 In North America , DSM @-@ 5 criteria are used for diagnosis , while European countries usually use the ICD @-@ 10 . With the DSM @-@ IV criteria a diagnosis of ADHD is 3 – 4 times more likely than with the ICD @-@ 10 criteria . It is classified as neurodevelopmental psychiatric disorder . Additionally , it is classified as a disruptive behavior disorder along with oppositional defiant disorder , conduct disorder , and antisocial personality disorder . A diagnosis does not imply a neurological disorder . 
