It is perhaps not "right" in the sense of moral or fair, but it is legal: the other side and their attorney can offer--or refuse to offer--anything they want. There is no obligation on them to pay until and unless you sue in court and win, getting a judgment requiring payment. You, on the other hand, have the legal right to tell that is no acceptable and to sue (or if you have already filed suit, to continue with the case and go to trial for the full amount, including medical, you believe you are owed), rather than accept what they are offering.