Date: Jul 31, 2026

Service of Notice of Appeal Is Nonjurisdictional; Late Expert Declarations Cannot Be Wholly Excluded When Substantially Justified/Harmless and Supporting Properly Disclosed Malpractice Opinions

Introduction

Thaete v. St. Luke's Magic Valley Medical Center (Idaho Supreme Court, July 29, 2026) is a medical-malpractice appeal arising from the death of Sherry Thaete after she was administered Paxil (paroxetine) despite reportedly taking Nardil (phenelzine), a contraindicated combination. Her husband and sons (the “Thaetes”) sued St. Luke’s Magic Valley Medical Center and the attending physician, Michael R. Fry, D.O., under Idaho’s Medical Malpractice Act.

The district court entered summary judgment for both defendants after striking portions of the Thaetes’ summary-judgment opposition (including an expert declaration) and after finding their remaining expert proof inadmissible or insufficient under Idaho Code sections 6-1012 and 6-1013. On appeal, the Supreme Court addressed: (1) whether failure to serve a notice of appeal is jurisdictional; (2) the propriety of striking late-filed summary-judgment materials; (3) foundational adequacy for an out-of-area, board-certified internal medicine expert; and (4) whether a nursing expert disclosure included a breach opinion.

Summary of the Opinion

Appellate jurisdiction: Failure to serve a notice of appeal is not jurisdictional under I.A.R. 21; dismissal is discretionary and unwarranted here because Respondents fully participated and showed no prejudice.
Motion to strike: The district court properly struck the Thaetes’ August 29 supplemental response as untimely, but abused its discretion by striking Dr. McIlraith’s August 28 declaration in its entirety.
Expert foundation (I.C. §§ 6-1012, 6-1013): Dr. McIlraith had an adequate foundation to opine on the applicable standard of care for Dr. Fry.
Nursing breach disclosure: The district court correctly held Nurse Chisum’s disclosure did not include an opinion that St. Luke’s nursing staff breached the standard of care.
Disposition: Summary judgment is reversed as to Dr. Fry but affirmed as to St. Luke’s (as framed through the excluded/insufficient nursing breach proof). The amended judgment is vacated and the case is remanded.

Analysis

Precedents Cited

1) Appellate procedure: service defects vs. jurisdiction

The Court anchored its jurisdictional analysis in the text of I.A.R. 21, distinguishing jurisdictional defects (untimely filing) from nonjurisdictional defects (other steps, including service). It treated Respondents’ reliance on older authorities as largely superseded by the 1977 rules and, in any event, factually distinguishable.

Moe v. Harger and Harris v. Bechtel Corp.: characterized as pre-rules, statutory-era decisions not controlling under the current Idaho Appellate Rules.
Helgeson v. Powell, Finlayson v. Humphreys, Mortimer v. Riviera Apartments, and Campbell v. Bonneville County Board of Commissioners: read together (as explained in Campbell) as focusing on whether an unserved party is adversely affected or deprived of notice/opportunity to defend. Here, Respondents participated fully, so dismissal was not a fitting sanction.
Hollis v. State (quoting Bunn v. Bunn): supplied the policy frame favoring decisions on the merits and discretion that promotes substantive resolution.

Practical doctrinal upshot: The opinion reinforces a rule-like approach: filing deadlines are jurisdictional; service failures are sanctionable but not jurisdiction-destroying, with prejudice and participation driving the remedy.

2) Motions to strike, scheduling orders, and expert supplementation

On striking late filings, the Court treated the issue as discretionary and reviewed it under the Lunneborg v. My Fun Life framework, citing Fisk v. McDonald on evidentiary rulings. It also deployed a line of discovery fairness cases that caution against rewarding “stonewalling.”

Easterling v. Kendall, Rich v. Hepworth Holzer, LLP: confirm trial courts’ sanction authority for noncompliance with scheduling orders.
Edmunds v. Kraner: central to the majority’s analysis. The Court used Edmunds to justify differential treatment of late expert materials—excluding late, new opinions where the proponent failed to use procedural tools, but allowing supplemental material expanding timely-disclosed opinions, particularly where the opposing party’s conduct contributed to timing pressure.
Phillips v. E. Idaho Health Servs., Inc.: reiterated the Court’s disfavor of discovery regimes or rulings that “unreasonably prevent plaintiffs from responding,” especially in complex malpractice cases dependent on expert proof.
Gordon v. U.S. Bank National Ass'n and Lepper v. Eastern Idaho Health Services, Inc.: used to underscore that procedural rules should ensure a fair chance to respond, and that harsh exclusionary sanctions may be improper where confusion or minor, nonprejudicial missteps exist—particularly when the opposing party’s behavior has complicated discovery and disclosure timing.

The Court drew a key distinction: it upheld striking the late argument brief (supplemental response) while reversing wholesale exclusion of the late expert declaration because it (i) largely restated timely disclosed opinions, (ii) supplemented based on later-produced materials, and (iii) responded to Respondents’ later expert disclosure—making the delay “substantially justified” and “harmless” in context.

3) Malpractice expert admissibility and “actual knowledge” of community standard

The Court’s foundation analysis fits into the modern arc of Idaho malpractice jurisprudence: strict statutory requirements, but with a “common sense” lens and no “magic language” requirement, especially where board certification and reliable sources show the expert verified local equivalence.

Summerfield v. St. Luke's McCall, Ltd., Fisk v. McDonald, Mattox v. Life Care Ctrs. of Am., Inc.: collectively emphasize that admissibility turns on whether the affidavit/deposition alleges facts showing actual knowledge of the community standard, evaluated with common sense and without liberal construction at the admissibility step.
Dlouhy v. Kootenai Hosp. Dist. and Phillips v. E. Idaho Health Servs., Inc.: supplied the specialized rule for board-certified specialists: (1) same specialty board certification supports use of a national standard, but (2) the expert must still “inquire” into the community standard to ensure no local deviation.
Navo v. Bingham Mem'l Hosp.: invoked for the caution that internal policies/national standards cannot simply “replace” local standards where they do not govern actual care—but they can be relevant as corroborative sources when tied to practice evidence.
Samples v. Hanson, Grover v. Smith, Frank v. E. Shoshone Hosp.: used to support that straightforward, rudimentary standards reduce the need for hyper-technical foundation showings (while not eliminating the statutory requirement).
Kozlowski v. Rush: cited as an example of an expert using a national standard plus local-source confirmation to establish foundation.

Legal Reasoning

1) Service of notice of appeal: text-first interpretation of the appellate rules

The Court treated the Idaho Appellate Rules as dispositive. Under I.A.R. 21, only failure to “physically file” the notice within the deadline is jurisdictional. Under I.A.R. 20, service is mandatory but not labeled jurisdictional. The Court then applied a prejudice/participation lens drawn from earlier service cases (as synthesized in Campbell v. Bonneville County Board of Commissioners): where the respondent fully participates and is not deprived of notice/opportunity, dismissal is an excessive sanction.

2) Striking late expert materials: proportionality and parsing rather than categorical exclusion

Although the August 22 deadline controlled, the Court held it was error to strike the declaration wholesale because:

Rule 37(c)(1) lens: the Court faulted the district court for not meaningfully accounting for whether the six-day delay was “substantially justified or is harmless,” particularly given the discovery history and Respondents’ late production/expert disclosure timing.
Function over labels: calling the filing “rebuttal” did not convert previously disclosed case-in-chief opinions into improper rebuttal; courts should parse what is (a) restatement, (b) supplementation, and (c) true rebuttal.
Anti-stonewalling principle: echoing Edmunds v. Kraner and Phillips v. E. Idaho Health Servs., Inc., the Court viewed categorical exclusion as incentivizing delayed production and tactical withholding, especially where malpractice cases are expert-driven.

The Court nevertheless affirmed striking the late supplemental brief because it was additional argument after a timely opposition already existed and did not fit the same supplementation logic as expert proof.

3) Expert foundation: board certification + local confirmation sources + simplicity of standard

The Court held Dr. McIlraith satisfied Idaho Code sections 6-1012 and 6-1013 because:

Same specialty board certification: Dr. Fry (D.O.) and Dr. McIlraith (M.D.) were both internal medicine board-certified, and Dr. Fry testified the standard for M.D./D.O. hospitalists was “Exactly the same.”
Inquiry into local practice: Dr. McIlraith reviewed Dr. Fry’s deposition describing the medication reconciliation workflow and reviewed St. Luke’s medication ordering policy; together these were treated as reliable indicators that the community standard did not deviate from national standards.
Straightforward standards: documenting home medications and avoiding a contraindicated pairing (Paxil with Nardil) were characterized as rudimentary, supporting common-sense inference that the standards would not be idiosyncratic to locality.

Importantly, the Court did not say internal policies alone establish the standard; it treated them as corroborative when aligned with practice testimony and specialty norms.

4) Nursing expert disclosure: “standard of care” is not “breach”

The Court drew a bright line between identifying the applicable standard and opining that the defendant breached it. Nurse Chisum’s disclosure stated what nurses should do (enter provided home-medication information into the chart) but did not apply that standard to any nurse’s conduct or express a breach opinion. The Court therefore affirmed exclusion as to St. Luke’s nursing breach proof.

Impact

1) Idaho appellate practice

Reduced “gotcha” dismissals: litigants can expect that failure to serve a notice of appeal will ordinarily be addressed through sanctions, not automatic dismissal, especially where the respondent appears and briefs the merits.
Prejudice matters: parties seeking dismissal for service defects must confront participation and prejudice facts rather than rely on older jurisdictional rhetoric.

2) Trial-court case management and sanctions

Parsing expert materials: trial courts are pushed away from categorical exclusion of entire expert submissions where portions restate timely opinions or constitute proper supplementation/rebuttal.
Discovery conduct becomes relevant: the Court signaled that obstruction/late production can make an opponent’s “late” supplementation substantially justified and that sanction decisions should not reward stonewalling.

3) Medical malpractice expert foundation

Board-certified specialist pathway reaffirmed and operationalized: confirming local equivalence may be accomplished through defendant physician deposition testimony plus corroborative institutional materials, not necessarily through consultation with a local practitioner.
“Simple standard” as a reinforcing factor: courts may consider the complexity of the alleged standard as part of the common-sense evaluation of whether the expert likely achieved “actual knowledge.”

4) Practical consequence for hospitals and plaintiffs

Plaintiffs: must draft nursing and institutional expert disclosures to clearly state both (i) the standard and (ii) breach; “agreeing with a standard” is not enough.
Hospitals/defendants: cannot assume internal policies are irrelevant; when tied to deposition testimony about actual workflow, they can strengthen (or undermine) standard-of-care foundation arguments.

Complex Concepts Simplified

Jurisdictional defect: A mistake that deprives the appellate court of legal power to hear the case. Here, late filing of a notice of appeal is jurisdictional; defective service is not.
Summary judgment: A pretrial ruling entered when there is no genuine dispute of material fact and the movant is entitled to judgment as a matter of law (I.R.C.P. 56(a)), reviewed de novo.
Medical malpractice “community standard of care” (I.C. § 6-1012): The level of care expected of similarly trained providers of the same class in the same community at the relevant time—proved by direct expert testimony in the plaintiff’s case-in-chief.
Foundation for expert testimony (I.C. § 6-1013): The threshold showing that the expert truly holds the opinion, can state it with reasonable medical certainty, and has professional expertise plus actual knowledge of the applicable community standard.
Rebuttal vs. supplementation: Rebuttal responds to new matters raised by the opponent; supplementation updates earlier disclosures with modified/expanded information as discovery develops (I.R.C.P. 26(e)(2)). A “rebuttal” label does not automatically bar use of a declaration that includes properly disclosed or properly supplemented opinions.
“Breach” vs. “standard”: “Standard” describes what should have been done; “breach” states the defendant did not do it. Expert disclosures must address both when breach is at issue.

Conclusion

Thaete delivers two especially consequential clarifications. First, under the Idaho Appellate Rules, failure to serve a notice of appeal is not jurisdictional, and dismissal is an exceptional sanction where the respondent had notice and fully participated. Second, in malpractice cases at the summary-judgment stage, courts should not categorically exclude late-filed expert declarations that largely restate timely disclosed opinions or constitute justified, harmless supplementation—particularly where the opponent’s discovery posture contributed to timing constraints. At the same time, the decision underscores that expert disclosures must clearly articulate breach, not merely the standard, to survive scrutiny—an omission that proved fatal to the nursing-based theory against St. Luke’s in this appeal.

Note on the dissent: Justice Zahn’s dissent would have affirmed striking the declaration as a Rule 16(e) sanction and would have applied a more demanding view of what constitutes “clearly articulated” local-standard confirmation, illustrating that future cases may litigate the boundary between strict scheduling enforcement and Rule 37(c)(1) harmlessness/substantial-justification analysis.