When is expert testimony required to prove medical causation in Utah negligence cases? Hansen v. Harper Excavating Explained

The Utah Court of Appeals’ decision in Hansen v. Harper Excavating provides important guidance on when expert testimony is required to establish causation in negligence cases involving medical injuries and how treating physicians must be properly disclosed as expert witnesses.

Background and Facts

Jeffrey Hansen sued his former employer after health insurance enrollment problems prevented him from obtaining timely medical care. Hansen claimed the delays in coverage caused permanent back injuries from an untreated staph infection, blindness in one eye from inability to afford glaucoma surgery, and chronic depression. The district court granted summary judgment for defendants, finding Hansen failed to provide required expert testimony on causation.

Key Legal Issues

The court addressed two critical issues: (1) whether expert testimony was necessary to prove causation between the insurance delays and Hansen’s medical injuries, and (2) whether treating physicians disclosed as fact witnesses could provide expert testimony on causation without proper Rule 26(a)(3)(A) disclosure.

Court’s Analysis and Holding

The court held that expert testimony was required because the connection between defendants’ conduct and Hansen’s injuries involved “obscure medical factors which are beyond an ordinary lay person’s knowledge.” The court found it was not within ordinary knowledge whether: earlier diagnosis would have prevented Hansen’s back damage, the recommended glaucoma surgery would have preserved his sight, or the insurance problems caused his depression among other potential factors. Additionally, the court emphasized that treating physicians must be specifically disclosed as expert witnesses under Rule 26(a)(3)(A) to provide opinion testimony, not merely identified as fact witnesses.

Practice Implications

This decision underscores that complex medical causation generally requires expert testimony except in “the most obvious cases.” Practitioners must carefully evaluate whether causation involves medical complexities beyond lay understanding and ensure proper expert witness disclosure. When relying on treating physicians for causation testimony, they must be disclosed as expert witnesses capable of providing opinions based on specialized knowledge, not just factual observations about treatment.