Which of the following qualifies as a preexisting condition for a worker?

The definition of a preexisting condition in the context of workers' compensation typically refers to any existing health issue that an employee had prior to their current work-related injury or illness. A worker having received prior medical treatment for a condition indicates that the condition existed before their employment or the current claim. This prior treatment demonstrates that there was already a health issue that could potentially influence the evaluation of subsequent claims related to the worker's ability to perform their job or the impact of a new injury on that condition.

Having a diagnosis or newly developed illness does not constitute a preexisting condition since it is not an existing ailment known before the current incident. Similarly, never having received treatment for a condition does not indicate a prior or existing issue; it might instead signify that the worker was not aware of or did not seek help for a condition. A recent worsening of a condition could potentially reflect a change in the circumstances surrounding the worker's health, but it does not definitively categorize as a preexisting condition without evidence of prior treatment or diagnosis. Thus, prior medical treatment is the key factor that qualifies as a preexisting condition in this scenario.