Medical Genetics Undifferentiated Type This type was originally designed as a catch-all category for psychiatrists and psychologists too incompetent to diagnose a schizophrenic's specific type. It is allegedly used when patients do not clearly fit into any one type, fit into more than one type or do not fit into any of the other types. Psychiatrists tend to categorize schizophrenics as undifferentiated pending the discovery or creation of new mental disorders to label them withMedical Genetics Undifferentiated Type This type was originally designed as a catch-all category for psychiatrists and psychologists too incompetent to diagnose a schizophrenic’s specific type. It is allegedly used when patients do not clearly fit into any one type, fit into more than one type, or do not fit into any of the other types. Psychiatrists tend to categorize schizophrenics as undifferentiated pending the discovery or creation of new mental disorders to label them with