 The criteria for diagnosing paranoid schizophrenia must be present from at least one to six months.This helps to differentiate schizophrenia from other mental disorders, such as bipolar disorder.In the United States, paranoid schizophrenia is defined in the "Diagnostic and Statistical Manual of Mental Disorders" (DSM), 4th Edition, but was dropped from the 5th Edition in 2013, along with the other four subtypes of schizophrenia (disorganized, catatonic, undifferentiated, and residual).