Your state might have a victims assistance program. You would have to check to see if the program would help cover the medical expenses.
Our daughter had a problem at her old school with a kid who was MUCH bigger than everyone else in their grade. The kid was ALWAYS in trouble. He would hit and kick other kids all of the time. The kid just could not be controlled. From what I have read about bullies he has a very sad future ahead of him. We knew him for three years and his behavior was not changing and I know the school was trying to help him. He is in third grade assuming he passed second.
Our daughter has been told if she is attacked she can defend herself. I'll deal with the school. There was alot of bullying on the playground and the teachers were missing it. I SAW it happened to my daughter one day when I came to pick her up. The teachers missed it and it happened right in front of three of them. The bullying was causing her a great deal of stress. There was conversations about not wanting to go to school. And this was at A GREAT school with GREAT teachers.
One afternoon I picked her up in her after school program. The kids were outside playing. She and her buddy who is much smaller than her were running into the building. Lagging behind was the bully. He was very RED faced. Not moving too quickly. And a bit hunched over. Out of breath a bit. Hmmmm.
Once we got her things and started driving home I asked what was going on on the playground this afternoon?
Long story short is that the bully had attacked her again. Her buddy jumped in to help out my daughter and they proceeded to whip his fanny. Even with the two of them he still out weighed them.

He pretty much left both of them alone from that point on. The bully had been attacking both of them pretty constantly up to that point. But no longer.
It sure would be nice if this stuff could be stopped. I do think the schools are doing a much better job today compared to when I was a kid. But there is still too much bullying. The bully in this story had two parents. They did not have money issues that I could tell. They were involved with the school and child. You don't know what is happening in the house of course but they did seem to be trying to stop their son's bad behaviors. But the kid was still getting in trouble.
Our daughter now rides the bus. We are fortunate in that the bus drivers is the schools PE teacher.

So the driver/teacher knows the kids and she seems to keep good order on the bus. Our school goes from K to 12. Youngest kids sit up front with the older kids towards the back.
Being a parent sure is hard with all of the problems we and the kids have to deal with.
Later,
Dan