These categories are used for forms of pathological dissociation that do not fully meet the criteria of the other specified dissociative disorders; or if the correct category has not been determined; or the disorder is transient.The ICD11 lists dissociative disorders as: 

Dissociative neurological symptom disorder
Dissociative amnesia
Dissociative amnesia with dissociative fugue
Trance disorder
Possession trance disorder
Dissociative identity disorder
Partial dissociative identity disorder
Depersonalization-derealization disorder

Cause and treatment
Dissociative identity disorder
Cause: Dissociative identity disorder is caused by ongoing childhood trauma that occurs before the ages of six to nine. People with dissociative identity disorder usually have close relatives who have also had similar experiences.Treatment: Long-term psychotherapy to improve the patients quality of life. Dissociative amnesia
Cause: A way to cope with trauma. Treatment: Psychotherapy (e.g. talk therapy) counseling or psychosocial therapy which involves talking about your disorder and related issues with a mental health provider. Psychotherapy often involves hypnosis (help you remember and work through the trauma); creative art therapy (using creative process to help a person who cannot express his or her thoughts); cognitive therapy (talk therapy to identify unhealthy and negative beliefs/behaviors); and medications (antidepressants, anti-anxiety medications, or sedatives). These medications help control the symptoms associated with the dissociative disorders, but there are no medications yet that specifically treat dissociative disorders. However, the medication pentothal can sometimes help to restore the memories. The length of an event of dissociative amnesia may be a few minutes or several years. If an episode is associated with a traumatic event, the amnesia may clear up when the person is removed from the traumatic situation.
Dissociative fugue was a separate category but is now listed as a specifier for dissociative amnesia. Depersonalization-derealization disorder
Cause: Dissociative disorders usually develop as a way to cope with trauma. The disorders most often form in children subjected to chronic physical, sexual or emotional abuse or, less frequently, a home environment that is otherwise frightening or highly unpredictable; however, this disorder can also acutely form due to severe traumas such as war or the death of a loved one. Treatment: Same treatment as dissociative amnesia. An episode of depersonalization-derealization disorder can be as brief as a few seconds or continue for several years.Dissociative disorders, especially dissociative identity disorder (DID), while being the result of extraordinary abuse and trauma in childhood, it should not be attributed exotic status. DID would be better examined through a more holistic lens, taking into considering the social, cognitive, and neural components, and how they interact with one another. Medications
There are no medications to treat dissociative disorders, however, drugs to treat anxiety and depression that may accompany the disorders can be given. Diagnosis and prevalence
The lifetime prevalence of dissociative disorders varies from 10% in the general population to 46% in psychiatric inpatients. Diagnosis can be made with the help of structured clinical interviews such as the Dissociative Disorders Interview Schedule (DDIS) and the Structured Clinical Interview for DSM-IV Dissociative Disorders (SCID-D-R), and behavioral observation of dissociative signs during the interview.