The classic title for his condition would be ‘schizophrenia’, and under the classification of DSM, this would fall under Axis I. his state of psychosis, in which he imagines people and events, classifies episodes of delusions and hallucinations. Despite being overly intelligent, his ideation could not grasp the known physical reality as such, and was forced to view things in a different way. Thus, going onto Axis II, he may be classified as having a personality disorder, owing to his maladaptive social relations, and lack of interests therein. Theoretically speaking, and basing on the information provided in the movie, there doesn’t seem t be a medical condition with him that requires treatment as such. Hence, he may not be technically labeled on Axis III. Although the prolonged psychiatric treatment did affect his functioning, especially with respect to relations to his wife, but these cannot be termed as the primary factor.