Introduction

A section 44 insurer examination came back against your patient. The diagnosis you made is described as soft tissue only. The treatment plan is denied, and the denial letter quotes the IE report almost word for word. What now?

The rebuttal report is the tool clinics use to answer an IE, and the Licence Appeal Tribunal has been unusually consistent about what makes one work. Across 17 LAT decisions released between early 2025 and late 2026, a clear pattern emerges: rebuttals that answer the IE's specific reasoning win. Rebuttals that simply repeat the diagnosis lose.

This guide walks through the rules, the wins, the losses, and a checklist your clinic can run before sending its next rebuttal. If the IE report leans on psychological testing, start with our primer on validity testing and the SIMS at the LAT, because that is where most rebuttals come undone.

Rule One: The Onus Never Shifts

One misconception kills more rebuttal strategies than any other: the belief that the insurer has to disprove your diagnosis. It does not. As the Tribunal put it in 2025 CanLII 132394, it is not the respondent's onus to disprove the applicant's claim by way of a rebuttal report. The applicant, meaning your patient and the reports that support them, carries the burden of proof from start to finish. We broke that ruling down line by line in our case note on the onus that never shifts.

That does not make the rebuttal optional. It makes it strategic. The same body of case law shows that once a claimant files a rebuttal, the insurer has to actually engage with it on the file. In 2025 CanLII 35966, the insurer received section 25 reports plus three rebuttal letters on an income replacement dispute, and the adjuster logs showed no engagement at all. No follow-up paper reviews, no response on the record. The Tribunal awarded a 25 percent special award on the IRB. Insurer silence in the face of a rebuttal report is evidence of unreasonable conduct, and in comparable circumstances the LAT has gone as high as 40 percent.

What a Winning Rebuttal Looks Like

It answers the specific opinion, not the diagnosis

In 2026 CanLII 23850, the insurer's examiner rejected a medical cannabis plan by leaning on a 2023 study. The rebuttal dissected that exact study and showed it does not distinguish medical from recreational cannabis, then supplied research tied to the applicant's trauma-based pain. The plan was approved in full at $2,857.77.

Compare that to the losses. In 2025 CanLII 92271, the rebuttal reasserted the same depression and phobia diagnoses but, in the Tribunal's words, did not comment on any objective testing results and ignored the IE's validity findings. The MIG held and the application was dismissed. In 2025 CanLII 111701, a 2022 rebuttal rating of 30 percent whole person impairment went up against a 2024 insurer rating of 15 percent. The newer rating won. A rebuttal that does not refresh its numbers and answer the current IE is a historical document, not an argument.

The same logic applies when the insurer's rebuttal is the thin one. In 2026 CanLII 64898, the insurer "argued nothing substantive in rebuttal other than lack of medical evidence." The result: MIG removal, plus the psychological assessment, orthopaedic assessment, and chronic pain plans were all approved.

It engages the testing head-on

When the IE report includes symptom validity tests, the rebuttal must address them directly. Silence reads as concession. This is the single most common point where rebuttals lose, and it overlaps heavily with what makes any psychological assessment credible at the Tribunal.

It covers every plan and every reason

The scope of the rebuttal sets the scope of the win. In 2026 CanLII 71312, an occupational therapist's rebuttal on falls and fall prevention was given more weight than the IE's OT report. The OT, speech language, and physiotherapy plans were approved. The rehab assistant plan was denied, because the rebuttal did not speak to it. Same report, different outcomes per plan.

That per-plan pattern repeats across the Tribunal. In 2026 CanLII 12707, the treating psychologist never explained why a third course of therapy should be 14 sessions at 90 minutes instead of the IE's 12 at 60. The extra sessions were denied for lack of rebuttal. And where a file mixes disciplines, outcomes can split the same way, as we covered in our breakdown of a case where the psych plans were denied while the chiro plan was approved. When a clinic submits one plan with five line items, every line item needs its paragraph.

Timing and Process: The Two-Edged Sword

Late rebuttals are not automatically dead. In 2026 CanLII 51019, a neurology rebuttal dated September 2025 was served in January 2026. The objection was rejected because the insurer had received it within the exchange window and could not show real prejudice. The post-104 week income replacement benefit was granted.

But lateness has a cost. In 2026 CanLII 56628, a rebuttal authored months earlier was filed with the submissions and no motion. It was admitted, but its weight was discounted for late service, and the application was dismissed. The practical line: if you are serving late, bring a motion and explain why, or expect the report to be read with suspicion.

The process rules cut the other way too. In 2026 CanLII 80193, the insurer served an expert addendum one business day before its own submissions, breaching the 60-day exchange rule and prejudicing the applicant's ability to seek a rebuttal. The Tribunal approved the cognitive and vocational assessments plus yoga, and ordered $500 in costs against the insurer. In 2025 CanLII 132431, the insurer's paper-review rebuttal IEs were excluded outright because they were obtained without fresh section 44 notice. The plans were approved and a 10 percent award followed. Insurer rebuttal machinery needs notice just like any other IE, even when the exam is only a paper review.

And the "we had no time to rebut" argument fails when the timeline says otherwise. In 2025 CanLII 129096, the insurer moved to exclude the claimant's catastrophic impairment reports, claiming it had no chance for section 44 rebuttals. It had held the reports for months. The exclusion was denied and the non-earner benefit was granted.

What This Means for Your Clinic

Before your clinic sends a rebuttal, run this checklist:

1. List every denial reason in the insurer's letter, then confirm the rebuttal answers each one. 2. Read the IE report for validity indices and test results, and respond to each finding, not just the diagnosis. 3. Match the rebuttal to every plan and every line item in dispute. Silence kills the unaddressed item. 4. Refresh the clinical picture. A rebuttal built on a two-year-old assessment loses to a current IE. 5. Serve on time. If you cannot, bring a motion instead of burying the report in submissions. 6. Log everything. If the insurer receives the rebuttal and does nothing, that silence is evidence for a special award.

The insurer's file conduct matters as much as your report. The LAT has now made insurers pay in a dozen section 10 special award cases in 2026, and an ignored rebuttal is one of the cleanest paths onto that list. A denied plan also carries downstream billing consequences, which we walked through in our 2026 roundup of decisions that affect HCAI invoicing.

Conclusion

A rebuttal report is a written argument, not a second opinion. The ones that survive at the LAT answer the examiner's reasoning point by point, confront the testing, cover every plan in dispute, and arrive on time. The ones that fail mostly do the same thing: they repeat the diagnosis and hope it lands harder the second time.

If your clinic treats MVA patients in Ontario and wants to stay ahead of the rulings that affect your approvals, CACF tracks these decisions so you do not have to read every one yourself.