DISSENTING OPINION BY
STEVENS, J.:¶ 1 After careful review, I conclude that Appellants George and Caroline Bourne waived the issue of whether the trial court correctly applied Pa.R.C.P. 1042.3(d) and its tolling provision. Therefore, it is unnecessary to review the merits of the issue, and I would not reverse and remand on this basis. In addition, I conclude no relief is due regarding Appellants’ two remaining contentions. As I would affirm the trial court’s order denying Appellants’ petition to open and/or strike the judgment of non pros, I respectfully dissent.
¶2 Appellants contend the trial court erred in failing to strike the judgment of non pros because Appellants had filed a timely motion to extend the period of time within which to file a certificate of merit, which filing tolled the running of the 60-day period provided in Pa.R.C.P. 1042.3. *118The Majority concludes there is merit to Appellants’ contention and reverse and remand on this basis. However, I conclude the issue is waived.
¶ 3 In addressing the tolling provision in its Pa.R.A.P.1925(a) opinion, the trial court suggests Appellants did not present this specific issue in their petition to open and/or strike or in their two supporting briefs. The single arguable reference Appellants made to the tolling provision of Rule 1042.3(d) is as follows:
8. Plaintiffs continued to pursue a written statement from a licensed physician to further buttress the underlying action. Plaintiffs continued this search under the protection of its Motion for Extension of Time to File Certificate of Merit, which stayed the 60 day period for filing a certificate of merit according to Rule 1042.3 of the Pennsylvania Rules of Civil Procedure.
¶ 4 This bald assertion was insufficient to place the trial court on notice as to Appellants’ proposed interpretation of Rule 1042.3(d). It is also well-settled that Appellants cannot advance new theories for relief on appeal. See Pa.R.A.P. 302(a). Moreover, Appellants subsequently stated in one of their briefs that they acknowledge they failed to file a Certificate of Merit within sixty (60) days as required by Rule 1042.3(a). Appellants did not develop this argument in the court below, raising it for the first time on appeal; thus, this issue has been waived. Pa.R.A.P. 302(a). Therefore, the Majority should not have discussed the merits of the issue. As I find this issue has been waived, I must dissent.
¶ 5 Appellants’ next. contention is that the trial court erred in denying their motion for an extension of time in which to file certificates of merit since they established good cause for needing an extension, and the trial court should have granted Appellants’ petition to open the judgment of non pros. Specifically, Appellants contend that, despite their diligent efforts, Temple University Hospital and Dr. Ber-man failed to provide Appellants with all of the requested, relevant medical records, and, therefore, the validity of their medical malpractice claims could not be properly evaluated by an appropriate expert.
When reviewing the denial of a petition to strike and/or open a judgment of non pros, we will reverse the trial court only if we find a manifest abuse of discretion. “It is well-established that a motion to strike off a judgment of non pros challenges only defects appearing on the face of the record and that such a motion may not be granted if the record is self-sustaining.” Additionally, the rule governing relief from judgment of non pros indicates in pertinent part:
(b) If the relief sought includes the opening of the judgment, the petition shall allege facts showing that
(1) the petition is timely filed,
(2) there is a reasonable explanation or legitimate excuse for the inactivity or delay, and
(3) there is a meritorious cause of action.
Varner v. Classic Communities Corp., 890 A.2d 1068, 1072 (Pa.Super.2006) (citation and quotations omitted).6 See Pa.R.C.P. *1193051 (relating to relief from judgment of non pros).7 Once a judgment of non pros has been entered, the burden rests on the former plaintiff to demonstrate that there is good cause for reactivating the case. See Womer v. Hilliker, 589 Pa. 256, 908 A.2d 269 (2006).
¶ 6 Resolution of the case sub judice requires us to review the Pennsylvania Rules of Civil Procedure regarding the filing of certificates of merit in professional liability cases. Specifically, Pa.R.C.P. 1042.3 provides, in relevant part, the following:
Rule 1042.3. Certificates of Merit
(a) In any action based upon an allegation that a licensed professional deviated from an acceptable professional standard, the attorney for the plaintiff, or the plaintiff if not represented, shall file with the complaint or within sixty days after the filing of the complaint, a certificate of merit signed by the attorney or party that either
(1)an appropriate licensed professional has supplied a written statement that there exists a reasonable probability that the care, skill or knowledge exercised or exhibited in the treatment, practice or work that is the subject of the complaint, fell outside acceptable professional standards and that such conduct was a cause in bringing about the harm, or
Note: It is not required that the “appropriate licensed professional” who supplies the necessary statement in support of a certificate of merit required by subdivision (a)(1) be the same person who will actually testify at trial. It is required, however, that the “appropriate licensed professional” who supplies such a statement be an expert with sufficient education, training, knowledge and experience to provide credible, competent testimony, or stated another way, the expert who supplies the statement must have qualifications such that the trial court would find them sufficient to allow that expert to testify at trial. For example, in a medical professional liability action against a physician, the expert who provides the statement in support of a certificate of merit should meet the qualifications set forth in Section 512 of the Medical Care Availability and Reduction of Error (MCARE) Act, 40 P.S. 1303.512.
(2) the claim that the defendant deviated from an acceptable professional standard is based solely on allegations that other licensed professionals for whom this defendant is responsible deviated from an acceptable professional standard, or
* * *
(3) expert testimony of an appropriate licensed professional is unnecessary for prosecution of the claim.
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(d) The court, upon good cause shown, shall extend the time for filing a certificate of merit for a period not to exceed sixty days. The motion to extend the time for filing a certificate of merit must be filed on or before the filing date that the plaintiff seeks to extend. The filing of a motion to extend tolls the time period within which a certificate of merit must be *120filed until the court rules upon the motion.
Note: There are no restrictions on the number of orders that a court may enter extending the time for filing a certificate of merit provided that each order is entered pursuant to a new motion, timely filed and based on cause shown as of the date of filing the new motion.
The moving party must act with reasonable diligence to see that the motion is promptly presented to the court if required by local practice.
In ruling upon a motion to extend time, the court shall give appropriate consideration to the practicalities of securing expert review. There is a basis for granting an extension of time within which to file the certificate of merit if counsel for the plaintiff was first contacted shortly before the statute of limitation was about to expire, or if, despite diligent efforts by counsel, records necessary to review the validity of the claim are not available.
Pa.R.C.P. 1042.3(a)(1), (2), (3), (d) (emphasis in original and added). Although the Rules of Civil Procedure do not define the term “diligent,” the term is commonly defined as “characterized by steady, earnest, and energetic efforts.” Merriam Webster’s Collegiate Dictionary 325 (10th ed. 1993). See Pa.R.C.P. 103(a) (“Words and phrases shall be construed according to rules of grammar and according to their common and approved usage....”).
¶ 7 Regarding the consequence of not fifing timely certificates of merit, Pa. R.C.P. 1042.6, provides the following:
Rule 1042.6. Entry of Judgment of Non Pros for Failure to File Certification
(a) The prothonotary, on praecipe of the defendant, shall enter a judgment of non pros against the plaintiff for failure to file a certificate of merit within the required time provided that there is no pending timely filed motion seeking to extend the time to file the certificate.
Note: The prothonotary may not enter judgment if the certificate of merit has been filed prior to the fifing of the praecipe....
Pa.R.C.P. 1042.6(a) (emphasis in original).
¶ 8 In resolving this issue, focus is on Subsection (d) of Rule 1042.3. Specifically, the issue presented is whether Appellants exercised diligent efforts to secure Mr. Berman’s medical records,8 thereby demonstrating “good cause” warranting an extension of time. I conclude that they did not.
¶ 9 It is undisputed that Appellants paid $1,302.97 for the cost of reproducing Mr. Berman’s medical records, that Appellants received some medical records in March or April of 2005, and that Appellants forwarded the medical records to potential experts for review. At some point, Appellants’ potential experts contacted Appellants and informed them the voluminous medical records9 were incomplete. Thereafter, even though opposing counsel entered his appearance on August 12, 2005, Appellants sent letters dated September 1, 2005 and October 24, 2005 directly to “Darlene” at Temple University Hospital. In response, Temple University Hospital indicated they were unable to *121send any medical records to Appellants because they were involved in litigation. Appellants still did not contact opposing counsel. In fact, as of the time of filing their motion for an extension of time on November 2, 2005, Appellants neither contacted opposing counsel to inform him of the missing medical records nor sought formal discovery under the Rules of Civil Procedure.10 The only effort Appellants made in securing the missing medical records was, as stated, to informally contact one of the named defendants, who was represented by counsel. I conclude such “efforts” violated Pennsylvania Rule of Professional Conduct 4.2, which prohibits a lawyer from communicating with a party the lawyer knows to be represented by another lawyer. As the trial court succinctly stated:
“Good cause” cannot be read to exist where [Appellants] fail to make use of procedures available vise-a-vie the discovery rules. Once litigation ensues any reasonable attempt to gain access to medical records in a medical malpractice action begins with use of the court’s subpoena powers. A party’s written request directly to an opponent who is represented by counsel does not meet the diligent efforts standard.
Trial Court Opinion filed 9/1/06 at 3.
¶ 10 Anticipating that there was no abuse of discretion in the trial court’s ruling on this issue, and conceding that Appellants could have employed formal discovery procedures to compel Temple University Hospital to turn over any missing medical records, Appellants requested this Court to overlook their attorney’s inaction as an equitable exception to Pa.R.C.P. 1042.3. However, I conclude this specific argument was not raised in the trial court; but rather, was advanced for the first time on appeal. See Pa.R.A.P. 302(a). Also, the specific issue was not included in Appellants’ court-ordered Pa.R.A.P.1925(b) statement. See Karn , supra. Therefore, I would find this contention to be waived.
¶ 11 Appellants’ final contention is that the trial court erred in denying their petition to open the judgment of non pros since, as of November 11, 2005, Appellants had a certificate of merit from Elisabeth Ridgley, R.N. but just neglected to file such within sixty days. Essentially, Appellants argue the only deficiency in this case was a lack of notice with regard to a valid certificate of merit and, since the rules of civil procedure are to be liberally construed under Pa.R.C.P. 126, equity required the trial court to open the judgment of non pros.
¶ 12 It is well settled that all issues must be raised in a timely, court-ordered Pa. R.A.P.1925(b) statement and the failure to raise a particular issue will result in waiver of the claim on appeal. See id. In the case sub judice, Appellants’ Pa.R.A.P. 1925(b) statement makes no reference to Appellants’ specific issue, and therefore, I would find this issue to be waived. The fact Appellants vaguely alleged in their Pa.R.A.P.1925(b) statement that “This Honorable Court committed an error in denying Appellants’ Petition to Open and/or Strike Judgment of Non Pros from which Order said Appeal has been taken,” *122does not alter my waiver analysis. It is well-settled that “a Concise Statement which is too vague to allow the court to identify the issues raised on appeal is the functional equivalent of no Concise Statement at all.” Id. at 335 (quotation omitted).
¶ 13 In light of the foregoing, I would affirm the trial court’s order, and therefore, I respectfully dissent.
. I note that whether Appellants had a legitimate excuse for failing to file a timely certificate of merit relates to the second prong enunciated supra. Regarding the first prong, no one disputes that Appellants timely filed their petition to open and/or strike the judgment of non pros. Regarding the final prong, Appellants proffer that a certificate of merit they procured from a registered nurse creates a presumption that they have a meritorious cause of action. See Appellant’s Brief at 21-22.. Appellants’ contention regarding the fi*119nal prong was not raised in their court-ordered Pa.R.A.P. 1925(b) statement, and therefore, it has been waived. See Karn v. Quick & Reilly Inc., 912 A.2d 329 (Pa.Super.2006).
. This Court has held that a plaintiff may seek relief under Pa.R.C.P. 3051 for relief from a judgment of non pros entered pursuant to Pa.R.C.P. 1042.6. Ditch v. Waynesboro Hosp., 917 A.2d 317 (Pa.Super.2007).
. The trial court concluded Appellants never received all of Mr. Bourne’s medical records. Trial Court Opinion filed 9/1/06 at 3. Furthermore, the trial court apparently concluded such records were "necessary to review the validity of the claim.” Pa.R.C.P. 1042.3(d) Note. We find no abuse of discretion in this regard.
. Temple University Hospital and Dr. Berman do not dispute that Appellants were sent approximately 3,793 pages of medical records.
. Pa.R.C.P. 1042.5 provides that a party may seek the production of documents prior to the filing of a certificate of merit. Moreover, Pa.R.C.P. 4009.1 provides, in relevant part, that:
Any party may serve a request upon a party pursuant to Rules 4009.11 and 4009.12 ... to produce and permit the requesting party, or someone acting on the party’s behalf, to inspect and copy any designated documents ... which are in the possession, custody or control of the party or person upon whom the request or subpoena is served....