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UUL Lawyers
·14 November 2026·🇨🇦

Can Ontario Employers Get WSIB Cost Relief for Prior Conditions? - UL Lawyers

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Summary

An Ontario court ruling clarifies when employers can receive cost relief for workers' compensation claims involving pre-existing conditions, requiring significant medical evidence that prior conditions prolonged or enhanced workplace injuries. The case involved a psychiatric hospital nurse's PTSD claim, where the employer's request for relief was denied because earlier concussion and psychological conditions were not proven to have meaningfully contributed to the PTSD disability.

Key Points

## Can an employer reduce WSIB claim costs because of a worker’s pre-existing condition? Sometimes, but only when the evidence shows the earlier condition played a significant role in the workplace injury or in the worker’s recovery. The WSIB’s Second Injury and Enhancement Fund (SIEF) policy allows an employer’s claim costs to be reduced in limited situations. As explained in [Decision No. 796/26…

This article was originally published by UL Lawyers.

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