Opinion for the court filed by Circuit Judge GARLAND.

The appellant, an adult male who is a committed ward of the District of Columbia Mental Retardation and Developmental Disabilities Administration (MRDDA), appeals from a district court order requiring MRDDA to produce all of his records to counsel for plaintiffs who are suing MRDDA and the District. We conclude that the court abused its discretion by ordering production of the records without determining whether any are subject to the federal psychotherapist privilege recognized in Jaffee v. Redmond, 518 U.S. 1, 116 S.Ct. 1923, 135 L.Ed.2d 337 (1996), and without weighing the probative value of the non-privileged records against the extent of the intrusion into the appellant’s legitimate privacy interests. We therefore vacate the order and remand for further proceedings.

I

The plaintiffs in the district court — the appellees here —• are “two mentally retarded adult men” who are “wards of the District of Columbia government” and for whose care and well-being MRDDA is responsible. Compl. ¶¶ 1, 9. For several years during the 1990s they lived in a residential group home at 2303 Minnesota Avenue, S.E. The appellant here also is a “mentally retarded adult” man and “committed ward” of the District. Appellant’s Br. at 1. He lived in the -same group home beginning in mid-1997.

According to the complaint, the appellant sexually assaulted the plaintiffs at the group home. Compl. ¶¶ 12, 15. The complaint further alleges that, although the resident director of the facility notified District officials of those assaults, the District did nothing to protect the plaintiffs until it moved the appellant to another facility on August 31, 1998. ' The plaintiffs seek damages from the District under 42 U.S.C. § 1983 for violating their civil rights, and under various District of Columbia causes of action, including negligence. 1 The complaint asserts that the district court has federal question jurisdiction over the § 1983 claim, see Compl. ¶ 2 (citing 28 U.S.C. § 1331), and supplemental jurisdiction over the local law claims, id. (citing 28 U.S.C. § 1367(a)).

During pre-trial proceedings, the plaintiffs moved to compel production of the *1208 District of Columbia’s “complete files” on the appellant. The District took no position on whether the files should be produced, either at that time or subsequently. On October 11, 2002, the district court granted the motion, directing that “the files of [appellant] shall be produced for inspection by the plaintiffs’ counsel,” and requiring that they be “treated as confidential” and used “only ... in connection with this litigation.” Order, No. 02-401 (D.D.C. Oct. 11, 2002) (hereinafter October 2002 Order).

Thereafter, the appellant’s guardian ad litem, appointed by the Superior Court of the District of Columbia, entered a special appearance to represent the appellant in connection with the requests for his “medical and ward files.” Objecting to the breadth of the district court’s discovery order, and contending that the documents were subject to a number of privileges, the guardian filed a motion for reconsideration and for a more extensive protective order pursuant to Federal Rule of Civil Procedure 26(c). Unconsented Mot. for Ct. to Reconsider at 1. On February 14, 2003, the district court denied the motion to reconsider and ordered that “defendant District of Columbia shall produce the relevant medical records of [appellant] to plaintiffs’ counsel in accordance with the prior Order of this Court....” Order, No. 02-401 (D.D.C. Feb. 14, 2003) (hereinafter February 2003 Order).

The plaintiffs then asked the court for clarification, contending that the District should produce the appellant’s “entire file,” regardless of whether the records were “relevant” or “medical.” 5/15/03 Tr. at 3, 4, 12. At a hearing conducted on May 15, 2003, the plaintiffs insisted that they were “entitled to receive any documents that might reasonably lead to the discovery of admissible evidence,” and that they did not “want someone else saying, Well, we don’t think this is relevant when we might in fact think it is relevant.” Id. at 12. The appellant’s guardian objected on the ground that some of the documents were privileged and confidential, and that the court had not weighed the plaintiffs’ interest in the documents against the appellant’s privacy interest. Id. at 5-11. The court nonetheless granted the plaintiffs’ request and directed that their counsel be allowed “to review the entire file and to tab those records that he believes will serve his evidentiary purposes in connection with this case.” Id. at 15. The court further instructed plaintiffs’ counsel to prepare a written order, which the court entered on August 7, 2003. The order stated:

[Tjhe mental retardation records of [appellant], including medical records and case notes, in the possession of defendant District of Columbia [shall] be made available to counsel for plaintiffs for review. Counsel for plaintiffs shall designate which records are to be produced in connection with this case....

Order at 1-2, No. 02-401 (D.D.C. Aug. 7, 2003) (hereinafter August 2003 Order).

The appellant, through his guardian ad litem, appealed the August 2003 Order requiring production of his MRDDA files. 2 On October 28, 2003, another panel of this court granted a stay of production pending appeal. We now consider the issues raised by the appellant.

*1209 II

We begin with a question of appellate jurisdiction. Plaintiffs-appellees contend that we lack jurisdiction because the district court’s order was merely an interlocutory discovery order, rather than a final order subject to our review pursuant to 28 U.S.C. § 1291. Ordinarily, a decision is not considered final under § 1291 unless it “ends the litigation on the merits and leaves nothing for the court to do but execute the judgment.” Quackenbush v. Allstate Ins. Co., 517 U.S. 706, 712, 116 S.Ct. 1712, 1718, 135 L.Ed.2d 1 (1996) (internal quotation marks omitted). Under the collateral order (Cohen) doctrine, however, an order qualifies as “final” under § 1291 if it: “(1) conclusively determine[s] the disputed question, (2) resolved] an important issue completely separate from the merits of the action, and (3) [is] effectively unreviewable on appeal from a final judgment.” Puerto Rico Aqueduct & Seiver Auth. v. Metealf & Eddy, Inc., 506 U.S. 139, 144, 113 S.Ct. 684, 688, 121 L.Ed.2d 605 (1993) (internal quotation marks omitted); see Cohen v. Beneficial Indus. Loan Corp., 337 U.S. 541, 546, 69 S.Ct. 1221, 1225, 93 L.Ed. 1528 (1949).

The application of the collateral order doctrine to the discovery order at issue here is controlled by ora1 recent decisions in United States v. Philip Morris Inc., 314 F.3d 612 (D.C.Cir.2003), and In re England, 375 F.3d 1169 (D.C.Cir.2004). In those cases, we concluded that orders compelling production of allegedly privileged information satisfied the three criteria for collateral review. See Philip Morris, 314 F.3d at 615-16 (attorney-client privilege); England, 375 F.3d at 1175-76 (statutory non-disclosure provision covering Navy selection board proceedings); see also Pearson v. Miller, 211 F.3d 57, 64 (3d Cir.2000) (holding that the collateral order doctrine permitted appeal from an order compelling the production of records relating to the “violent sexual proclivities” of an individual, where the individual contended the records were protected by state and federal privileges). The same analysis applies to the order in this case, which overrode the appellant’s claims of a number of privileges.

First, by compelling production notwithstanding the appellant’s claims of privilege, the order “conclusively and finally determined” that the documents were not protected from disclosure to plaintiffs’ counsel by any privilege. Philip Morris, 314 F.3d at 617. As in Philip Morris, “[i]n no way does the record suggest that the district court’s conclusion is tentative or subject to revision.” Id. The plaintiffs dispute the conclusiveness of the district court’s order on the ground that it requires disclosure only to counsel; disclosure for use at trial requires a further decision by the court. But the order is final with respect to that initial disclosure, and if the documents are privileged — a point we must accept as true for purposes of deciding this jurisdictional question — an involuntary disclosure to the plaintiffs’ counsel breaches the privilege. Although the appellant may suffer additional injury if additional disclosure is later permitted, that does not diminish the original injury or make the court’s authorization of it any less final.

Second, the issue is both completely separate from the merits and important. Just as was the case for the attorney-client privilege in Philip Morris, “the privilege question” here “is separable from the merits of the underlying case.” Id.; see England, 375 F.3d at 1175. And like the attorney-client privilege, the privileges at issue here are “ ‘important’ in Cohen’s sense,” in that they are “weightier than the societal interests advanced by the ordinary operation of final judgment principles.” Digital Equip. Corp. v. Desktop *1210 Direct, Inc., 511 U.S. 863, 879, 114 S.Ct. 1992, 2002, 128 L.Ed.2d 842 (1994). As we discuss below, the appellant’s privilege claims fall into two categories: the federal psychotherapist privilege and D.C. statutory medical-records privileges. The Supreme Court has determined that the psychotherapist privilege is important enough to rank with the attorney-client privilege as one of only a handful of privileges cognizable under Federal Rule of Evidence 501. Jaffee, 518 U.S. at 9-10, 116 S.Ct. at 1928. “Like the spousal and attorney-client privileges,” the Court said, “the psychotherapist-patient privilege is rooted in the imperative need for confidence and trust,” and “promotes sufficiently important interests to outweigh the need for probative evidence.” Id. at 9-10, 116 S.Ct. at 1928 (internal quotation marks omitted). The District of Columbia has similarly indicated the importance it attaches to the other (perhaps overlapping) privileges claimed by the appellant by specifically according them statutory protection. Cf. England, 375 F.3d at 1176 (noting that a federal statutory non-disclosure provision was an indication of the “importance” of a protected interest for purposes of the Cohen doctrine); Pearson, 211 F.3d at 64 (concluding that a claim that state statutory confidentiality provisions should be recognized as federal evidentiary privileges was important for purposes of Cohen).

Third, the order will be effectively unre-viewable on appeal from a final judgment. The district court has ordered the District of Columbia to turn over the appellant’s records to plaintiffs’ counsel. The District has indicated that, absent our intervention, it will follow that order. See Am. Notice of Defs. Regarding Production of Records at 1. At that point, “the entirety of the [records] will have been disclosed to third parties, making the issue of privilege effectively moot.” Philip Morris, 314 F.3d at 619. As our prior cases have repeatedly noted, “appeal after final judgment is obviously not adequate in [privilege] cases — the cat is out of the bag.” England, 375 F.3d at 1176 (quoting In re Papandreou, 139 F.3d 247, 251 (D.C.Cir.1998)); see Philip Morris, 314 F.3d at 619 (same).

We therefore conclude that the criteria for invocation of the collateral order doctrine are satisfied, and that we properly have jurisdiction over appellant’s appeal. We note that appellate jurisdiction is also supported here by the rationale of the Perlman doctrine, which holds that “a discovery order directed at a disinterested third party is treated as an immediately appealable final order because the third party presumably lacks a sufficient stake in the proceeding to risk contempt by refusing compliance.” Church of Scientology v. United States, 506 U.S. 9, 18 n. 11, 113 S.Ct. 447, 452 n. 11, 121 L.Ed.2d 313 (1992) (citing Perlman v. United States, 247 U.S. 7, 13, 38 S.Ct. 417, 419, 62 L.Ed. 950 (1918)). Although the document custodian in this case, the District of Columbia, is not a “disinterested third party,” we have applied Perlman when one party seeks documents in the hands of another and a nonparty claims to possess a privilege in the documents. See United States v. AT&T, 642 F.2d 1285, 1296 (D.C.Cir.1980) (holding that an appeal should be permitted because the nonparty appellant “was not the object of the document demand and could therefore not possibly refuse disclosure and undergo a contempt citation as a means to appeal”). 3 Moreover, *1211 whatever the District’s degree of interest in the disposition of the documents, it has raised no objection to producing them and, to the contrary, has unequivocally stated its intention to do so upon court order. See In re Sealed Case, 146 F.3d 881, 883 (D.C.Cir.1998) (holding that “[t]he Perl-man doctrine applies here because the [custodian] swore ... an intention to produce the documents rather than submit to a contempt citation”). 4

Ill

In this Part, we consider the appellant’s claims of privilege regarding the documents subject to the district court’s discovery order. We review a district court’s discovery rulings for abuse of discretion. Mach aria v. United States, 334 F.3d 61, 64 (D.C.Cir.2003); Food Lion, Inc. v. United Food & Commercial Workers Int’l Union, 103 F.3d 1007, 1012 (D.C.Cir.1997). Because a “district court by definition abuses its discretion when it makes an error of law,” the “abuse-of-discretion standard includes review to determine that the discretion was not guided by erroneous legal conclusions.” Koon v. United States, 518 U.S. 81, 100, 116 S.Ct. 2035, 2048, 135 L.Ed.2d 392 (1996).

In subpart A, we consider whether federal or state privilege law applies to the district court’s discovery order. 5 In sub-part B, we examine the federal psychotherapist privilege. In subpart C, we address the appropriate disposition for those documents that, although outside the scope of the federal privilege, implicate the privacy concerns reflected in District of Columbia statutory privileges.

A

Rule 501 of the Federal Rules of Evidence states:

Except as otherwise required by the Constitution of the United States or provided by Act of Congress or in rules prescribed by the Supreme Court pursu *1212 ant to statutory authority, the privilege of a witness, person, government, State, or political subdivision thereof shall be governed by the principles of the common law as they may be interpreted by the courts of the United States in the light of reason and experience. However, in civil actions and proceedings, with respect to an element of a claim or defense as to which State law supplies the rule of decision, the privilege of a witness, person, government, State, or political subdivision thereof shall be determined in accordance with State law.

Fed.R.Evid. 501. 6 It is thus clear that when a plaintiff asserts federal claims, federal privilege law governs, but when he asserts state claims, state privilege law applies. What is unclear is the proper resolution in a case like this, where the plaintiffs assert both federal and state claims, and relevant evidence may be privileged under one but not the other. See Jaffee, 518 U.S. at 17 n. 15, 116 S.Ct. at 1931 n. 15 (noting the problem but finding its resolution unnecessary to decide that case); 23 ChaRles Alan Weight & Kenneth W. Graham, Jr., Federal Praotioe and Prooedure § 5434, at 861-64 (2d ed.1980 & Supp.2004) (hereinafter Wright & Graham) (noting uncertain legislative history and suggesting various methods of resolution).

“The usual solution by the courts” in such cases “has been a preference for federal privilege law when it conflicts with state privilege law.” 3 Joseph M. McLaughlin et al., Weinstein’s Federal Evidence § 501.02[2][c], at 501-14 (2d ed.2004) (hereinafter Weinstein’s) (collecting cases). 7 There is much to be said for this approach. Where a document is relevant to both federal and state claims but the federal and state privilege rules are inconsistent, the application of an inconsistent state rule in either direction could undermine the federal evidentiary interest — either by barring disclosure of a document that federal law permits a party to see, or by requiring the disclosure of a document that federal law protects from prying eyes. At least with respect to discovery, “it would be meaningless to hold the communication privileged for one set *1213 of claims and not for the other.” Memorial Hosp., 664 F.2d at 1061 n. 3. 8 And where the primary source of the court’s jurisdiction is the federal claim, to which the state claim is merely pendent (supplemental), it seems appropriate that the federal evidentiary interest — whether in privilege or production — should be primary as well.

Unfortunately, neither the district court nor the parties have addressed this question, and we hesitate to decide it conclusively (and for the first time in this circuit) without the benefit of briefing. Fortunately, it does not appear that we have to do so to resolve this appeal. As we discuss below, the federal psychotherapist privilege requires the withholding of some documents (if they exist) as absolutely privileged, and the D.C. statutes appear to be at least as protective. See infra note 9. Whether or not additional documents are subject to privilege under state law, Federal Rule of Civil Procedure 26 at least requires the district court to weigh the appellant’s privacy interest in those documents against the plaintiffs’ need for them before it orders production. Because the court did not undertake such a weighing, a remand is required in any event. Until that weighing is complete and the court decides which (if any) documents still must be produced over the appellant’s objection, we need decide neither whether a state privilege would cover such hypothetical documents, nor (if it would) whether state privilege law is applicable to the plaintiffs’ claims.

B

In Jaffee v. Redmond, the Supreme Court held that “confidential communications between a licensed psychotherapist and her patients in the course of diagnosis or treatment are protected from compelled disclosure” — including from compelled production pursuant to pretrial discovery — under Rule 501. 518 U.S. at 15, 116 S.Ct. at 1930; see id. at 6, 116 S.Ct. at 1926. The Court also extended this federal psychotherapist privilege “to confidential communications made to licensed social workers in the course of psychotherapy.” Id. at 15, 116 S.Ct. at 1931. Thus, any “conversations between” the appellant and a licensed psychotherapist or social worker “and the notes taken during their counseling sessions are protected from compelled disclosure under Rule 501 of the Federal Rules of Evidence.” Id. at 6, 18, 116 S.Ct. at 1926, 1932. District of Columbia statutory provisions appear to provide a privilege at least as broad. 9

*1214 Although the district court did not address Jaffee directly, it did state generally that “privileges are qualified or conditional for a number of reasons, including in the interests of justice.” See 5/15/03 Tr. at 10. That statement is incorrect with respect to the psychotherapist privilege. In Jaffee, the Court flatly rejected the suggestion that the privilege was subject to balancing. 518 U.S. at 17, 116 S.Ct. at 1932. “Making the promise of confidentiality contingent upon a trial judge’s later evaluation of the relative importance of the patient’s interest in privacy and the evi-dentiary need for disclosure,” the Court said, “would eviscerate the effectiveness of the privilege.” Id. Accordingly, the district court may not permit the plaintiffs’ counsel to see materials covered by this privilege, regardless of its assessment of “the interests of justice.”

The appellant’s guardian has represented that she has reviewed the appellant’s MRDDA files, and that they do contain confidential communications to mental health workers in the course of psychotherapy. Oral Arg. Tape at 2:10-2:25. We, of course, do not know whether that is correct. But the district court and plaintiffs did not know either. Nonetheless, the court ordered disclosure of all of the appellant’s records, without regard to their content and without screening them in any way. Because that order could compel the disclosure of material subject to a federal privilege, it constitutes an abuse of the district court’s discretion.

C

The federal psychotherapist privilege recognized in Jaffee extends no further than confidential communications between licensed mental health professionals and their patients. Jaffee, 518 U.S. at 15, 116 S.Ct. at 1930; see id. at 10, 116 S.Ct. at 1928. The appellant cites no other federal privilege, but does cite several provisions of the D.C.Code that appear to extend privacy protection to appellant’s files well beyond the protection accorded by Jaffee. See supra note 9. We have been unable to find District of Columbia cases that delineate the scope of those asserted statutory privileges in any way that is relevant here. 10 But regardless of whether the statutory provisions afford privileges that would of themselves bar disclosure of documents in the appellant’s file, those provisions should at least inform a district court’s determination of whether to compel production of the documents under Federal Rule of Civil Procedure 26.

Rule 26(b)(1), under which the plaintiffs sought discovery of the appellant’s file, provides as follows:

Parties may obtain discovery regarding any matter, not privileged, that is relevant to the claim or defense of any party.... For good cause, the court may order discovery of any matter rele *1215 vant to the subject matter involved in the action. Relevant information need not be admissible at the trial if the discovery appears reasonably calculated to lead to the discovery of admissible evidence. All discovery is subject to the limitations imposed by Rule 26(b)(2)(i), (ii), and (in).

Fed.R.Civ.P. 26(b)(1) (emphasis added). The last sentence of Rule 26(b)(1) was added in 2000 “to emphasize the need for active judicial use of subdivision (b)(2) to control excessive discovery.” Fed.R.Civ.P. 26(b)(1) advisory committee’s note (2000). 11 Subdivision (b)(2) — entitled “Limitations” — in turn provides:

[The] extent of use of the discovery methods otherwise permitted under these rules ... shall be limited by the court if it determines that ... (iii) the burden or expense of the proposed discovery outweighs its likely benefit, taking into account the needs of the case, ... the importance of the issues at stake in the litigation, and the importance of the proposed discovery in resolving the issues. The court may act upon its own initiative after reasonable notice or pursuant to a motion under Rule 26(c). '

Fed.R.CivP. 26(b)(2). Finally, Rule 26(c), entitled “Protective Orders” and referred to in the last sentence of subdivision (b)(2), authorizes the court,

for good cause shown, ... [to] make any order which justice requires to protect a party or person from annoyance, embarrassment, oppression or undue burden or expense, including one or more of the following: ... (4) that certain matters not be inquired into, or that the scope of the disclosure or discovery be limited to certain matters....

Fed.R.'CivP. 26(c).

As a whole, “Rule 26 vests the trial judge with broad discretion to tailor discovery narrowly.” Crawford-El v. Britton, 523 U.S. 574, 598, 118 S.Ct. 1584, 1597, 140 L.Ed.2d 759 (1998). And “[i]t is appropriate for the court, in exercising its discretion..., to undertake some substantive balancing of interests.... ” Laxalt v. McClatchy, 809 F.2d 885, 890 (D.C.Cir.1987); see United States v. Microsoft Corp., 165 F.3d 952, 960 (D.C.Cir.1999) (holding that Rule 26(c)’s “ ‘good cause’ standard ... is a flexible one that requires an individualized balancing of the many interests that may be present in a particular case”). In particular, “[although [Rule 26(c) ] contains no specific reference to privacy or to other rights or interests that may be implicated, such matters are implicit in the broad purpose and language of the Rule.” Seattle Times Co. v. Rhinehart, 467 U.S. 20, 35 n. 21, 104 S.Ct. 2199, 2208 n. 21, 81 L.Ed.2d 17 (1984). Hence, in exercising their discretion under the rule, courts have long “recognized that interests in privacy may call for a measure of extra protection,” even where the information sought is not ■ privileged. Fed. R.Civ.P. 26(b) advisory committee’s note (1970) (referring to income tax returns, which are “generally held not privileged”); see Pearson, 211 F.3d at 72 (holding that “[[legitimate interests in privacy are among the proper subjects of’ Rule 26(c)’s protection).

Moreover, in determining which interests to weigh in the Rule 26 balance, courts look to statutory confidentiality pro *1216 visions, even if they do not create enforceable privileges. In Laxalt v. McClatchy, for example, we noted that, although the Privacy Act, 5 U.S.C. § 552a, did not create a qualified discovery privilege, the fact that a document was subject to the Act was not “irrelevant to the manner in which discovery should proceed.” 809 F.2d at 889. To the contrary, we held that “[wjhere the actual content of the record has the potential to cause harm to the affected party, a court supervising discovery should consider this factor in determining how to exercise its traditional authority to limit disclosure.” Id. at 890; see also Microsoft, 165 F.3d at 959-60.

The Seventh Circuit made a similar point in a case raising issues close to those we face here. In Northwestern Memorial Hospital v. Ashcroft, a district court had quashed a subpoena for patients’ medical records based on a state evidentiary privilege (which, the district court held, trumped a less stringent federal regulation pursuant to the operation of a specific federal statute). 362 F.3d 923, 924-27 (7th Cir.2004). Relying on Rule 501, the court of appeals held that the state evidentiary privilege did not apply in a suit to enforce federal law. Id. at 926. Nonetheless, relying on a provision of Rule 45 (governing subpoenas) similar to Rule 26(b)(2)(iii) and (e), 12 it affirmed the district court’s disposition because there was only “the possibility” that the records might have something probative in them, while their disclosure would cause “the loss of privacy by the patients,” id. at 927. Particularly relevant here, the Seventh Circuit held that “[t]he fact that quashing the subpoena comports with Illinois’ medical-records privilege” was a “factor in favor of the district court’s action.” Id. at 932. “Comity,” the court said, did not require it “to apply the Illinois privilege,” but did require it “to consider with special care the arguments for quashing the subpoena on the basis of relative hardship under Fed.R.Civ.P. 45(c).” Id. at 933.

In sum, as the Third Circuit has likewise held, even where an evidentiary “privilege is not available, a party may petition the court for a protective order that limits discovery in accordance with Rule 26(c).” Pearson, 211 F.3d at 65. And the “court, in its discretion, is authorized by this subsection to fashion a set of limitations that allows as much relevant material to be discovered as possible, while preventing unnecessary intrusions into the legitimate interests — including privacy and other confidentiality interests ■— that might be harmed by the release of the material sought.” Id.; see id. at 61 (holding that, although a state mental-health-records privilege was inapplicable, the appellants had “legitimate concerns regarding the confidentiality of the information sought” that should be “addressed in the context of the District Court’s power to impose reasonable limits on the discovery of information pursuant to Federal Rule of Civil Procedure 26(c)”).

In this case, the district court undertook no balancing of competing interests at all. As its August 2003 Order makes clear, it required production of the appellant’s entire MRDDA file — regardless of whether the material was privileged, regardless of whether it was relevant to a claim or defense, regardless even of whether it was relevant to the subject matter of the case. August 2003 Order at 1-2. At the request of plaintiffs’ counsel, the preceding (February 2003) order’s requirement of relevancy was jettisoned, and plaintiffs’ counsel was effectively deputized *1217 by the court to review the records and determine which were relevant. See 5/15/03 Tr. at 15-16 (directing that plaintiffs’ counsel be allowed “to review the entire file and to tab those records that he believes will serve his evidentiary purposes”).

The scope of this intrusion into the appellant’s privacy is breathtaking. The court directed that plaintiffs’ counsel “be permitted to review all records referred to in District of Columbia Code section 7-1305.12.” 5/15/03 Tr. at 16. As the appellant’s guardian correctly complained, and as the portion of the statute set out in the margin makes manifest, that section covers records involving “every area of the severely mentally-retarded’s lives.” Id. at 6. 13 There may well be documents within that universe that are highly relevant to the plaintiffs’ case because they “afford evidence of notice to the District of Columbia that, as alleged in the complaint, [the appellant was] a sexual predator” who was a threat to the plaintiffs. 5/15/03 Tr. at 4 (explanation by plaintiffs’ counsel of the relevance of the requested documents). And the probative value of such documents may well outweigh the appellant’s privacy interests. But it would be surprising if there were not also documents that — although hugely invasive of the appellant’s privacy — are of only marginal relevance. And it would also be surprising if there were not others that —■ while equally intrusive — have nothing at all to do with the plaintiffs’ claims. By treating all of the MRDDA documents alike, and thereby failing to weigh the appellant’s privacy interest in a record against the record’s value to the plaintiffs, the district court abused the discretion conferred upon it by Rule 26. See In re Sealed Case, 856 F.2d 268, 272 (D.C.Cir.1988) (holding that “[although a district court has considerable leeway in weighing the different factors, the failure to balance at all requires remand”) (internal citation omitted); LaSalle Extension Univ. v. FTC, 627 F.2d 481, 484 *1218 (D.C.Cir.1980) (holding that “the district court abuses [its] discretion when it fails to weigh” the relevant factors).

IV

We conclude that the district court abused its discretion by requiring the District of Columbia to produce all of the appellant’s “mental retardation records” to counsel for the plaintiffs, August 2003 Order at 1, without protecting any records that may be subject to the federal psychotherapist privilege, and without weighing the appellant’s privacy interests against the plaintiffs’ evidentiary need for the remaining records. We therefore vacate the court’s order and remand the case for further proceedings.

On remand, the district court has a number of options. It may, for example, permit the appellant’s guardian to conduct an initial screening and produce any documents she concludes are not privileged or confidential. As to any withheld documents, the court may require the guardian to produce the “privilege log” described in Rule 26(b)(5). 14 If the log is insufficient to enable the court to resolve the issue, it may review the withheld documents in camera, 15 And if the volume of withheld documents is too large for the court’s own review, the court may delegate the task to a magistrate judge. 16 But whether the district court employs this procedure or one of its own devise, it may not compel production of the appellant’s records without determining whether any are subject to a federal privilege, and without weighing the probative value of each of the non-privileged documents against the extent of the intrusion into the appellant’s legitimate privacy interests.

Vacated and remanded.