’ during the peer review process.” Pardo v. General Hosp. Corp., supra at 11, citing G. L. c. 111, § 204 (b), and G. L. c. 231, § 85N. See id. at 12 n.24 (distinguishing claims for “bad faith” from claims for failure to act in “good faith”).17 The judge cited two pieces of “undisputed evidence” as “key” to his conclusion that the privilege should be abrogated. First, “there were circumstances attendant to the incident which suggest the possibility of ulterior motives on the part of Skinner” (emphases added), including the possibility of FMC losing revenue when Vranos switched hospitals, see note 12, supra, and Vranos’s signature on the memorandum of concern. Second, “the nature and vigor” of Skinner’s investigation of Vranos “indicates that Skinner may have used the peer-review process without the requisite good faith” (emphases added). These suspicions, as we shall explain, are insufficient to pierce the thick armor of the privilege.
As an initial matter, we note that Vranos did not in fact submit any evidence to support his discovery claims. His discovery argument rests on the claims that “[gjood faith was missing because Skinner’s animus was unrelated to [Vranos’s] professional qualities, which caused Skinner to purposefully avoid exculpatory facts about the incident and to avoid investigating *438the facts in a reasonable manner.” However, Vranos’s complaint was unverified, and unlike Skinner, he never submitted an affidavit to establish a factual foundation supporting his position. Thus, despite the judge’s reference to “the collective weight of the evidence” in favor of Vranos, any evidence before the judge was submitted by and in support of the defendants; the only evidence on the record was the uncontested testimony proffered in Skinner’s affidavit. In spite of this, the judge held in favor of the plaintiff’s conclusory and unverified statements. This reliance alone would be a ground to vacate the order.18
With specific reference to the medical peer review privilege, we have taken pains to emphasize that “mere inference” will not suffice to meet the movant’s burden to pierce the medical peer review privilege. Pardo v. General Hosp. Corp., supra at 12; Carr v. Howard, supra at 531 (privilege may not be pierced where plaintiff has provided “no contradictory evidence” to show that documents at issue are not mandated by board regulations). We have stressed that, to break through the medical peer review process, the moving party must show that the medical review process itself, and not the reasons for initiating it, was infected with lack of good faith. Pardo v. General Hosp. Corp., supra at 12 (“The focus must be on the committee member’s actions within the peer review committee process itself, not on possible discriminatory reasons for initiating a review of the plaintiff’s work” [emphasis added]). Thus, Vranos’s theory that the desire for vengeance motivated Skinner’s initiation of the investigation, which the judge accepted, is irrelevant. Vranos has failed to point to any evidence of misconduct within the peer review process (which, in fact, resulted in the lifting of Vranos’s summary suspension). See Pardo v. General Hosp. Corp., supra at 12-13, quoting Doe v. St. Joseph’s Hosp. of Fort Wayne, 42 Empl. Prac. Dec. (CCH) par. 36,973 (N.D. Ind. 1987) (“plaintiff must ‘allege facts which create more than a mere inference that the actions of the peer *439review committee were discriminatory, before the court will permit even an in camera inspection of the communications to, records of or determinations of the peer review committee’ ”).
Moreover, even if Vranos’s speculations were sufficient to meet his burden, which they are not, the conclusions drawn by the judge are far from self-evident. The judge, for example, concluded that Skinner’s initial investigation of the incident leading to Vranos’s summary suspension was “inadequate and somewhat arbitrary” because, under FMC’s bylaws, such a remedy (suspension) “seems to be intended” for “grave and immediate safety concerns.”19 In fact, FMC’s bylaws submitted to the judge as part of Skinner’s affidavit provide that summary suspension is appropriate “[t]o reduce the substantial likelihood of injury or damage to the health or safety of any patient, employee, or other person at [FMC]” and “[f]or the continued effective operation of [FMC].” It is also evident that summary suspension proceedings are necessarily conducted quickly and without the time for a thorough review of all evidence.20 We do not consider indicative of lack of good faith that Skinner, as FMC’s president, would act swiftly and decisively in response to a disruptive incident between two members of the FMC staff that had tremendous potential to disrupt the day-to-day operations of the entire institution.21 Finally, we note that Vranos *440knowingly declined to exercise his right to contest his temporary suspension to the trustees and cannot now rely on speculation to obtain information that might otherwise have been available to him.
The exceptions to the privilege urged by Vranos would decimate the efficacy of confidentiality protections in G. L. c. 111, § 204 (a), any time a plaintiff asserts an allegation of bad faith, which undoubtedly more plaintiffs would do if we accepted Vranos’s argument. “It does not seem reasonable that the Legislature would create a [peer review committee] privilege and through an exception undercut the confidentiality that that privilege allows.” Beth Israel Hosp. Ass’n v. Board of Registration in Med., 401 Mass. 172, 182 (1987).
3. Conclusion. For the foregoing reasons, the judge’s order is vacated, and the case is remanded for further proceedings consistent with our opinion.
So ordered.