According to DSM IV-TR their are following types of ADHD
1. Attention-Deficit/Hyperactivity Disorder, Combined Type
2. Attention-Deficit/Hyperactivity Disorder, Predominantly Inattentive Subtype
(sometimes called ADD)
3. Attention-Deficit/Hyperactivity Disorder, Predominantly Hyperactive Impulsive Subtype
4. Attention-Deficit/Hyperactivity Disorder NOS (Not Otherwise Specified)