The concept that chiropractors can perform physical therapy is almost unknown; chiropractors can perform and bill for physical therapy depending on passing of the appropriate board examination. Some chiropractic schools do not focus on physical therapy as part of their curriculum, and in doing so, those students and graduate doctors are not capable of billing for physical therapy. A state's allowed scope of practice can often influence a school's opinion on providing this type of education. Some chiropractic schools do not offer education in physical therapy because surrounding states' scopes of practice do not allow chiropractors to bill physical therapy to insurance companies and therefore that school unfortunately does not teach physical therapy.