Excerpt from About.com: (click for entire article)
Oppositional Defiant Disorder (ODD) is one of two pediatric behavioral disorders defined by the Diagnostic and Statistical Manual IV (DSM IV) that are included in the IDEA definition of "Behavioral Disturbances." While not as serious as a Conduct Disorder, which tends to include aggression and property destruction, ODD as a behavioral disorder, still compromises a student's ability to succeed academically and develop meaningful relationships with peers and teachers.
Students diagnosed with ODD may be found in general education settings if it is determined that the disorder does not prevent him or her from participating fully in the general education classroom. It is also possible that students with ODD in programs for Emotional Disturbances can manage their own behavior to the point where they can successfully be integrated into general education classrooms.