what does NOS mean in medical terms
Making the world better, one answer at a time. Most commonly, NOS means not otherwise specified. In other words if you've been diagnosed as having anxiety order nos...it means that you don't have a specific anxiety disorder, just a more general one.Another example: If your knee hurts and you go to the ER, but they can't find the cause.I don't know if that's a real example without looking at the coding manual, but it gives a flavor for how the abbreviation is used.). Not Otherwise Specified. It is a way to say that a particular patient has signs and symptoms that just doesn't fit nicely into the criteria set in the DSM.