in the DSM-IV-TR, designating a widely-based diagnostic classificaton, for instance, depressive disorder not otherwise ascertained. The NOS diagnosis is selected whenever the client's troubles seem to lie in a specific group of illnesses or dysfunctions, but the syndrome isn't common or there isn't enough data available at the time of diagnosis to ascertain a more correct the form of disorder which exists.

NOT OTHERWISE SPECIFIED (NOS): "Many syndromes and disorders are initially classified as being not otherwise specified- some move onto classifications of needing further research, and eventually end up classified as an official disorder."
Cite this page: N., Sam M.S., "NOT OTHERWISE SPECIFIED (NOS)," in, April 7, 2013, (accessed October 22, 2021).