Is money taken as compensation for a car accident that resulted in fractures and material losses, based on a forensic medical report that increased the percentage of damage, permissible or impermissible (halal or haram)?

The physician is not permitted to rule with more than the patient deserves, nor is the patient permitted to accept that. Rather, he must return the excess to its owner. This action by the physician is a betrayal of trust. If the spine is broken and its breakage leads to the loss of the ability to walk or engage in sexual intercourse, then a full blood money (Diyah) is due for it. If both walking and sexual intercourse are impaired, then two blood monies are due.