Ellie T. Shimp, Zach Shimp and Kerri Shimp v. Timothy A. Gibbons, M.D., Chad H. Boyer, P.A.-C., Jared A. Knowles, P.A.-C., Mason City Clinic, PC, Mercy Health Services-Iowa Corp. d/b/a MercyOne North Iowa Medical Center and Mercy Medical Center-North Iowa

Court of Appeals of Iowa·Decided November 13, 2025·No. 23-2025·Published

Opinion

IN THE COURT OF APPEALS OF IOWA

No. 23-2025

Filed November 13, 2025

ELLIE T. SHIMP, ZACH SHIMP, and KERRI SHIMP, Plaintiffs-Appellants,

vs.

TIMOTHY A. GIBBONS, MD., CHAD H. BOYER, P.A.-C., JARED A. KNOWLES, P.A.-C., MASON CITY CLINIC, PC, MERCY HEALTH SERVICES-IOWA, CORP. d/b/a MERCYONE NORTH IOWA MEDICAL CENTER, and MERCY MEDICAL CENTER-NORTH IOWA, Defendants-Appellees.

Appeal from the Iowa District Court for Cerro Gordo County, Gregg R.

Rosenbladt, Judge.

Plaintiffs, an injured jet skier and her parents, challenge a pretrial ruling confirming that under Iowa Code chapter 668 (2020) any fault of the defendant medical providers would be compared with the fault of the original tortfeasor, who settled with the plaintiffs. REVERSED AND REMANDED.

Ryan G. Koopmans (argued) of Koopmans Law Group, LLC, Des Moines, and H. Daniel Holm Jr. and Eashaan Vajpeyi of Ball, Kirk & Holm, P.C., Waterloo, for appellants.

Paul J. Esker (argued) and Desirée Kilburg of Bradley & Riley PC, Iowa City, for appellees Mercy Health Services-Iowa, Corp. d/b/a MercyOne North Iowa Medical Center and Mercy Medical Center-North Iowa.

John A. Maschman (argued) and Frederick T. Harris of Lamson Dugan & Murray LLP, West Des Moines, for appellees Timothy A. Gibbons, MD., Chad H. Boyer, P.A.-C., Jared A. Knowles, P.A.-C., and Mason City Clinic, PC.

Heard at oral argument by Tabor, C.J., and Greer, Ahlers, Badding, and Buller, JJ.

TABOR, Chief Judge.

“Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.”1 Here, Clear Lake has taught us to navigate the shoals of comparative fault principles.

On the lake, in the summer of 2018, Ellie Shimp suffered serious injuries to her leg in jet ski accident. Ellie and her parents sued and settled with the jet ski operator and owners. Now the Shimps are suing Ellie’s medical providers, alleging malpractice in the treatment of her injury. In a pretrial motion, the medical providers sought to “confirm the applicability of the Comparative Fault Act to the released persons.” The district court granted the motion, finding that any fault of the medical providers could be compared with the fault of the released parties under Iowa Code chapter 668 (2020). In this interlocutory appeal, the Shimps ask us to reverse that ruling. Because it would be error to instruct the jury to compare the fault of the released parties with any fault of the medical providers on the question of their breach of duty to their patient, we reverse and remand.

I. Facts and Prior Proceedings After a collision of two jet skis on Clear Lake crushed her leg, Ellie arrived at Mercy Medical Center-North Iowa in Mason City, where she received treatment for a left tibial plateau fracture. The next day, her medical providers diagnosed her with a popliteal artery injury and occlusion. They transferred her by helicopter to

1 From The Use of Life (1894) by Sir John Lubbock, First Baron Avebury.

the Mayo Clinic. According to a review of Ellie’s medical records by Dr. Matt Weresh, an orthopedic expert for Mercy, “Once received by the Mayo Clinic, she was taken to surgery immediately, and a vascular bypass was performed to the area of damaged arteries in her leg. Ellie reportedly has some muscle loss and weakness of dorsiflexion, as after effects from her injury. She did not have an amputation.”

Ellie and her parents first sued the jet skis owners and operator (jet ski defendants) for negligence. The Shimps settled with the jet ski defendants. The Shimps then filed a lawsuit for medical malpractice against Dr. Timothy Gibbons, physician assistants Chad Boyer and Jared Knowles, Mercy Medical Center, and the Mason City Clinic, PC (medical providers). The Shimps allege that Ellie’s medical providers failed to timely diagnose and treat the popliteal artery injury, resulting in severe injury, disfigurement, and disability of her left leg. The medical providers asserted comparative fault as an affirmative defense in their answers. They moved to confirm that chapter 668 applies to compare their fault with the jet ski defendants. See Iowa Code § 668(7). After hearing arguments, the district court confirmed the applicability of the comparative fault chapter.

The Shimps sought interlocutory appeal. Our supreme court granted review and transferred the case to us.

II. Scope and Standard of Review Whether Iowa Code chapter 668 applies to these proceedings is a matter of statutory interpretation, so we review for the correction of errors at law. Mulhern v. Cath. Health Initiatives, 799 N.W.2d 104, 113 (Iowa 2011).

III. Analysis This interlocutory medical-malpractice appeal raises a single question:

should a jury be instructed to compare the fault of the medical providers who allegedly misdiagnosed Ellie’s arterial injury with the fault of the jet ski operator and owners who settled with the Shimps in their original negligence suit?

To answer this question, we start with the comparative fault principles codified in Iowa Code chapter 668. The chapter describes how to determine liability: “In the trial of a claim involving the fault of more than one party to the claim, . . . the court . . . shall instruct the jury to answer special interrogatories” in which the jury must indicate “[t]he percentage of total fault allocated to each claimant, defendant, third-party defendant, person who has been released from liability under section 668.7,” and the injured party.2 Iowa Code § 668.3(2).

From that provision, we focus on two key terms: fault and claim. One is defined, but the other is not. The chapter defines “fault” broadly as “acts or omissions that are in any measure negligent or reckless . . . or that subject a person to strict liability.” Id. § 668.1(1). But “claim” is undefined.

To avoid comparing fault, the Shimps assert that their claim against the medical providers is not the same claim as the claim they settled against the jet ski defendants. They argue the word claim cannot mean “any wrong ever done to the same party, lest the word lose all meaning.” To support that argument, the Shimps cite DeMoss v. Hamilton, where our supreme court found that a patient’s fault for

2 The Shimps and the medical providers agree that the jet ski defendants are released parties under Iowa Code section 668.2(3).

his poor health cannot be compared with the medical negligence alleged in the patient’s cause of action.3 644 N.W.2d 302, 307 (Iowa 2002). DeMoss embraced Fritts v. McKinne, which stated that a physician “may not avoid liability for negligent treatment by asserting that the patient’s injuries were originally caused by the patient’s own negligence.” 934 P.2d 371, 374 (Okla. Civ. App. 1996)). The core concept is that “even a patient who suffers a self-inflicted injury is entitled to non- negligent medical treatment.”4 DeMoss, 644 N.W.2d at 305. The Shimps believe that DeMoss also prohibits the medical providers from avoiding liability for negligent treatment by asserting that the patient’s injuries were caused by a third party’s negligence.

The medical defendants disagree that DeMoss applies.5 They contend “the law does not afford the same protection to someone other than the patient when that other person caused or contributed to the injury necessitating the medical treatment.” They rely on Jahn v. Hyundai Motor Co., where our supreme court held that the fault of a negligent driver could be compared by the jury when evaluating Jahn’s products liability claim against Hyundai. 773 N.W.2d 550, 552

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Ellie T. Shimp, Zach Shimp and Kerri Shimp v. Timothy A. Gibbons, M.D., Chad H. Boyer, P.A.-C., Jared A. Knowles, P.A.-C., Mason City Clinic, PC, Mercy Health Services-Iowa Corp. d/b/a MercyOne North Iowa Medical Center and Mercy Medical Center-North Iowa, (iowactapp 2025).

Ellie T. Shimp, Zach Shimp and Kerri Shimp v. Timothy A. Gibbons, M.D., Chad H. Boyer, P.A.-C., Jared A. Knowles, P.A.-C., Mason City Clinic, PC, Mercy Health Services-Iowa Corp. d/b/a MercyOne North Iowa Medical Center and Mercy Medical Center-North Iowa (Ellie T. Shimp, Zach Shimp and Kerri Shimp v. Timothy A. Gibbons, M.D., Chad H. Boyer, P.A.-C., Jared A. Knowles, P.A.-C., Mason City Clinic, PC, Mercy Health Services-Iowa Corp. d/b/a MercyOne North Iowa Medical Center and Mercy Medical Center-North Iowa) — published by Counsel Stack Legal Research, free access to 12M+ legal documents.

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