I am afraid that will never happen
1 patient and 6 psychiatrist equals 6 different diagnoses/classifications
the diagnosis is often a reflection of the person behind the psychiatrist itself, his own life experiences, his age, his own life events, social background, skills, his own world, culture, values, religion etc.
remember it is all about the interpretation of the presented symptoms and the interaction between patient and psychiatrist, the duration of their contact with eachother, so many variables so many classifications. Therefore they call them classifications and not diagnoses