Eighteen months after a serious collision, the treatment funding from your insurer runs out. The physiotherapist wants to continue. The occupational therapist says the home still needs modifications. Your family has been providing care around the clock and cannot keep it up. Then someone mentions a “CAT application” and everything changes. This post explains what a catastrophic impairment designation is, why it matters so much, and how the assessment actually works.
Why the designation matters
Ontario’s Statutory Accident Benefits Schedule sorts injured people into tiers, and the tier determines how much the insurer must fund. For most people, medical, rehabilitation and attendant care benefits are capped at a combined amount in the tens of thousands of dollars and generally end within five years of the accident.
A catastrophic impairment designation moves the injured person into a different world. The combined medical, rehabilitation and attendant care limit rises to one million dollars, monthly attendant care can be funded at a far higher level, and the benefits can continue for life rather than expiring. Where a policy includes the optional benefits that became selectable in Ontario from July 2026, the catastrophic designation also unlocks enhanced amounts under those heads.
For a person with a spinal cord injury, a severe brain injury or a major amputation, the designation is often the difference between a funded recovery and a family carrying the cost alone.
What counts as catastrophic
The definition is set out in the SABS and, for accidents since June 2016, is deliberately specific. An adult is catastrophically impaired if they meet one of the following:
- paraplegia or tetraplegia, assessed against the American Spinal Injury Association standards;
- severe impairment of the ability to walk, or of the use of an arm, including certain amputations;
- loss of vision in both eyes;
- traumatic brain injury meeting defined criteria, assessed using the Glasgow Outcome Scale Extended at set intervals after the accident;
- a physical impairment, or combination of physical and mental impairments, that results in 55 per cent or more whole person impairment under the American Medical Association guides; or
- a mental or behavioural impairment that produces a marked impairment in three or more areas of function, or an extreme impairment in one.
Children under 18 with brain injuries are assessed under separate criteria that account for the way paediatric injuries evolve.
Two features of this list matter in practice. First, most of the categories are medical determinations with defined measurement tools, which means the assessments have to be done by the right professionals using the right instruments. Second, the 55 per cent whole person impairment category allows physical and psychological impairments to be combined. A person whose physical injuries alone would not qualify may reach the threshold once the psychological consequences of the accident are properly measured.
How the assessment works
The process starts with an application to the insurer on the prescribed form, completed by a physician or, for purely psychological impairments, a psychologist. The insurer then decides whether to accept the designation or to require its own assessments.
In almost every contested case the insurer arranges a series of examinations with assessors it selects. These may include a physiatrist, a neuropsychologist, a psychiatrist and an occupational therapist, depending on the categories in play. The reports are gathered into a combined opinion on whether the criteria are met.
If the insurer refuses the designation, the dispute goes to the Licence Appeal Tribunal. That hearing turns on expert evidence, and the quality of the injured person’s own assessments is usually decisive.
Timing
There is no deadline to apply. Some categories can be established early; a complete spinal cord injury is apparent from the first imaging. Others depend on time. The brain injury criteria, for example, use outcome ratings taken at defined points after the accident, and the whole person impairment assessment is generally done once the person has reached maximum medical recovery. Applying too early with incomplete evidence can produce a refusal that then has to be fought through the tribunal.
This is why the decision about when to apply is a strategic one and should be made with the whole medical picture in view.
What the designation does not do
A catastrophic designation is an accident benefits concept. It does not automatically satisfy the threshold for general damages in a lawsuit against the at-fault driver, although in practice the two rarely diverge. It also does not oblige the insurer to approve every treatment plan; each request is still assessed for reasonableness and necessity. What it does is remove the ceiling that would otherwise stop the funding altogether.
We explain how accident benefits and the tort claim run alongside each other in our post on the two parallel tracks, and our motor vehicle accidents page describes how we manage both for seriously injured clients.
Get the application right the first time
A catastrophic impairment application is one of the most consequential documents in an injured person’s recovery. If you or a family member may qualify, book a consultation with Kabir & Alam Lawyers before the insurer’s assessments begin. We can review the medical evidence, identify the categories that apply, and arrange the assessments needed to support the application properly.