Executive Summary: Key Legal and Evidentiary Issues

• Central issue was whether a new CPP disability claim was barred by res judicata following prior denials.

• Applicant relied on a post-period medical diagnosis (CRPS) to support reopening of claims.

• Tribunal had previously adjudicated the applicant’s eligibility based on the same qualifying period.

• Court assessed whether the Appeal Division reasonably refused leave to appeal under the Department of Employment and Social Development Act.

• New medical evidence was ruled not materially different from facts already considered in prior proceedings.

• The Federal Court found no reviewable error in the Tribunal’s application of res judicata and dismissed the application.

Facts and outcome of the case

Samantha Clark, a former Continuing Care Assistant, sustained a work-related injury in 2014 and later underwent surgery. She was diagnosed with Chronic Regional Pain Syndrome (CRPS) in 2021. Between 2017 and 2022, she filed three applications for disability benefits under the Canada Pension Plan (CPP), all of which were denied on the basis that her disability was not "severe and prolonged" before her minimum qualifying period ended on December 31, 2016.

Her third and final application again cited the same qualifying period. The Social Security Tribunal (General Division) denied the claim, ruling that the issue had already been finally decided and was thus barred by the principle of res judicata. Ms. Clark then sought leave to appeal from the Tribunal’s Appeal Division, arguing that her new diagnosis constituted a material change in her medical condition that warranted reconsideration.

The Appeal Division found that the new medical evidence did not change the legal or factual matrix already addressed in previous rulings. It held that the Tribunal had properly considered the applicability of res judicata, including the impact of new medical information, and found no arguable case for error.

Ms. Clark then applied to the Federal Court for judicial review of the Appeal Division’s refusal. The Court considered whether the decision was reasonable, applying standards from the Supreme Court’s Vavilov framework. It concluded that the Appeal Division’s reasoning was coherent, transparent, and aligned with established legal principles. The judge emphasized that the focus of the CPP disability determination was the impact of medical conditions on work ability before the qualifying date—not merely the diagnosis label.

Ultimately, the Federal Court dismissed Ms. Clark’s application. It upheld the Tribunal’s and Appeal Division’s conclusions, determining that no breach of natural justice or error of law had occurred. Each party was ordered to bear their own legal costs, and no damages were awarded.