Third-Party Claims After a Workplace Injury in Arizona

Workers' compensation is generally the exclusive remedy against an employer, which means an injured worker usually cannot sue the company they work for. But workplace injuries do not always involve only the employer. When someone else's negligence contributed to the injury, a separate third-party claim may exist alongside the workers' comp case.

Construction sites offer the clearest examples. A worker employed by one subcontractor might be injured by the negligence of another subcontractor's crew, a general contractor, or the property owner. The injured worker collects workers' comp through their own employer's insurance and may separately pursue a claim against the other party whose carelessness caused the harm.

Defective equipment is another common source of third-party claims. If a power tool, scaffold, ladder, or piece of industrial machinery malfunctions because of a design or manufacturing defect, the manufacturer or distributor can face a product liability claim. Similarly, a delivery driver hit by a negligent motorist while on a work route has a claim against that driver in addition to workers' comp.

Third-party claims matter because workers' comp benefits are limited by design. They replace only a portion of lost wages and do not include anything for pain and suffering. A third-party claim, by contrast, can seek the full range of civil damages, including complete wage loss, medical expenses, and compensation for pain, suffering, and reduced quality of life.

The two claims interact in ways that require coordination. Arizona law generally gives the workers' comp insurer a lien against any third-party recovery, meaning the insurer can be reimbursed for benefits it paid out of the settlement or verdict. How that lien is calculated and negotiated has a direct impact on what the injured worker ultimately keeps.

Timing and evidence collection also differ between the two tracks. Workers' comp has its own deadlines and administrative procedures, while a third-party lawsuit follows the civil court system with its own statute of limitations. Evidence like the defective product itself, the accident scene, or the at-fault driver's information needs to be preserved early, because it serves both claims. Understanding that these are parallel paths, not alternatives, is the key insight.

Related reading: What Happens After a Workplace Injury: A General Overview

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This article is general information, not legal advice. It does not create an attorney-client relationship.