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Outpatient coder

I would use V71.89 Observation for other specified conditions
If the doctor has not documented any adverse effects of the pt than it would code to the observation
 
All V71 codes are for conditions not found. If it is known that a non medicinal substance was ingested then you use the code for that substance. Also there is no E98.09 diagnosis code, perhaps you meant E980.9. I would query for a specific substance before resorting to unspecified. You also need to know what the effect to the patient was.
 
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