Introduction

On February 25, 2026, the Divisional Court released 2026 ONSC 974 (CanLII), and rewrote the MIG gate for Ontario concussion files. The holding is categorical: a concussion is not a minor injury. The MIG turns on the injury, not the impairment. An injury with catastrophic potential cannot also be minor.

Since then, adjudicators have applied it with teeth: files are coming out of the $3,500 cap, plans are getting funded, and two 2026 decisions granted special awards against insurers still paying under the old rule. That lines up with the pattern we tracked in s. 10 awards against Ontario insurers.

For clinics, a concussion claim is now a documentation problem, not an uphill battle. The right professional, the right words, and the right records get the file out almost automatically. The wrong ones keep it capped.

The Ruling That Changed the Gate

Under section 18(1) of the Schedule, medical and rehabilitation benefits are capped at $3,500 when injuries are "predominantly minor": sprains, strains, whiplash, contusions, abrasions, lacerations, and subluxations under section 3(1). A concussion was never on that list, but insurers routinely slotted "minor" concussion files into the MIG.

The Divisional Court's decision ended that practice. The Court's reasoning, quoted in 2026 CanLII 39697 (ON LAT), is structural: the defining factor for the MIG is the injury, not the impairment arising from it. A brain injury with catastrophic potential cannot be "minor." The Tribunal treats the decision as binding even in hearings that predate it, describing the determination as "indisputable."

Two consequences for your clinic:

1. Once the diagnosis is in, removal is automatic. Unlike the chronic pain route, which needs pain plus measurable functional impairment, the concussion route needs no impairment showing at all. The injury itself is non-minor. 2. The old routes are fallbacks now. Chronic pain and psychological arguments matter only where the concussion diagnosis is missing or defective.

Who Can Diagnose a Concussion

The case law has consolidated on scope, and it maps to your clinic's professional mix:

  • Physician, nurse practitioner, or neuropsychologist: yes. In 2025 CanLII 3764 (ON LAT), no neurologist referral was required, and a family physician's conduct (noting closed head injury symptoms, recommending concussion-based physiotherapy) counted as a diagnosis. The rule from that decision: "In Ontario, a physician, a nurse practitioner, or a neuropsychologist can diagnosis a concussion." 2026 CanLII 45603 (ON LAT) confirmed the balance of Tribunal case law treats a physician's diagnosis as sufficient.
  • Physiotherapist: no. In 2026 CanLII 15081 (ON LAT) a physiotherapist's concussion diagnosis received "no weight," even with concussion-management certification. 2025 CanLII 45359 (ON LAT): a concussion is a mild traumatic brain injury requiring a clinical diagnosis, which a physiotherapist is not qualified to make.
  • Chiropractor: cannot originate, can corroborate. In 2026 CanLII 80202 a chiropractor's OCF-3 concussion diagnosis was out of scope and given no weight. But in 2026 CanLII 39697, the Tribunal accepted a chiropractor's post-concussion syndrome diagnosis (physiologic, cervicogenic, and vestibular-ocular subtypes) as corroboration of the hospital's diagnosis. The difference: who originates the diagnosis versus who documents the syndrome.
  • The OCF-3 is not a diagnosis. A template form listing concussion, identical to an earlier accident's form, got zero weight in 2025 CanLII 5883.

This is the same scope discipline from the vestibular-ocular assessment playbook: who produced the finding is part of whether it gets weight.

What a 2026 Win Looks Like

Three 2026 decisions show the pattern to copy.

The award case. In 2026 CanLII 39697, the applicant struck a curb and attended hospital days later, where the emergency physician diagnosed a concussion. The chiropractor then documented post-concussion syndrome subtypes. The insurer kept the file in the MIG, citing delayed hospital attendance, return to work, pre-existing concussions, and a delayed application. The adjudicator rejected every argument; the two treating diagnoses were "clear and uncontroverted evidence." Result: removal, two funded plans, and a 25% special award because the insurer maintained a MIG position despite holding hospital records that diagnosed the concussion.

The two-doctors-plus-CT case. In 2026 CanLII 15081, the family physician wrote "brain bleed vs concussion" on the accident date and sent the applicant to emergency, where a CT returned a final diagnosis of "concussion injury of brain." The insurer's section 44 report never commented on whether a concussion occurred, which proved fatal. Plans were funded and an award granted: either the insurer was mistaken that a concussion is minor, or it disregarded clear and objective evidence.

The contemporaneous-record case. In 2026 CanLII 10374 (ON LAT), the emergency physician diagnosed a concussion on the accident date, and the family doctor consistently recorded symptoms and referred the patient to a neurologist and concussion clinic. The insurer's section 44 reports came two years later. The adjudicator preferred the contemporaneous record, removed the file from the MIG, and funded the neurological assessment.

The common thread: a diagnosis in the contemporaneous record by an in-scope professional, plus corroboration. Referral, CT imaging, dense follow-up notes, a PCS diagnosis. The more, the better.

Where Claims Still Fail

This year's losses are just as instructive, because they all fail the same way: no actual diagnosis in the record.

  • "Suspected" and "might be" are not diagnoses. In 2026 CanLII 80196 (ON LAT), the family doctor wrote "suspected concussion," the hospital chart was never produced, and the applicant passed the Buffalo treadmill test; the file stayed in the MIG. In 2026 CanLII 2275, the ER note said the headache "might be concussion," no practitioner ever diagnosed one, and the file stayed capped.
  • A single unsupported line is not a diagnosis. In 2025 CanLII 28447, a walk-in clinic line reading "whiplash injury and mild concussion" stood alone: no symptom documentation, no referrals, no imaging.
  • A late report cannot manufacture what the chart never showed. In 2025 CanLII 116965, the contemporaneous family doctor records contained no concussion reference at all, and the applicant hit her head in a later cycling fall. The neurologist's later diagnosis got no weight because it ignored both facts.
  • A physiotherapist-only diagnosis fails. In 2025 CanLII 45359, the OCF-3 said concussion, but the family doctor's records were never produced, and the physiotherapist's diagnosis was rejected on scope.

The words that keep files in the MIG are "suspected," "query," and "might be." The fix is corroboration: your PCS documentation, a referral, a chart that actually gets produced.

Removal Is Not Funding

One more pattern deserves a warning: the most common mistake clinics make after a win.

In 2025 CanLII 3764 (ON LAT), the applicant won removal on the family doctor's records alone, and every plan was denied because the submissions never addressed goals, how they would be met, or whether costs were reasonable. In 2025 CanLII 135593 (ON LAT), removal was granted and all three plans failed the same way, including a chiropractor's concussion assessment proposed eight months post-accident.

The funded plans did the opposite: in 2026 CanLII 10374, the assessment was tied to persistent concussion symptoms lasting over a year; in 2026 CanLII 15081, the physiotherapy plans were tied to post-concussion recovery and supported by objective testing. Administrative add-ons still get stripped out, as covered in the OT planning fees decision. And the $2,000 assessment cap still applies after removal: 2026 CanLII 83302 confirms one assessment means one cap, no unbundling.

The Clinic Playbook

1. Spot it early and send for the diagnosis. If the ER or family doctor wrote "suspected," or the patient reports a head strike, dizziness, or cognitive symptoms. Make your PCS documentation the corroboration. Document the subtype, symptom cluster, functional limitations, and treatment response in every note. Suspicion plus your PCS record carried removal in 2025 CanLII 135593 and 2026 CanLII 39697. 2. Write the contemporaneous record for the Tribunal. Symptoms, timeline, mechanism, objective scores like the SACT-2 or Buffalo treadmill, and referrals. This is what adjudicators quote. 3. Never originate the concussion diagnosis. A physio or chiro diagnosis on the OCF-3 gets zero weight and can poison the report. Treat and document PCS. Leave the diagnosis to the physician. 4. Get the medical records. If you KNOW there is even a suspicion of concussion from a hospital or family doctor its a wins; its absence sank 2026 CanLII 80196. 5. Get the family doctor on board. Send a written request for them to investigate the PCS 5. Tie every plan goal to the concussion. Each OCF-18 needs its own goals, costs, and link to concussion symptoms. A plan that is not congruent with concussion treatment gets denied even after removal. 6. Watch for the award angle. Where the insurer held the file in the MIG after receiving concussion records, adjudicators have granted special awards. Flag those files early.

Conclusion

The MIG gate for concussion claims has a new shape, and the winning files all look the same: an in-scope diagnosis in the contemporaneous record, corroborated by PCS documentation, imaging, and referrals, with every plan tied to the diagnosed concussion.

Treat the post-ruling gate as a documentation problem: the right professional, the right words, the right records, on time. That is the difference between a file capped at $3,500 and one that gets its plans funded, and between an insurer that pays quietly and one that pays a special award. If your clinic's billing discipline needs the same refresh, start with the 2026 decisions affecting HCAI invoicing.