If you or a family member has suffered a life-changing injury in a motor vehicle accident, one of the most important accident-benefit questions may be whether the impairment qualifies as catastrophic under Ontario law.
A catastrophic impairment, often called a CAT impairment, is a specific legal designation under Ontario’s Statutory Accident Benefits Schedule (SABS). A CAT determination can significantly increase the medical, rehabilitation and attendant care benefits available through auto insurance. It can also affect the resources available to support recovery and long-term care.
But a serious or devastating injury does not automatically qualify as a catastrophic impairment. Ontario applies specific medical and functional criteria, and insurers can dispute whether those criteria have been met.
HIMPRO’s personal injury lawyers help people with serious motor vehicle injuries build and protect catastrophic impairment claims, challenge insurer denials and delays, and work to maximize the benefits and compensation available to them.
What Does Catastrophic Impairment Mean in Ontario?
For accidents occurring on or after June 1, 2016, Ontario’s SABS sets out several routes by which an impairment can qualify as catastrophic. The legal tests are detailed and depend on the type of injury, medical findings, functional limitations and, in some cases, the time that has passed since the accident.
The current criteria include:
- paraplegia or tetraplegia meeting the applicable neurological and functional criteria;
- severe impairment of walking or use of an arm, or certain amputations;
- loss of vision in both eyes meeting the prescribed thresholds;
- certain traumatic brain injuries in adults;
- specific traumatic brain injury criteria for people who were under 18 at the time of the accident;
- a physical impairment or combination of physical impairments resulting in 55% or more whole-person impairment;
- combined physical and mental or behavioural impairments that reach the applicable 55% whole-person impairment threshold; and
- severe mental or behavioural impairment meeting the required marked or extreme impairment tests.
Some CAT criteria can be established earlier than others. Others require a particular prognosis or assessment after a specified period. This is why the question is not always simply whether an injury is severe. The evidence, the applicable CAT criterion and the timing of the application can all matter.
Catastrophic Injury vs. Catastrophic Impairment
The terms are often used interchangeably in everyday conversation, but they do not mean exactly the same thing in Ontario accident-benefit law.
A catastrophic injury is a general description of an injury that has severe or life-changing consequences. A catastrophic impairment is a defined legal classification under the SABS.
For example, a person may have a very serious brain, spinal, physical or psychological injury, but the insurer may still dispute whether the specific legal test for CAT status has been met. In other cases, a combination of impairments may satisfy a CAT criterion even though no single injury tells the whole story.
This distinction matters because CAT status can change the level of accident benefits available to support treatment, rehabilitation and care.
Why Does CAT Status Matter After a Car Accident?
Catastrophic impairment status can substantially increase the accident-benefit resources available to an injured person.
For accidents occurring on or after June 3, 2019, the standard combined limit for medical, rehabilitation and attendant care benefits is generally $65,000 for a non-catastrophic impairment and $1 million for a catastrophic impairment, subject to the applicable policy and any optional coverage.
The standard monthly attendant care limit is generally $3,000 for a non-catastrophic impairment and $6,000 for a catastrophic impairment, again subject to the applicable policy and optional benefits.
CAT status can also affect access to case management services and other benefits or supports available under the SABS, depending on the circumstances and the coverage in place.
For someone facing long-term rehabilitation, personal-care needs, home or vehicle modifications, specialized treatment or ongoing support, the difference can be significant.
Catastrophic impairment status is not the same as the value of a lawsuit or settlement against an at-fault driver. If you are looking specifically for information about compensation and settlement value, see our guide to catastrophic injury settlements in Ontario.
How Do You Apply for a Catastrophic Impairment Determination?
A person seeking a CAT determination generally applies to their automobile insurer using the OCF-19, the Application for Determination of Catastrophic Impairment.
The OCF-19 identifies the CAT criterion or criteria being relied upon and includes the medical assessment supporting the application. The assessment is generally conducted by a physician. Where the impairment is a traumatic brain impairment only, a neuropsychologist may conduct the assessment.
Once a properly prepared and signed application is received, the insurer has obligations under the SABS governing how and when it must respond. The insurer may accept CAT status, deny it with medical and other reasons, or require an insurer examination before making its determination.
The application itself can also affect attendant care benefits while CAT status is still being determined in certain circumstances.
Learn more about the OCF-19 and the catastrophic impairment application process.
HIMPRO Case Result
Raman v. TD General Insurance Company: Challenging Delay After an OCF-19
HIMPRO Managing Partner David Himelfarb represented the applicant in Raman v. TD General Insurance Company, 2026 ONLAT 24-014730/AABS. TD had received an OCF-19 but treated the application as incomplete while continuing to apply the lower non-catastrophic attendant care limit.
HIMPRO challenged TD’s position. The Licence Appeal Tribunal found that the additional information TD said was missing was not required for the OCF-19 to constitute a completed application. It also found that TD had unreasonably delayed $9,591 in enhanced attendant care benefits and had unreasonably withheld or delayed $41,670.13 in court-approved guardianship expenses it had previously agreed to fund.
The Tribunal ordered a 25% special award in relation to the delayed attendant care benefits and an 18% special award in relation to the guardianship expenses, together with applicable interest. Raman shows why CAT disputes can turn on insurer compliance and timing as well as the medical criteria.
For the full Raman case study and a detailed explanation of the OCF-19 process, see our OCF-19 guide.
What If the Insurer Denies or Delays CAT Status?
An insurer’s decision that an impairment is not catastrophic does not necessarily end the claim.
A CAT dispute may involve questions such as:
- whether the correct CAT criterion was used;
- whether the medical and functional evidence satisfies the applicable legal test;
- whether physical and mental or behavioural impairments were assessed properly;
- whether the timing and prognosis requirements were met;
- whether the insurer followed the required process after receiving the OCF-19; and
- whether benefits were paid at the proper level while the CAT determination was pending.
If the disagreement cannot be resolved, a claimant may challenge the insurer’s position before Ontario’s Licence Appeal Tribunal – Automobile Accident Benefits Service.
Serious injury claims can develop quickly, and the evidence required for a CAT determination may come from hospital records, diagnostic imaging, treating specialists, rehabilitation professionals, occupational therapists, neuropsychologists and other experts. Identifying and preserving the right evidence early can strengthen the claim and help avoid unnecessary delays.
How Can a Catastrophic Impairment Lawyer Help?
A catastrophic impairment lawyer can help build the CAT claim from the outset rather than waiting for an insurer dispute to develop.
Depending on the case, that work may include:
- identifying which CAT criteria may apply and when an application should be made;
- reviewing the medical and rehabilitation evidence supporting the claim;
- working with the appropriate medical and rehabilitation professionals;
- reviewing the OCF-19 and the insurer’s response;
- protecting access to attendant care and other accident benefits while CAT status is being determined;
- challenging improper denials, delays or underpayments;
- representing the injured person before the Licence Appeal Tribunal where necessary; and
- coordinating the accident-benefit claim with any claim against an at-fault driver so that the case is built as a whole.
At HIMPRO, we do not wait until the end of a serious injury claim to start thinking about the evidence needed to win it. We move quickly to understand the injuries, the care and rehabilitation needs, the available insurance coverage and the legal issues that can affect the result.
Our lawyers deal with the insurance company so that you and your family can focus on recovery. We build the medical, functional and legal evidence needed to maximize the benefits and compensation available to you.
At HIMPRO, we build winning cases – FAST. That’s The HIMPRO Advantage™.
Speak With a Catastrophic Impairment Lawyer
If you or a family member has suffered a serious motor vehicle injury and you have questions about catastrophic impairment, CAT benefits or an OCF-19, contact HIMPRO for a free consultation.
Timing is critical in serious injury claims. Don’t delay discussing your matter with us to find out how we can help build a winning case for you.
HIMPRO represents seriously injured clients in Toronto and across Ontario. You don’t pay us unless we win your case.
