If you are a passenger in a car and are hurt in a car accident, your legal case is usually easier than for either driver. This is because you do not have to prove liability to be compensated for your injuries. One or both of the drivers was at fault, and you will be compensated by one of their insurance policies, or possibly both.
If the car accident involved two vehicles, one of the drivers will be liable. It is almost impossible for a two-car accident to not have at least one driver held liable.
If the accident only involved one vehicle, then the driver usually is held liable. Generally, if the single driver struck something while driving, such as a tree, they usually did or did not do something that was negligent. But occasionally there are exceptions. It is possible for a deer to run into the road and the car to hit it, resulting in your injuries.
A passenger injury claim usually proceeds like any auto accident claim. The only exception is if two drivers are involved. In this case, you would make a claim against both drivers. You would want to get the insurance information for both drivers and file claims with each insurance company. There are exceptions: If it is obvious one of the drivers was not negligent, such as in a clear cut, rear end accident, it would generally not be necessary to file a claim against the driver of the car in front.
If the accident happened in a no-fault state, you would file a personal injury protection or no fault claim against that driver.
After you have finished your medical treatments, you will then need to work with the insurance companies involved to settle the claim. Or you can have your attorney do it for you.