International Statistical Classification of Diseases and Related Health Problems
The "International Statistical Classification of Diseases and Related Health Problems", 10th Edition (ICD-10), of the World Health Organization (WHO), lists narcissistic personality disorder (NPD) under the category of "Other specific personality disorders". The ICD-10 requires that any personality-disorder diagnosis also meet and satisfy the General diagnostic criteria 2 used for determining that a person has a diagnosable personality disorder.