As Good As It Gets: A Review In As Good As It Gets, the main character Melvin Eudoll (played by Jack Nicholson) definitely suffers from obsessive compulsive disorder DMS code 300.30. He also may very well be suffering from oppositional defiant disorder, DSM code 313.81. On a scale of one to ten, I would surely give a ten to his having obsessive compulsive disorder. As far as the possible presence of oppositional defiant disorder, I would rate my confidence with openly a five being that it is mainly considered to be a childhood disorder, and that I am exceedingly undereducated and inexperienced regarding diagnosis of mental disorders. Obse