Catastrophic Impairment Benefits in Ontario: What a CAT Designation Means
Updated: 16 hours ago
Last reviewed and updated: September 2026
When a motor vehicle accident causes life-changing injuries, the cost of treatment, rehabilitation, personal support and adapting a home or vehicle can quickly become overwhelming. In Ontario, a catastrophic impairment (“CAT”) designation can significantly increase the accident benefits available to an injured person.
Quick Answer: What Does a Catastrophic Impairment Designation Provide?
For most current Ontario automobile policies, a person with a catastrophic impairment may have access to up to $1 million in combined medical, rehabilitation and attendant care benefits. Optional coverage may increase that limit to $2 million, or as much as $3 million in certain combinations of optional benefits.
By comparison, the standard combined limit for a non-catastrophic impairment is generally $65,000, while treatment for injuries that remain within the Minor Injury Guideline is generally limited to $3,500.
A CAT designation does not mean the insurer pays $1 million as a lump sum. It increases the pool of funding available for eligible, reasonable and necessary expenses, subject to the Statutory Accident Benefits Schedule, the applicable policy and the evidence supporting each expense.
What Is a Catastrophic Impairment in Ontario?
A catastrophic impairment is a specific legal and medical classification under Ontario’s Statutory Accident Benefits Schedule, O. Reg. 34/10, commonly called the SABS.
The word “catastrophic” may be used informally to describe any devastating injury. Under the SABS, however, a serious injury is not automatically a catastrophic impairment. The injured person must satisfy one of the statutory criteria and support the application with the required medical and functional evidence.
The CAT designation discussed in this article applies to Ontario accident benefits claims arising from motor vehicle accidents. A seriously injured person may also have a separate claim against an at-fault driver or another responsible party. Learn more about the difference between an accident benefits claim and a tort claim.
The Three Main Accident Benefits Tiers
For accidents governed by the current benefit structure, the principal medical and rehabilitation funding tiers are:
Classification | Standard limit | What the limit generally covers |
Minor Injury Guideline (MIG) | $3,500 | Medical and rehabilitation treatment for predominantly minor injuries |
Non-catastrophic impairment | $65,000 | Combined medical, rehabilitation and attendant care benefits |
Catastrophic impairment | $1,000,000 | Combined medical, rehabilitation and attendant care benefits |
The limits are set out in section 18 of the SABS. Optional benefits may increase non-catastrophic coverage to $130,000 or $1 million and may increase catastrophic coverage to $2 million. If more than one applicable optional enhancement was purchased, catastrophic coverage may reach $3 million. Your policy or benefit statement must be reviewed to determine the coverage that actually applies.
These figures are maximum pools of available funding, not guaranteed payments. Assessment costs can also reduce the available balance. Different limits and rules may apply to accidents and policies from earlier periods.
Why Does a CAT Designation Matter?
The higher funding limit can support an injured person whose needs may continue for years. Depending on the evidence and the policy, eligible expenses may include:
Physiotherapy, occupational therapy and psychological treatment;
Rehabilitation support workers and personal support services;
Mobility devices, assistive technology and other medical equipment;
Modifications to a home or vehicle;
Attendant care for help with personal care and everyday activities;
Professional assessments and treatment plans; and
Case management services to coordinate a complex rehabilitation program.
For an adult with a non-catastrophic impairment, medical, rehabilitation and attendant care benefits are generally subject to a five-year time limit. That time limit does not apply where the person sustained a catastrophic impairment, although the overall monetary limit and the other rules governing entitlement still apply. See section 20 of the SABS.
The standard maximum for attendant care is also generally higher: up to $6,000 per month for a catastrophic impairment, compared with $3,000 per month for a non-catastrophic impairment. The amount actually payable depends on a properly completed assessment of attendant care needs, the services received and the SABS rules concerning incurred expenses.
As of July 1, 2026, medical, rehabilitation and attendant care benefits remain mandatory under Ontario automobile policies, while many other accident benefits are optional. The accident date, policy date, purchased coverage and the claimant’s status under the policy can all affect entitlement.
What Injuries Can Qualify as Catastrophic?
Section 3.1 of the SABS contains eight pathways to a catastrophic impairment designation for accidents occurring on or after June 1, 2016. In simplified terms, they address:
Paraplegia or tetraplegia meeting the prescribed neurological and functional tests;
Severe impairment of walking or the use of an arm, or certain amputations, meeting the prescribed functional test;
Loss of vision in both eyes meeting the statutory measurements;
Traumatic brain injury in a person who was 18 or older at the time of the accident, based on specified outcome-scale findings and assessment periods;
Traumatic brain injury in a person who was under 18, based on child-specific hospital, imaging, rehabilitation or functional criteria;
A physical impairment, or combination of physical impairments, producing at least 55% whole-person physical impairment under the required methodology;
A combination of physical and mental or behavioural impairments producing at least 55% whole-person impairment under the required methodologies; and
A mental or behavioural disorder producing marked impairment in at least three areas of function, or extreme impairment in at least one area, to the degree required by the regulation.
This is only a plain-language summary. The complete tests, scales and assessment rules appear in section 3.1 of the SABS—the actual catastrophic impairment criteria.
The Two-Year Rule for Criteria 6, 7 and 8
The timing rules for criteria 6, 7 and 8 are frequently misunderstood. Two years is not necessarily an absolute waiting period, and it is not the deadline to apply for CAT status.
Criteria 6 and 7: The 55% Whole-Person Impairment Tests
Criteria 6 and 7 generally become available once two years have elapsed since the accident. They may apply earlier where an assessment conducted by a physician at least three months after the accident determines both that:
The required physical or combined impairments produce at least 55% whole-person impairment; and
The person’s condition is unlikely to improve below the 55% threshold.
Criterion 6 addresses physical impairments. Criterion 7 permits a qualifying mental or behavioural impairment—excluding traumatic brain injury—to be combined with a qualifying physical impairment using the methodologies required by the regulation.
Criterion 8: Marked or Extreme Mental or Behavioural Impairment
Criterion 8 generally becomes available once two years have elapsed since the accident. An earlier application may be possible where a physician gives the specific written opinion required by section 3.1(3): that the impairment is unlikely to improve below marked impairment in at least three functional areas, at a level that prevents useful functioning.
The four functional areas commonly examined in a Criterion 8 assessment are:
Activities of daily living;
Social functioning;
Concentration, persistence and pace; and
Adaptation.
The complete timing rules and early-application exceptions appear immediately after criteria 6, 7 and 8 in subsections 3.1(2) and 3.1(3) of the SABS.
The two-year provisions should not be confused with limitation periods. A person should not wait two years before obtaining advice or building the medical record. In addition, a denial of CAT status or another accident benefit can trigger a separate deadline to start a dispute before the Licence Appeal Tribunal.
Psychological Injuries Can Qualify Under Criterion 8
A catastrophic impairment is not limited to paralysis, amputation or a severe brain injury. Serious psychological injuries may qualify under Criterion 8 when their effect on functioning satisfies the statutory test.
In Ranjan v. Aviva General Insurance Company, 2026 CanLII 15058 (ON LAT), the Licence Appeal Tribunal found that the applicant met the Criterion 8 test based on psychological impairments. The decision illustrates why detailed evidence about everyday functioning can be as important as the diagnostic label itself.
How Do You Apply for a CAT Designation?
The application is made to the accident benefits insurer using an OCF-19 Application for Determination of Catastrophic Impairment.
The application ordinarily requires an assessment by a physician, who may obtain assistance from other regulated health professionals. In a claim involving traumatic brain impairment only, the SABS permits the assessment to be conducted by a neuropsychologist.
Under section 45 of the SABS, the insurer must respond within 10 business days after receiving a properly prepared and signed application. The insurer may:
Accept the catastrophic impairment designation;
Deny it and provide medical and other reasons; or
Require one or more insurer examinations before making its final determination.
If CAT status is denied, the injured person may dispute the denial at the Licence Appeal Tribunal. Strict deadlines may apply, including a general two-year period to challenge an accident benefit denial. The wording and legal validity of the denial can affect when that period begins.
What Evidence Is Important in a CAT Claim?
Catastrophic impairment claims are evidence-intensive. Depending on the criterion, important evidence may include:
Ambulance, emergency department and hospital records;
Diagnostic imaging and operative reports;
Reports from treating physicians and specialists;
Physiotherapy, occupational therapy, psychological and rehabilitation records;
Neuropsychological, psychiatric or functional assessments;
A detailed assessment of attendant care needs;
Evidence from family members and others who observe the person’s daily functioning;
Employment, school and pre-accident records;
Evidence documenting changes in personal care, household activities, concentration, social interaction and ability to adapt; and
A complete and accurate history of pre-existing conditions and post-accident treatment.
A diagnosis alone may not establish the legal test. The evidence must connect the collision-related impairments to the specific medical and functional requirements of the applicable criterion.
What Should You Do After a Serious Ontario Car Accident?
If you or a family member may have sustained a catastrophic injury:
Obtain emergency and ongoing medical care;
Report the accident and apply for accident benefits promptly;
Keep copies of medical records, insurance correspondence, receipts and treatment plans;
Record the assistance required with personal care and daily activities;
Ask for a current accident benefits statement showing the available limits and amounts already used;
Review the policy for optional medical, rehabilitation, attendant care and catastrophic coverage; and
Obtain legal advice early, before evidence is lost or an insurer’s denial period expires.
For more information about the immediate steps to take, read our Ontario car accident guide.
Frequently Asked Questions About Catastrophic Impairment Claims
Do I have to wait two years to apply for catastrophic impairment?
Not always. Criteria 6, 7 and 8 contain two-year timing rules, but the SABS permits earlier qualification when the specific medical evidence and prognosis required by the regulation are present. Other CAT criteria have their own tests and assessment periods.
Does a CAT designation mean I receive $1 million?
No. The designation increases the amount of coverage available for eligible medical, rehabilitation and attendant care expenses. Each expense must still satisfy the policy and the SABS. The insurer does not simply issue a $1 million payment to the injured person.
Can psychological injuries qualify as catastrophic?
Yes. A mental or behavioural disorder may qualify under Criterion 8 if it causes the required marked or extreme functional impairment. Mental or behavioural impairment may also form part of a combined whole-person impairment assessment under Criterion 7.
Can I qualify without a traumatic brain injury?
Yes. Spinal cord injury, severe loss of mobility or arm function, amputation, bilateral vision loss, physical impairment, combined physical and psychological impairment, and qualifying mental or behavioural impairment can all provide separate pathways to CAT status.
Can the insurer refuse my OCF-19 application?
Yes. The insurer may deny the application and may require insurer examinations. A denial can be disputed before the Licence Appeal Tribunal, subject to the applicable deadline and procedure.
Is a CAT claim the same as a lawsuit against the at-fault driver?
No. CAT status relates to statutory accident benefits. A tort claim against an at-fault party is separate and can involve compensation for pain and suffering, income loss, future care and other damages. The two claims should be coordinated because the evidence and benefits may overlap.
Are catastrophic accident benefits available if I caused the collision?
Accident benefits are generally available without regard to fault, subject to the SABS, the applicable policy and the priority rules identifying which insurer must respond. Drivers, passengers, pedestrians and cyclists may all have potential accident benefits claims.
Speak With an Ontario Catastrophic Injury Lawyer
CAT claims require careful coordination of medical, functional and legal evidence. Applying under the wrong criterion, applying without the required prognosis or failing to respond to an insurer’s examination or denial can delay access to important treatment and support.
DR Injury & Disability Law represents seriously injured people in Toronto, the GTA and communities throughout Ontario. We can review the accident benefits coverage, identify the CAT criteria that may apply, coordinate the necessary evidence and challenge an insurer’s denial where appropriate.
Contact DR Injury & Disability Law for a free consultation, or call (416) 668-3944. There are no upfront legal fees, and phone and virtual consultations are available across Ontario.
This article provides general legal information about Ontario law and is not legal advice. Catastrophic impairment tests, insurance coverage and deadlines are fact-specific. The applicable rules may depend on the accident date and policy. A lawyer-client relationship is not created unless confirmed in a written retainer agreement.
