Nonpublic School (NPS) is a designation by the state of California in a private, nonsectarian school that is certified by the state to provide special education services to students based on their Individualized Education Plan (IEP). These schools provide an environment, that provides treatment for students who are struggling academically, behaviorally and socially. Many of the treatment programs listed on this website under Teens have this designation. Some states (e.g., CA http://www.cde.ca.gov/sp/se/ds/osplacmntrpt.asp) also require explicit academic standards, if not CA licensed.
Many states have lists of treatment facilities in state and out of state that are approved as temporary alternatives for the state-required (“typical”) adolescent educational track, though each state may call the “lists” something different. The path to a family placing their child in a treatment facility out of state can be arduous.