Occupational injury claims before the CNESST

Overview

An injured worker needs both a legally compensable occupational injury (lésion professionnelle) and a properly assembled claim. Reporting an event to a supervisor, obtaining treatment, and filing with the Commission des normes, de l’équité, de la santé et de la sécurité du travail (CNESST) perform different functions. Completing one does not automatically complete the others. The same distinction applies after a decision: asking an agent to correct an error does not replace a timely application for administrative review.

The Quebec compensation process combines medical information, factual investigation, prescribed payments and opportunities to challenge decisions. Its starting point is the Act respecting industrial accidents and occupational diseases (AIAOD), particularly ss. 265–272 and 349–365. This lesson follows a claim from the first report through the administrative stage and identifies when the matter moves to the Tribunal administratif du travail (TAT). It addresses procedure; the substantive conditions for recognizing an injury remain a separate issue.

Learning Objectives

• Identify the notices, forms and medical information required to advance an occupational injury claim.
• Select the applicable filing period, its starting event and the appropriate request for relief from lateness.
• Distinguish reconsideration, administrative review and a contestation before the TAT while protecting confidential information.

Preserve the claim from the first report

The worker must advise the immediate superior or another employer representative before leaving the establishment, if able, or otherwise as soon as possible. If the worker dies or cannot act, the representative takes over this obligation. Under ss. 265–266 AIAOD, ordinary language describing the place and circumstances is sufficient if the worker is properly identified. The employer must facilitate communication. A technically sophisticated legal account is unnecessary at this stage.

A delayed notice does not automatically forfeit compensation. The statute does not attach that sanction to the notice obligation. Delay can nevertheless create an evidentiary problem: witnesses forget, physical conditions change, and the connection between work and symptoms becomes harder to establish. The worker should explain the delay and preserve contemporaneous messages, shift records and medical consultations. A coherent explanation matters more than adding legal terminology to an incomplete chronology.

The accident register also serves a distinct purpose. Section 280 AIAOD requires the employer to record accidents that do not prevent the worker from working beyond the day the injury appears and to obtain the worker’s signature confirming the accident and its date. The register can support later proof, but students should never equate a register entry with every required claim form. A minor event can develop into a disputed condition, making an accurate initial description useful even when no extended absence occurs.

The worker’s claim (réclamation du travailleur) and the employer’s reimbursement request have different authors and objectives. Under s. 270 AIAOD, the worker submits the prescribed claim and gives the employer a completed, signed copy; the employer must provide assistance and necessary information. Section 279 AIAOD permits representation for notices and claims. For occupational disease, s. 272 AIAOD requires identification of employers for whom the worker performed potentially causative work. A claim should therefore reconstruct relevant employment history, rather than identify only the employer at diagnosis.

A useful file separates the event chronology from the procedural chronology. The first records tasks, exposure, symptoms, consultations and incapacity. The second records notices, forms, decisions, receipt and challenges. This prevents the date of a report from being confused with the date of an injury, or the date printed on a decision from being treated automatically as its notification date. Keep the original document and proof of its transmission together. When accounts differ, identify the difference expressly and seek an explanation rather than silently rewriting the first account.

Calculate the filing period from the correct event

Ordinary periods and occupational disease

The general period is six months, but a worker's claim for an injury resulting from sexual violence suffered by that worker has a two-year period under ss. 270–272 AIAOD. The beneficiary's claim following the worker's death remains subject to six months: from death under s. 270, or from learning that the death resulted from an occupational disease under s. 272. Applying six months mechanically to every occupational injury would erase a statutory distinction. For a historical problem, the dates of the injury and the legislative change also require attention; the applicable transitional provisions determine whether the new period governs that claim.

Section 270 AIAOD addresses injuries causing incapacity for more than fourteen complete days or permanent physical or psychological impairment, and provides the applicable period from the injury or death. Section 271 AIAOD addresses, among other cases, an injury that does not prevent work beyond the day it appears and situations where no employer must pay under s. 60 AIAOD. The statutory categories explain why the anticipated duration of incapacity belongs in the initial interview.

For occupational disease, s. 272 AIAOD starts the period when the worker learns of the disease and its occupational connection. The inquiry is factual. Symptoms alone do not necessarily establish knowledge of an occupational disease; waiting for absolute medical certainty can also be unjustified. In Perron c. Gilles Veilleux ltée, 2024 QCCA 824, the Court of Appeal reiterated the need for knowledge of both the disease and its relationship with work. Collect what the worker was told, by whom, and when, rather than using the first medical appointment as an automatic starting date.

The words governing filing under s. 271 AIAOD have generated differing approaches where the worker initially lacks a concrete interest in compensation. The predominant judicial approach starts the period from the injury, while another approach associates its start with an existing interest in claiming. Absence of an immediate interest can also be relevant to relief from lateness under s. 352 AIAOD. An educational answer should identify this disagreement and assess a protective filing, rather than present delayed incapacity as a universally accepted restart.

Section 272.1 AIAOD provides a specific rule where a decision in a psychological harassment proceeding reserves the compensation-related aspect because an occupational injury appears probable. Subject to its conditions, including the absence of an already filed claim or election notice, time runs from that decision. The relationship with s. 123.16 of the Act respecting labour standards must be examined. The rule also extends to a corresponding decision made in a harassment proceeding arising under another statute or an agreement. A harassment complaint and a compensation claim remain distinct proceedings with different questions and consequences.

Worked example: knowledge of an occupational disease

Factual Scenario

A worker experiences hand symptoms in January. A consultation initially identifies several possible causes. In April, a health professional identifies a disease and explains that repeated exposure at the worker’s job is the probable cause. The worker submits a claim in August and lists the relevant former employers.

Relief from lateness

Section 352 AIAOD permits the CNESST to extend a period for exercising a right or relieve a person from the consequences of missing it where a reasonable ground (motif raisonnable) explains the failure. Abel et Fédération interprofessionnelle de la santé du Québec, 2012 QCCA 75, distinguishes that standard from impossibility to act. The explanation must connect the circumstances to the missed deadline, with supporting facts and evidence of diligence.

Prepare two analyses separately: whether the filing was late under the correct starting rule, and, if so, whether relief should be granted. Medical incapacity, misleading information and administrative confusion require factual proof. A late applicant should document the period of difficulty, steps taken, and promptness after the obstacle ended. A bare assertion of stress gives the decision-maker little basis for deciding whether the explanation reasonably accounts for the delay.

Coordinate treatment, medical reports and initial payments

Under s. 190 AIAOD, the employer must provide immediate first aid and arrange necessary transport from the establishment, bearing its cost. On a construction site, the statutory obligation applies to the principal contractor. The obligation responds to the worker’s condition; it should not await the administrative acceptance of the claim.

Where incapacity extends beyond the day the injury appears, s. 267 AIAOD requires the worker to provide the medical certificate (attestation médicale) contemplated by s. 199 AIAOD to the employer. If no employer must pay under s. 60 AIAOD, it goes to the CNESST. The certificate identifies the diagnosis and anticipated consolidation. It helps establish immediate obligations, while the claim supplies the worker’s factual account and request for benefits.

The payment sequence has two distinct rates. When the worker becomes unable to perform the employment while at work because of the occupational injury, section 59 AIAOD requires the employer to pay net salary for the remaining part of that working day that the worker would normally have worked. The first day of incapacity may differ from the injury date. Section 60 AIAOD provides 90% of net salary for each day or part of a day the worker would ordinarily have worked during the fourteen complete days following the beginning of incapacity, subject to the statutory conditions. Those fourteen days describe the relevant period, not an entitlement to fourteen scheduled shifts. The payment constitutes the initial income replacement indemnity (indemnité de remplacement du revenu).

The employer sends its notice and reimbursement request under s. 268 AIAOD, with a copy of the medical certificate, and provides the worker a signed copy under s. 269 AIAOD. Transmission is required within the two days following return if return occurs within the fourteen complete days, or following the end of that period if absence continues. Disagreement about admissibility can be stated in the form; the dispute does not permit the employer simply to replace the prescribed process with silence.

The health professional in charge produces reports as the condition evolves. Sections 199–203 AIAOD address the initial certificate, summary report, significant treatment changes, requested clarifications and final report. The summary report is due within six days of the first examination in the situation specified by s. 200 AIAOD; a requested clarification under s. 202 AIAOD is due within ten days. The final report addresses consolidation, permanent impairment and functional limitations when the statutory conditions apply.

Section 224 AIAOD binds the CNESST to the health professional’s conclusions on the prescribed medical subjects, subject to the statutory medical evaluation process and s. 224.1 AIAOD. This does not mean the professional decides every legal issue, including occupational causation. A disagreement about a binding medical conclusion must be directed through the appropriate medical route; an ordinary administrative review cannot simply disregard the binding rule.

The five medical subjects must also be kept separate from one another. A diagnosis identifies the condition; consolidation concerns its stabilization; treatment conclusions concern the care required; permanent impairment and functional limitations address different consequences. A certificate mentioning one subject does not necessarily answer all five. Read each report for the conclusion actually expressed and identify what remains missing. In an application problem, explain which legal decision needs that information: recognition of the claim, continuation of treatment and assessment of capacity should not be compressed into a single unexplained finding that the worker is either “injured” or “recovered.”

Worked example: the employer pays while disputing admissibility

Factual Scenario

A warehouse employee leaves halfway through a shift after an injury, supplies the required certificate, and remains unable to work for nine complete days. The employer disputes that the event occurred at work. The employee normally works weekdays.

Obtain and challenge an administrative decision

The initial decision and procedural fairness

Section 349 AIAOD gives the CNESST exclusive initial authority over matters assigned to it, except where legislation assigns a matter elsewhere. Sections 351 and 354 AIAOD require decisions grounded in the merits and justice of the case, written reasons and prompt notification. The obligation of procedural fairness (équité procédurale) is further expressed in ss. 2, 4 and 6–8 of the Act respecting administrative justice. Before an adverse benefits decision, the administration must ensure that the person can supply useful information and complete an insufficient file.

Administrative review (révision administrative) remains an administrative process. Under ss. 358–358.5 AIAOD, an affected person generally has thirty days from notification to request review in writing, identifying the decision, its subject and the main reasons for disagreement. The parties receive an opportunity to make observations, and the reviewer decides on the file. The reviewer may confirm, reverse or modify the decision and make the decision that should have been made, within the subject matter initially decided.

Section 358.2 AIAOD provides the particular reasonable-ground mechanism for a late review request. Blanchette et Verreault Navigation inc., 2016 QCTAT 288, illustrates the contextual inquiry: established medical difficulties or misleading information can support relief, while simply waiting to complete medical evidence or deciding whether to contest generally does not. File the review request within time and supplement the evidence as permitted.

Reconsideration has a separate function

Reconsideration (reconsidération) under s. 365 AIAOD permits correction of any error within ninety days of the decision, subject to the limits where an administrative review decision has been rendered or the decision has been contested directly before the TAT under s. 360 AIAOD. A second branch permits reconsideration within ninety days of learning an essential fact that was unknown when the decision was made. A different medical opinion is not automatically such a fact.

The CNESST must give prior notice to the persons originally notified. Financing decisions follow their own statutory and regulatory treatment; the general reconsideration power cannot simply be imported. Nor is the CNESST’s refusal to reconsider for an error ordinarily reviewable under s. 358 AIAOD. Because reconsideration is optional and has different conditions, a request to an agent should never be treated as an automatic extension of the thirty-day review period.

Worked example: preserve review while seeking a correction

Factual Scenario

A worker receives a refusal based on an incorrect employment date. Ten days later, the worker asks the agent to reconsider and supplies payroll records. No response arrives before the ordinary review deadline.

Identify the next forum and control access to information

Most administrative review decisions can be contested before the TAT within sixty days. Section 359 AIAOD also permits a person who requested review to proceed when the CNESST has not decided within ninety days of receiving the request; where the applicant requested time for observations or documents, the starting point adjusts to their presentation or production. This is an access mechanism following administrative delay, not a declaration that the original claim succeeds.

Section 360 AIAOD permits a choice between thirty-day administrative review and direct sixty-day TAT contestation for designated medical evaluation decisions and decisions on financing or imputation. If the same decision is both under review and contested, the TAT refers it to the CNESST for review. Decisions on statutory reprisals also have a distinct direct route. Temporary assignment, preventive reassignment, refusal of dangerous work and inspection decisions can instead engage ten-day review and contestation periods under the Act respecting occupational health and safety, including ss. 37.1–37.3 and 191.1–193. Identify the decision’s subject before selecting a deadline.

A pending challenge generally does not suspend a CNESST decision. Sections 361–362 AIAOD contain specific exceptions, notably for designated lump-sum bodily injury and death benefits, and financing decisions at the review stage. Continued legal effect, ultimate entitlement and possible recovery are different questions. Preserve proof of notification and consult the actual operative terms instead of assuming every contested payment stops.

Confidentiality (confidentialité) shapes preparation. Sections 36–41 AIAOD distinguish the beneficiary’s access, the employer’s authorized administrative access, and medical information. The employer has no direct right of access to the medical file that the CNESST holds concerning the occupational injury. Access to that file proceeds through its designated health professional, whose report must stay within what is necessary to exercise the employer’s statutory rights. Information obtained through the statutory access regime cannot be repurposed freely. The worker must be advised of prescribed disclosures, and authorized information must be provided within a reasonable time.

Practice Checklist

• Separate the employer notice, accident register, medical certificate, employer reimbursement request and worker claim.
• Identify the injury category, the appropriate starting event and whether the two-year sexual-violence period applies.
• Record knowledge of an occupational disease and its work connection using dated factual and medical evidence.
• Analyse timeliness before seeking relief, and support the reasonable ground with a complete chronology.
• Distinguish salary for the remainder of the working day when incapacity begins, the fourteen-day payment period and subsequent benefits.
• Identify binding medical questions and use the correct route to dispute them.
• Calendar notification, review and contestation periods separately; do not rely on reconsideration to preserve review.
• Check special ten-day routes, immediate effect and the permitted scope of file access.