To be considered, several symptoms must have appeared by the age of six to twelve and occur in more than one environment (e.g. at home and at school or work). The symptoms must be inappropriate for a child of that age and there must be clear evidence that they are causing social, school or work related problems.The DSM-5 and the DSM-5-TR also provide two diagnoses for individuals who have symptoms of ADHD but do not entirely meet the requirements. Other Specified ADHD allows the clinician to describe why the individual does not meet the criteria, whereas Unspecified ADHD is used where the clinician chooses not to describe the reason. International Classification of Diseases
In the eleventh revision of the International Statistical Classification of Diseases and Related Health Problems (ICD-11) by the World Health Organization, the disorder is classified as Attention deficit hyperactivity disorder (with the code 6A05). The defined subtypes are similar to those of the DSM-5: predominantly inattentive presentation (6A05.0); predominantly hyperactive-impulsive presentation(6A05.1); combined presentation (6A05.2). However, the ICD-11 includes two residual categories for individuals who do not entirely match any of the defined subtypes: other specified presentation (6A05.Y) where the clinician includes detail on the individuals presentation; and presentation unspecified (6A05.Z) where the clinician does not provide detail.In the tenth revision (ICD-10), the symptoms of hyperkinetic disorder were analogous to ADHD in the ICD-11. When a conduct disorder  (as defined by ICD-10) is present, the condition was referred to as hyperkinetic conduct disorder.
National Institutes of Health (NIH), U.S. Department of Health and Human Services. Archived 4 November 2021 at the Wayback Machine
New Zealand Ministry of Health Guidelines for the Assessment and Treatment of Attention-Deficit/Hyperactivity Disorder. 2 July 2001. Archived 27 October 2014 at the Wayback Machine
"Women and girls with ADHD" (video). (17 April 2020), with Stephen P. Hinshaw and others, Knowable Magazine Attention deficit hyperactivity disorder at the Internet Archive.