ICD-10-CM > F01-F99 > F20-F29 > F20 > F20.3 F20.3 Undifferentiated schizophrenia Billable/Specific Copy Code Copy Description Applicable To Atypical schizophrenia Type 1 Excludes acute schizophrenia-like psychotic disorder (F23) Type 2 Excludes post-schizophrenic depression (F32.89)