According to www.dsm5.org/ Hoarding now has a disorder category.

Hoarding Disorder
“Hoarding disorder is characterized by the persistent difficulty discarding or parting with possessions, regardless of the value others may attribute to these possessions. The behavior usually has harmful effects—emotional, physical, social, financial, and even legal—for the person suffering from the disorder and family members. For individuals who hoard, the quantity of their collected items sets them apart from people with normal collecting behaviors. They accumulate a large number of possessions that often fill up or clutter active living areas of the home or workplace to the extent that their intended use is no longer possible.”

For more information click here: Obsessive Compulsive Disorders Fact Sheet(2)