Yes, in most cases, car insurance will cover physical treatment for injuries sustained as a passenger in a car accident. As a passenger, you would be covered under the Accident Benefits portion of the policy, whether the car you were in was at fault or not. The Accident Benefits coverage is mandatory in Ontario, and provides benefits for medical and rehabilitation expenses, as well as income replacement, in the event of an accident.
It's important to note that the driver of the car you were in may not be the owner of the car, so it's best to check with the insurance company of the car you were in to confirm coverage.
If the driver of the car you were in is at fault, their insurance company will be responsible for covering your medical expenses. If the driver is not at fault, the insurance company of the car that caused the accident will be responsible for covering your expenses.
Keep in mind that you may have to provide documentation such as a police report, medical bills, and proof of your relationship with the driver of the car you were in. It's also important to contact the insurance company as soon as possible to report the accident and to provide any necessary documentation.
It's always best to check with the insurance company and read your policy to understand the specific details of your coverage, and to contact them for clarification if needed.