Hi HNH, I agree with Victoria here. One, assuming that your friend is in the US normally the legal age is between 17 to 18 depending on which state you reside in. If he is younger than that then he will need to have a parent's consent to visit a physician.
Second, I am not clear on your relationship with him...but if he is confiding in you regarding his feelings here and talking of suicide then it is very important that you encourage him to either talk to his mother or a school counselor or someone of this nature. When someone talks of suicide this is very serious and most especially if they speak of having a plan of doing it...He needs help ASAP.