Delusion is not present in -
Delusions are seen in psychosis (Schizophrenia, Mania, depression, other psychotic disorder-delusional disorders and Schizoaffective disorders) and organic mental disorders (Delirium, substance abuse or withdrawal).
Delusions are not seen in neurosis:- Anxiety, obsessive-compulsive disorder, Dissociative (conversion) disorders, somatoform disorders, stress-related disorders.
Delirium
Mania
Depression
Compulsive disorder