Do you want the doctor to bill the patient's health insurance for charges already paid for by the PIP benefits - so the doctor gets paid twice?
Do you want the doctor to bill the patient's health insurance for charges that will / might be paid under the LOP (Letters of Protection?) settlement - so the doctor gets paid twice?
If that is not what you want, how can you know what to bill the health insurance for, before the LOP settlement is made? Serious question, as I can't really tell what you are thinking from the information you provided.