Correct Use of the AMA Guides Determines Outcome in Brus v. Tyson Fresh Meats
March 12, 2026
By: Thania Rios
On 2/10/2026, the Iowa Workers’ Compensation Commission issued a decision in
Areli Brus v. Tyson Fresh Meats. Deputy Jennifer S. Gerrish-Lampe ruled in favor of the defendant, who was represented by
Charles Showalter of Corridorlaw Group Iowa, P.C. In her decision, Deputy Gerrish-Lampe found that the strength of Claimant’s case was undermined by her independent medical exam, which incorrectly applied Table 6-9 of the
AMA Guides, 5th Edition while assigning Claimant an impairment rating.
Ms. Brus, a Tyson employee, alleged that injuries sustained during a slip-and-fall at work resulted in an abdominal hernia. She underwent surgery with a mesh implant to repair the hernia, but still complained of pain afterwards and ultimately brought an action against Tyson. As part of her case, she underwent an IME with Dr. Sunil Bansal. Dr. Bansal assigned Ms. Brus a whole-body impairment rating of 9% based on the fact that she was still experiencing pain at her surgery site that “went beyond ‘occasional mild’.” Areli Brus v. Tyson Fresh Meats, File No. 22000220.02
(Arb. 2/10/2026) at 7.
Dr. Bansal’s assessment contradicted the conclusion reached by Defendant’s expert, Dr. Douglas Martin. Dr. Martin, a co-chair of the AMA Guides
Editorial Panel, stated in his report that an impairment rating can only be assigned for a hernia if there is a “palpable defect in the supporting structures of the abdominal wall.” Id. at 8. Given that Ms. Brus underwent a successful mesh implant surgery, she suffered from no such defect in her abdominal wall—and, therefore, had no impairment attributable to her hernia.
The outcome in this case is another reminder of the importance of ensuring that IME providers utilize the Guides
carefully and correctly. By her own admission, Deputy Gerrish-Lampe found portions of Dr. Bansal’s report persuasive. Id. Iowa law, however, requires deputies to assign impairment ratings in accordance with the Guides—and Dr. Martin was the only provider who did that correctly.
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Recent cases highlight how the Agency weighs key factors in determining awards. By: Thania Rios
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What Workers’ Compensation Is Designed to Do Workers’ compensation is a system created to provide benefits to employees who are injured while performing their job duties. In Iowa, this system is intended to offer medical care and wage replacement without requiring injured workers to prove fault. At the same time, workers’ compensation limits an employer’s exposure to lawsuits by providing an exclusive remedy in most workplace injury situations. This balance is a key feature of the system. Who Is Covered Under Iowa Workers’ Compensation Law Most employees in Iowa are covered by workers’ compensation, regardless of whether the injury occurred suddenly or developed over time. Coverage generally applies when an injury arises out of and in the course of employment. There are limited exceptions depending on the nature of the work and employment relationship. Understanding whether an injury qualifies often depends on specific facts and circumstances. Types of Benefits Available Workers’ compensation benefits in Iowa may include medical treatment related to the injury and partial wage replacement if the injury prevents an employee from working. In some cases, benefits may also address permanent impairment or long-term disability. The type and duration of benefits depend on the nature of the injury and how it affects an employee’s ability to work. Why Understanding the System Matters Many injured workers are unfamiliar with workers’ compensation until an injury occurs. Misunderstanding how the system works can lead to missed deadlines or confusion about available benefits. Learning the basics helps injured workers better navigate the process and set realistic expectations. Final Thoughts Workers’ compensation in Iowa is designed to provide support after a workplace injury, but the process can be complex. Understanding how the system works is an important first step for anyone dealing with a work-related injury. This content is for general informational purposes and does not constitute legal advice.
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Without strong objective evidence, it is very possible for claims to fail.
When testimony conflicts with the evidence, credibility becomes the deciding factor.
On August 27, 2025, the Iowa Workers’ Compensation Commission issued a decision in Irvin v. Tyson Fresh Meats. Deputy Amanda R. Rutherford ruled in favor of the defendant, who was represented by Jason Wiltfang of Corridorlaw Group Iowa, P.C. In her decision, Deputy Rutherford found that the evidence in the record was insufficient to establish that the claimant’s duties resulted in a cumulative injury. While explaining the rationale behind her decision, the Deputy paid particular attention to the vague job description that Irvin provided to her medical expert. In the letter sent to her expert requesting an opinion and providing background information, Irvin included an excerpt from her Answers to Defendant’s Interrogatories that stated that, at work, “she made 500 to 1,000 boxes daily, as well as stacked boxes, moved boxes, and put them on the line, down chutes or on top units” and that “the job required repetitive lifting, bending, and twisting.” Irvin , File No. 23009752.01 (Arb. 1/31/2025) at 15. However, Irvin did not “provide pertinent details such as weighs, sizes, amount of force needed, and/or explain body mechanics that could have caused her alleged injuries.” Id . Deputy Rutherford stated that, because of this omission, the claimant’s expert was “not given an accurate, detailed and/or complete job description before authorizing his report.” Id . The fact that the claimant’s expert based his examination on an incomplete job description ultimately proved fatal to Irvin’s case. As the Deputy noted in her decision, “[i]n a cumulative injury claim, a medically supported diagnosis, detailed and complete job description, and clearly articulated mechanism of injury are essential evidence.” Id. Without that evidence, it is very difficult for claimants to meet their burdens of proof. The decision in Irvin goes to show that, when it comes to cumulative injury cases, experts should be provided with complete job descriptions—otherwise, the flawed foundation of the expert’s opinion can render it unpersuasive.
