Without knowing additional facts, I can't tell you an actual dollar value for the case. Factors to consider include the total cost of the medical bills, whether the person had any pre-existing injuries, whether the person was previously in any accidents, whether there was any shared fault between the drivers, etc.
What I can tell you is that, if there aren't liability issues or previous accidents, you should PROBABLY be able to do better than 1.5 times the medical bills. That being said, I CANNOT tell you whether it is worth pursuing court action in this case until I know more facts.
I would suggest talking to a personal injury attorney about the facts of the case. I would be happy to answer any further questions that you have if you'd like to contact me.