Narcissistic Personality Disorder

Narcissistic Personality Disorder (NPD) is a personality disorder defined by the Diagnostic and Statistical Manual of Mental Disorders, the diagnostic classification system used in the United States, as "a pervasive pattern of grandiosity, need for admiration, and a lack of empathy."

The narcissist is described as turning inward for gratification rather than depending on others and as being excessively preoccupied with issues of personal adequacy, power and prestige.

DSM-IV divides personality disorders into three clusters based on symptom similarities. This clustering categorizes the Narcissistic personality disorder as a cluster B personality disorder, those personality disorders having in common an excessive sense of self importance. Also in that cluster are the Borderline personality disorder, the Histrionic personality disorder and the Antisocial personality disorder.

The ICD-10 (International Classification of Mental and Behavioural Disorders, published by the World Health Organisation in Geneva 1992) regards narcissistic personality disorder (NPD) as "a personality disorder that fits none of the specific rubrics". It relegates it to the category known as "Other specific personality disorders", which also includes the eccentric, "haltlose", immature, passive-aggressive, and psychoneurotic personality disorders.

DSM Criteria
A pervasive pattern of grandiosity (in fantasy or behavior), need for admiration, and lack of empathy, beginning by early adulthood and present in a variety of contexts, as indicated by five (or more) of the following:
...has a grandiose sense of self-importance
...is preoccupied with fantasies of unlimited success, power, brilliance, beauty, or ideal love
...believes that he or she is "special" and unique
...requires excessive admiration
...has a sense of entitlement
...is interpersonally exploitative
...lacks empathy
...is often envious of others or believes others are envious of him or her
...shows arrogant, haughty behaviors or attitudes