Poisoning by multiple unsp drug/meds/biol subst, undet, init

This code signifies a patient presenting with an adverse effect from the ingestion or exposure to multiple unknown substances, where the intent (e.g., accidental, intentional self-harm) cannot be determined. The patient is experiencing the acute effects of this poisoning at the time of the encounter.

This code is appropriate for initial encounters when a patient arrives with symptoms of poisoning due to several unidentified drugs, medications, or biological substances. It is used when the clinician cannot ascertain the specific substances involved or the circumstances surrounding the exposure.

• Always sequence this code first for the poisoning event, followed by codes for any associated manifestations.
• Avoid using this code if any specific substance is identified, even if others remain unknown; instead, use codes for known substances.
• Ensure documentation clearly states "multiple unspecified" and "undetermined intent" to support the use of this code.