WSIB and Medical Cannabis: How Injured Ontario Workers Get Coverage

If you were injured at work in Ontario and your doctor has raised medical cannabis, the obvious question is whether WSIB will pay for it.

The short answer is: sometimes, but the criteria are narrow and specific. This article sets out exactly what WSIB requires, based on its published policy, so you know before you apply whether your situation is likely to qualify.

WSIB’s starting position

It is worth understanding the framing. WSIB’s policy states that medical cannabis is not necessary, appropriate or sufficient treatment for most medical conditions, citing the lack of strong and consistent evidence of therapeutic efficacy alongside the known harms of cannabis use. It then allows that in limited circumstances it may be appropriate as a result of a work-related injury or disease.

That is not a barrier designed to frustrate you. It is a treatment-of-last-resort framing, and understanding it changes how you approach the claim.

The five designated conditions

This is the first gate, and the one that stops most claims. WSIB will only consider entitlement where the worker has one of five designated conditions, and that condition is clinically associated with the work-related injury or disease:

1. Neuropathic pain, meaning pain arising as a direct consequence of a demonstrable lesion or disease affecting the somatosensory system, for example pain caused by a traumatic nerve injury
2. Spasticity resulting from a spinal cord injury
3. Nausea and vomiting associated with cancer chemotherapy
4. Loss of appetite associated with HIV or AIDS
5. Pain and other symptoms experienced in a palliative state

If your work injury has caused general musculoskeletal pain rather than nerve pain, this is where most claims fail. It is worth having your treating professional assess specifically whether your pain is neuropathic, because that distinction determines everything that follows.

The seven entitlement criteria

Beyond palliative care situations, all of the following must be met:

1. The worker has a designated condition.
2. The treating health professional authorises medical cannabis to treat that condition.
3. The worker has exhausted conventional treatments for the condition.
4. An appropriate clinical assessment has been conducted.
5. The benefits outweigh the risks for that worker.
6. The dose and route of administration are appropriate.
7. The worker has a valid medical document or written order.

What “exhausted conventional treatments” actually means

This is more specific than it sounds. WSIB requires adequate trials of appropriate conventional treatments, documented in your medical records, which were either ineffective or not tolerated.

For neuropathic pain in particular, an adequate trial of a treatment will usually be three months, and appropriate conventional treatment means the worker has tried at a minimum three first-line or second-line treatments plus a pharmaceutical cannabinoid.

Practically: the documentation of what you tried and what happened is as important as the cannabis authorisation itself.

Who is excluded

WSIB’s policy lists contraindications where risks will generally outweigh benefits. Medical cannabis is contraindicated for individuals who:

• Are under the age of 25
• Have a personal or strong family history of psychosis
• Have a current or past cannabis use disorder, or another substance use disorder
• Are pregnant, planning to become pregnant, or breastfeeding
• Have cardiovascular disease
• Have severe liver or kidney disease

Caution also applies for workers with a current mood or anxiety disorder, heavy alcohol users, those taking opioids or benzodiazepines, and those with cardiovascular risk factors.

The dosing and format rules

These limits surprise a lot of applicants, and getting them wrong is a common reason a medical document is rejected. WSIB requires that:

• The route of administration must not involve smoking.
• The daily quantity of dried cannabis, or equivalent, must not exceed three grams.
• The product should be CBD-rich with minimal THC.
• For products intended for inhalation, THC concentration must not exceed 90 milligrams per gram, which is nine per cent THC by weight.
• THC must not exceed 30 milligrams per day.

There is an exception process. WSIB may approve more than three grams daily, more than 30 milligrams of THC per day (though outside palliative care never above 75 milligrams), or a higher THC concentration, where it is satisfied the requested amount is necessary, appropriate and sufficient for the worker.

Where vapourising is the approved route, WSIB will also cover the reasonable cost of a vapouriser obtained from a licence holder, with replacements generally limited to once every two years. Our guide to THC and CBD explains why the CBD-rich requirement matters for what you will actually be prescribed.

Two rules that catch people out

First, approval must come before purchase. WSIB is not responsible for costs incurred where entitlement was not allowed, where the product does not comply with approved limits, or for amounts above what was approved. Buying first and claiming later does not work.

Second, the source matters. Payment is only made where the cannabis is obtained from a licence holder with whom you are registered as a client, or from a hospital. No payment is made where cannabis is obtained from any other source, including personal production, designated production, or a recreational retailer.

What happens after approval

Entitlement is not permanent. WSIB reviews it no more than three months after initial entitlement or when your dose changes, and then at intervals of no more than six months. Ongoing entitlement requires clinical reassessment showing the treatment remains necessary and effective.

Entitlement can be suspended or discontinued where there is insufficient progress toward treatment goals, where you experience adverse or substantial side effects, where cannabis use disorder develops, or where the treatment impedes recovery. You must also tell WSIB about any material change in your circumstances.

If your claim is refused

A refusal is not necessarily the end. WSIB has a formal process for disagreeing with a decision about a claim. Before appealing, it is worth identifying which criterion failed. Usually it is the designated condition or the documentation of exhausted conventional treatments, and both are sometimes fixable with better clinical evidence. Our article on Employment Insurance and compensation for work accidents covers the wider support picture for injured workers.

If WSIB coverage is not available to you, other routes may be. See eligible for coverage, our guide to applying for medical cannabis coverage step by step, and our article on whether your health insurance covers medical cannabis.

Frequently asked questions

Next step

If you have a work-related injury and think you may meet the criteria, the most useful first step is a proper clinical assessment of whether your condition qualifies and whether your treatment history supports a claim. Apply now or contact our team to talk it through. You can also read more about us and the coverage programs we work with.