The Diagnostic and Statistical Manual 4th Edition lists Eating Disorders Not Otherwise Specified (EDNOS) as a separate category that does not meet the specific criteria for anorexia nervosa and bulimia nervosa.

When people exhibit behaviors in the spectrum of disordered eating but do not meet all the criteria for Anorexia Nervosa or Bulimia, they are given a diagnosis of Eating Disorder Not Otherwise Specified (EDNOS). Over one-half to two-thirds of people diagnosed with an eating disorder fall into the category of EDNOS.

More people are diagnosed with EDNOS than Anorexia Nervosa and Bulimia Nervosa combined. Currently Binge Eating Disorder falls under this category, but as of 2013 will have its own category.