Q: "How do I code for 'rule out' diagnoses?"
Provisional - when there is a strong presumption that the full criteria will ultimately be met for a disorder, but not enough information is available to make a firm diagnosis.
Not otherwise specified (NOS) - when there is insufficient opportunity for complete data collection but there is enough information to place the disorder within a particular diagnostic class
Unspecified Mental Disorder-non psychotic ( 300.9 ) - this is appropriate when there is enough information available to rule out a psychotic disorder but further specification is not possible
Diagnosis deferred ( 799.9 ) - if their information is inadequate to make any diagnostic judgment