*95The defendants, Scott Weiss, Norwalk Hospital (hospital), and Scott Brown, appeal following *96the trial court's granting *619in part of the motion filed by the plaintiff, David Simmons, to open a prior judgment that had been rendered against him. On appeal, the defendants claim that the trial court improperly opened the judgment more than four months after it was rendered when no exception to the timeliness requirement existed. We conclude that the trial court did not have the authority to open the judgment. Accordingly, we reverse the trial court's ruling on the motion to open and remand the case with direction to dismiss the motion to open.
The following facts and procedural history are relevant to our review of the defendants' claim. This medical malpractice action arose from a surgery in which Weiss, a podiatrist, amputated two of the plaintiff's toes. According to the plaintiff, Weiss, without "any real examination," recommended the amputation of the plaintiff's right foot, to which the plaintiff responded that amputation was unnecessary. Instead, the plaintiff underwent two surgeries at the hospital to open, scrape, and flush his right foot, both of which were performed by Weiss. During the second surgery, Weiss "amputated [two] noninfected perfectly normal toes." Brown is a physician's assistant who was an employee of the hospital at the time of the surgeries and who provided medical care to the plaintiff while he was an in patient at the hospital. The plaintiff, thereafter, brought this action against the defendants.
On November 21, 2014, the hospital and Brown moved to dismiss the action pursuant to General Statutes § 52-190a1 on the ground that the plaintiff had failed *97to obtain and file a written opinion of a similar health care provider. On November 25, 2014, Weiss filed a motion to dismiss on the same ground. On February 23, 2015, the trial court, Lee, J. , granted the motion to dismiss filed by Weiss, and, on March 2, 2015, it granted the motion to dismiss filed by the hospital and Brown. The trial court thereafter rendered judgment dismissing the action. The plaintiff did not appeal from that judgment.
On July 10, 2015, the plaintiff filed a motion to open the judgment of dismissal on the grounds of "[l]ack of legal assistance and ... poor [response] from defense [attorney's] office," to which the defendants objected. On September 8, 2015, the trial court, Povodator, J. , issued an order in which it stated, sua sponte, that the defendants' motions to dismiss improperly had been granted by Judge Lee because the plaintiff's complaint included a claim for lack of informed consent, which exists outside the scope of § 52-190a, and, therefore, the motions to dismiss should have been applicable only to part of the complaint. Consequently, Judge Povodator ordered the defendants to brief the issue of whether Judge Lee erred in granting the motions to dismiss the entire complaint, with which the defendants complied.
On November 24, 2015, Judge Povodator issued a memorandum of decision in which he ordered that "the motion to open the judgment is granted in part, limited to the claims of the plaintiff asserting lack of consent and/or lack of informed consent, i.e., issues fairly within the scope of the complaint but not asserting medical negligence. The motion is denied with respect *620to the claims of medical negligence, for which § 52-190a is *98applicable." Thereafter, Weiss, and Brown and the hospital filed separate appeals with this court. Additional facts will be set forth as necessary.
As a threshold matter, we must first determine whether we have jurisdiction over the appeals. "Ordinarily, the granting of a motion to open a prior judgment is not a final judgment, and, therefore, not immediately appealable. ... Our Supreme Court, however, has carved out an exception to that rule where a colorable claim is made that the trial court lacked the power to open a judgment." (Internal quotation marks omitted.) Nelson v. Charlesworth , 82 Conn.App. 710, 712, 846 A.2d 923 (2004). The defendants argue that General Statutes § 52-212a bars a trial court from opening a judgment after four months, absent a common-law exception. They further argue that, in the present action, Judge Povodator did not make a finding of any of the common-law exceptions upon which he relied to open the judgment of dismissal. Consequently, they argue, the trial court lacked the authority to open the judgment after the four month period had expired. As the defendants' claim is a colorable claim that the trial court lacked the authority to open the judgment, we have jurisdiction over the appeals.
We next set forth our standard of review and relevant law. "Whether proceeding under the common law or a statute, the action of a trial court in granting or refusing an application to open a judgment is, generally, within the judicial discretion of such court, and its action will not be disturbed on appeal unless it clearly appears that the trial court has abused its discretion." (Internal quotation marks omitted.) Id., at 713, 846 A.2d 923.
"[Section] 52-212a provides in relevant part: 'Unless otherwise provided by law and except in such cases in which the court has continuing jurisdiction, a civil judgment or decree rendered in the Superior Court may *99not be opened or set aside unless a motion to open or set aside is filed within four months following the date on which it was rendered or passed. ...' Practice Book § 17-43 contains similar language. Courts have interpreted the phrase, '[u]nless otherwise provided by law,' as preserving the common-law authority of a court to open a judgment after the four month period." Id., at 713-14, 846 A.2d 923. It is well established that "[c]ourts have intrinsic powers, independent of statutory provisions authorizing the opening of judgments, to vacate [or open] any judgment obtained by fraud, duress or mutual mistake." In re Baby Girl B. , 224 Conn. 263, 283, 618 A.2d 1 (1992).
In the present case, on February 23, 2015, the court granted Weiss' motion to dismiss, and it issued judicial notice of that decision on February 27, 2015. Therefore, the four month period within which the plaintiff had to file his motion to open expired on Monday, *621June 29, 2015.2 The plaintiff, however, filed the motion to open on July 10, 2015. This is beyond the four month period in which the plaintiff properly could have filed a motion to open a judgment without an applicable exception. See Practice Book § 17-4.
Similarly, on March 2, 2015, the court granted the motion to dismiss filed on behalf of the hospital and Brown, and it issued judicial notice of that decision on March 4, 2015. Therefore, the four month period within which the plaintiff had to file his motion to open expired on Monday, July 6, 2015.3 The plaintiff, however, filed the motion to open on July 10, 2015, which is beyond the four month period in which the plaintiff properly could have filed a motion to open a judgment without *100an applicable exception. See Practice Book § 17-4. Thus, because the plaintiff filed his motion to open beyond the requisite four month time restriction, Judge Povodator would have had the authority to open the judgment of dismissal only if one of the exceptions to the four month period was applicable. Accordingly, we now turn to the exceptions to § 52-212a.
The exceptions to § 52-212a that authorize a trial court to open a judgment when the four month period has expired are fraud, duress, and mutual mistake.4 See, e.g., In re Baby Girl B. , supra, 224 Conn. at 283, 618 A.2d 1. The plaintiff neither claimed nor attempted to prove the existence of any one of these exceptions when he filed his motion to open the judgment of dismissal. See Trumbull v. Palmer , 123 Conn.App. 244, 257, 1 A.3d 1121 (burden of proof in motion to open is on moving party), cert. denied, 299 Conn. 907, 10 A.3d 526 (2010). Also, Judge Povodator did not make a finding that any of these exceptions applied. Consequently, Judge Povodator was without authority to open the judgment pursuant to § 52-212a.
Notwithstanding the foregoing, however, and relying primarily on our decision in Connecticut Savings Bank v. Obenauf , 59 Conn.App. 351, 758 A.2d 363 (2000), Judge Povodator concluded that compelling equitable circumstances required the court to rectify an injustice by opening the judgment.5 In *101Connecticut Savings Bank , we held that it was proper to open a judgment seven years after it was rendered because the judgment was facially inconsistent with the complaint. Id., at 355-56, 758 A.2d 363. In that case, the plaintiff obtained a money judgment against a defendant where that defendant was the transferee in a fraudulent conveyance action. The judgment violated Connecticut law at the time, which provided that "a successful claim of fraudulent conveyance could not result in a judgment of liability against the transferee, joint and several or otherwise, on the underlying debt obligations owed by the transferor." Id., at 355, 758 A.2d 363. Thus, we concluded that "[t]o allow the plaintiff to benefit from a judgment against the defendant in excess of $41,000 that was contrary to law at the time of its rendition 'shocks the *622judicial conscience' ... and violates the principles of equity that govern our application of the law." (Citations omitted.) Id., at 357, 758 A.2d 363.
The circumstances of this present case do not rise to the level of deception presented in Connecticut Savings Bank . According to Judge Povodator, the compelling equitable circumstances in the present case were that the defendants had misled Judge Lee, and, as a result, Judge Lee rendered a judgment that was erroneous. Specifically, Judge Povodator stated that he was "troubled by the seeming lack of forthrightness [by the defendants' counsel] with the court about the nature of the claims and the applicability of § 52-190a." Moreover, he found that by characterizing the entire claim as one of medical malpractice, the defendants' counsel led to the "distortion of adjudication ...." In essence, Judge Povodator suggested that the defendants misstated the *102law with regard to § 52-190a (c) and, consequently, led Judge Lee to treat the one count complaint solely as a medical malpractice claim rather than as two separate claims of medical malpractice and lack of consent, each requiring separate legal analysis. In Judge Povodator's view, these "equitably compelling circumstances," which appear to be based on his conclusion that the defendants perpetrated a fraud upon the court, were sufficiently compelling to constitute an injustice and thus supported the opening of the judgment.
We do not agree with Judge Povodator. First, we do not agree that the defendants presented the case in such a manner that it was deceptive or inconsistent with the complaint. Indeed, the complaint was not a model of clarity but certainly included claims of medical malpractice without the requisite § 52-190a letter. Because the complaint lacked that letter, neither the filing nor granting of a motion to dismiss the complaint on that basis was a violation of the law or an injustice. See Rios v. CCMC Corp. , 106 Conn.App. 810, 822, 943 A.2d 544 (2008) ; see also Votre v. County Obstetrics & Gynecology Group, P.C. , 113 Conn.App. 569, 580-81, 966 A.2d 813, cert. denied, 292 Conn. 911, 973 A.2d 661 (2009).
Second, with respect to the fact that there may have been lack of consent or lack of informed consent claims included in the complaint, given that Judge Lee would have been able to view the operative complaint himself before deciding the motions to dismiss, it is unclear to this court on appeal how the defendants deceived Judge Lee or suppressed the truth regarding what claims were being presented in the complaint. Judge Lee dismissed the complaint because it failed to comply with § 52-190a. The fact that other claims may have been in the complaint does not make the dismissal of the action manifestly unjust. Indeed, § 52-190a (c) provides in relevant part that "failure to obtain and file the written *103opinion letter ... shall be grounds for dismissal of the action ."6 (Emphasis *623added.) This simply is not a case in which the original judgment is facially inconsistent with the complaint such that Judge Lee's decision to dismiss the complaint shocks the conscience. Consequently, we do not find that an injustice occurred in connection with the original judgment of dismissal that violates the principles of equity and, thus, justifies Judge Povodator's opening of the judgment.
Absent equitably compelling circumstances, Judge Povodator's only ground for opening the judgment of dismissal was that Judge Lee improperly had dismissed the action in full, when the complaint actually contained two claims, one for medical malpractice and one for lack of informed consent, and, therefore, two separate legal analyses were required when considering the motions to dismiss. Opening a judgment on such a ground, after the expiration of a four month period, however, is beyond the authority of the trial court. "After the expiration of the four month period ... a judgment may not be vacated [or opened] upon the sole ground that it is erroneous in matter of law, except by a court exercising appellate or revisory jurisdiction, *104unless such action is authorized by statute or unless the error is one going to the jurisdiction of the court rendering the judgment." (Internal quotation marks omitted.) Gallagher v. Gallagher , 29 Conn.App. 482, 483-84, 616 A.2d 281 (1992).
Here, the four month period had expired when the plaintiff filed his motion to open. The trial court, therefore, did not have the authority to open the judgment unless an exception applied. The trial court, however, opened the judgment on the basis that Judge Lee's judgment of dismissal was erroneous as a matter of law. This, however, is not an exception to the four month rule. As such, the trial court exceeded its authority and improperly granted in part the plaintiff's motion to open.
The form of the judgment is improper, the trial court's ruling on the plaintiff's motion to open the judgment is reversed, and the case is remanded with direction to dismiss the motion to open.
In this opinion the other judges concurred.