Poisoning by unsp drug/meds/biol subst, assault, subs

This code signifies a patient presenting for follow-up care related to an intentional overdose or poisoning by an unknown or unspecified drug, medication, or biological substance. The poisoning was inflicted by another person with intent to harm.

Apply this code when documenting a subsequent visit for monitoring, treatment of lingering effects, or rehabilitation following an assault by an unspecified toxic substance. This includes scenarios like follow-up appointments after initial stabilization in the emergency department or inpatient setting.

• Ensure the documentation clearly states the poisoning was an assault and that this is not the initial encounter for the poisoning event.
• Always sequence this code after the primary diagnosis for the specific effects of the poisoning, if known.
• If the specific drug or substance is identified during the subsequent encounter, a more specific poisoning code should be used instead.