The 11th Revision of the International Classification of Diseases (ICD-11) publication was released in 2018. ICD-11 lists Hoarding Disorder under the category of Obsessive-compulsive or related disorders alongside other anxiety disorders, all of which sits inside the Mental, behavioural or neurodevelopmental disorders category.

The is how Hoarding Disorder is listed under – Obsessive-compulsive or related disorders (F42), a category which includes:

With regard to the essential features of the ICD-11 manual it states the following diagnostic criteria for Hoarding Disorder (6B24):

Hoarding disorder is characterised by accumulation of possessions due to excessive acquisition of or difficulty discarding possessions, regardless of their actual value. Excessive acquisition is characterised by repetitive urges or behaviours related to amassing or buying items. Difficulty discarding possessions is characterised by a perceived need to save items and distress associated with discarding them. Accumulation of possessions results in living spaces becoming cluttered to the point that their use or safety is compromised. The symptoms result in significant distress or significant impairment in personal, family, social, educational, occupational or other important areas of functioning.

Hoarding disorder with fair to good insight Hoarding Disorder (6B24.0):
All definition requirements of hoarding disorder are met. Much of the time, the individual is able to entertain the possibility that his or her disorder-specific beliefs may not be true and is willing to accept an alternative explanation for his or her experience. At circumscribed times (e.g., when highly anxious), the individual may demonstrate no insight.

Hoarding disorder with poor to absent insight (6B24.1)
All definition requirements of hoarding disorder are met. Most or all of the time, the individual is convinced that the disorder-specific beliefs are true and cannot accept an alternative explanation for their experience. The lack of insight exhibited by the individual does not vary markedly as a function of anxiety level.

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