Dickson, C.J.
In this medical malpractice action the plaintiffs, Mary Alice Manley and Gary Manley, appeal from a grant of summary judgment in favor of the defendants, Dr. Ryan Sherer and Sherer Family Medicine, P.C. We reverse.
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In the present case, the defendants’ motion for summary judgment primarily asserts that the plaintiffs’ action was not timely commenced in accordance with the Indiana Medical Malpractice Act, which requires claims to be filed within two years of the allegedly negligent act, omission, or neglect. Ind. Code § 34-18-7-1(b). The defendants claim that the last possible alleged act of malpractice occurred on November 21, 2006, when Ms. Zehr last visited Dr. Sherer, and that because the plaintiffs’ proposed complaint was not filed until November 25, 2008, more than two years later, it was untimely. In the defendants’ additional trial court brief in support of their motion for summary judgment, they further argue that the medical malpractice statute of limitation bars this action because the plaintiffs filed their proposed complaint with the Department of Insurance but at no time did they ever file their complaint in court. [Footnote omitted.] In addition to asserting their statute of limitation defenses, the defendants also seek summary judgment on the alternative claim that undisputed facts establish that the alleged failure of Dr. Sherer to warn Ms. Zehr against driving could not have been the proximate cause of the ensuing collision. Opposing the defendants’ motion for summary judgment, the plaintiffs argue that the Medical Malpractice Act does not apply to their claim because Ms. Manley was not a patient of Dr. Sherer, and thus the plaintiffs’ claim is not one for medical malpractice subject to the special occurrence-based statute of limitation. As to the defendants’ claim regarding proximate causation, the plaintiffs contend that the foreseeability component of proximate cause is a question of fact in this case.
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With respect to the statute of limitation issue, we find that the defendants are not entitled to summary judgment. When a defendant in a medical malpractice action asserts the statute of limitation as an affirmative defense, the defendant bears the burden of establishing that the action was commenced outside that statutory period. Boggs v. Tri-State Radiology, Inc., 730 N.E.2d 692, 695 (Ind. 2000). Here, the defendants have established that the plaintiffs did not file the action until November 25, 2008, four days after the two-year medical malpractice statute of limitation had run. But this is not the end of the inquiry. Once the defendant has established that the action was filed outside the statute of limitation, the burden shifts to the plaintiff to establish “an issue of fact material to a theory that avoids the defense.” Id. Here, the designated evidence establishes such a rebuttal to the defense, namely, that there are genuine issues of fact as to the trigger date of the plaintiffs’ malpractice claim and thus whether or not it was “reasonably possible for [them] to present the claim in the time remaining after discovery and before the end of the statutory period.” Booth v. Wiley, 839 N.E.2d 1168, 1172 (Ind. 2005).
In order for the date to be triggered, our case law requires that a plaintiff be aware of “facts that, in the exercise of reasonable diligence, should lead to the discovery of the malpractice and the resulting injury.” Id. at 1171 (quoting Van Dusen v. Stotts, 712 N.E.2d 491, 497 (Ind. 1999)); see also Herron v. Anigbo, 897 N.E.2d 444, 448–51 (Ind. 2008) (discussing the triggering of an occurrence-based limitation period). The defendants argue on appeal that the running of the statutory limitation period was triggered when Ms. Manley overheard Ms. Zehr’s statement at the scene of the accident “that she should not be driving because of her medical condition.” Appellants’ App’x at 24. This vague statement overheard by Ms. Manley at the scene of the accident could suggest a bevy of possibilities wholly unrelated to and not reasonably suggestive of a doctor’s failure to warn about side effects of prescribed medication. While there is no evidence to so suggest, even if Ms. Manley had suspected that malpractice was a potential issue at the time the statement was made by Ms. Zehr, we have found in the past that mere suspicion is not enough. Van Dusen, 712 N.E.2d at 499 (“In general . . . a plaintiff’s lay suspicion that there may have been malpractice is not sufficient to trigger the two-year period. At the same time, a plaintiff need not know with certainty that malpractice caused his injury, to trigger the running of the statutory time period.” (citation omitted)).
The plaintiffs put forth an alternative trigger date, specifically, the date that Ms. Manley received a copy of the letter sent to the Orange County Prosecuting Attorney by Dr. Sherer, identifying himself as Ms. Zehr’s primary care physician, which stated, “I feel that [Ms. Zehr’s] medical conditions and medications combined to cause this problem.” Appellants’ App’x at 125. The plaintiffs reasonably contend that it was not until this point that they possessed knowledge of the facts necessary to investigate Ms. Zehr’s medical history and discover the alleged malpractice. However, because the letter is undated, it is unknown on what date the letter came to the attention of the plaintiffs. It is thus indiscernible whether the plaintiffs could have pursued their mal-practice claim within the two-year statutory limit, or, if not, whether they acted within a reasonable time as required by our caselaw. Booth, 839 N.E.2d at 1172 (“[I]f the discovery date is with-in two years following the occurrence of the alleged malpractice, . . . the action must be initiated before the period expires, unless it is not reasonably possible for the claimant to present the claim in the time remaining after discovery and before the end of the statutory period.” (emphasis added)).
We find from the designated evidence that there exists “an issue of fact material to a theory that avoids the defense,” Boggs, 730 N.E.2d at 695, which serves to rebut the defendants’ affirmative defense. “[F]actual issues relating to the running of the limitations period, such as the date on which the plaintiff first learns of the injury, are to be resolved by the trier of fact at trial.” Herron, 897 N.E.2d at 452. Because we must construe the facts favorably to the plaintiffs as the non-moving party, we conclude that Ms. Manley overhearing Ms. Zehr’s accident-scene remark is insufficient to conclusively establish the trigger date for the limitation period of the Medical Malpractice Act and that there remains a genuine issue of material fact as to both the trigger date and, if within the two-year limitation period, whether the plaintiffs filed their complaint within a reasonable time. The defendants are not entitled to summary judgment on their statute of limitation defense.
We also find no merit in the defendants’ claim that the plaintiffs’ filing of their proposed complaint with the Department of Insurance was insufficient to commence this action within the statutory limitation period. Indiana Code Section 34-18-7-3 explicitly declares, to the contrary, that such filing of a proposed complaint “tolls the applicable statute of limitations.” Ind. Code § 34-18-7-3(a). And a proposed complaint “is considered filed” when a copy is delivered or mailed to the Commissioner of Insurance. Id. § 34-18-7-3(b); see also Jordan v. Deery, 609 N.E.2d 1104, 1107 (Ind. 1993) (“[T]he running of a limitation period is suspended for the period of time from the date of filing the proposed complaint until ninety days following receipt of the panel opinion.”); Miller v. Terre Haute Reg’l Hosp., 603 N.E.2d 861, 863 (Ind. 1992) (“This Court held [in Guinn v. Light, 558 N.E.2d 821 (Ind. 1990),] that the filing of a proposed com-plaint against a health care provider with the Department tolls the statute of limitations until the parties are informed that the provider has not qualified under the Act.”).
We further find that summary judgment is likewise improper as to the defendants’ alternate summary judgment claim asserting lack of causation as a matter of law. The defendants urge that the undisputed facts demonstrate, (a) that the alleged failure of Dr. Sherer to warn Ms. Zehr could not have been the proximate cause of the ensuing collision because Ms. Zehr continued to drive after the collision, thus demonstrating that she would have ignored any warning from Dr. Sherer, and (b) that Ms. Zehr’s choice to drive despite knowing that she “should not be driving” constitutes a superseding cause, thus establishing a lack of the necessary element of causation. Both of these contentions rest on uncertain facts and inferences—genuine issues of material fact—that preclude judgment for the defendants as a matter of law. To obtain summary judgment, a moving party must affirmatively dispel all determinative genuine issues of material fact. It is not enough to cite the absence of evidence and claim that the non-moving party is thereby unable to prove an element of its case. Rather, the moving party must demonstrate that the undisputed facts conclusively establish the absence of a required element of the non-moving party’s case. The defendants did not meet this burden as to the issue of causation.
Finding genuine issues of material fact (1) as to when the plaintiffs either, (a) knew of the alleged malpractice, or (b) learned of facts that, in the exercise of reasonable diligence, should lead to the discovery of the malpractice and resulting injury; and (2) as to the absence of the element of causation necessary to establish liability, we conclude that the defendants’ motion for summary judgment should have been denied. The judgment of the trial court is therefore re-versed and this cause remanded for further proceedings.
Rucker, David, Massa, and Rush, JJ., concur.