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

This code signifies a patient presenting with adverse effects from an unknown drug, medication, or biological substance, where the exposure was intentionally inflicted by another person. The "initial encounter" designation indicates this is the first time the patient is receiving active treatment for this specific poisoning event.

Use this code when documentation clearly states poisoning by an unspecified substance, and the intent is explicitly documented as an assault. This is appropriate for emergency department visits or initial hospital admissions for such an event, prior to definitive identification of the specific substance involved.

• Ensure the documentation explicitly states "assault" as the intent; otherwise, consider accidental or undetermined intent codes.
• Only use this code for the initial encounter for treatment of the poisoning; subsequent care would use the appropriate "subsequent encounter" code.
• Avoid using this code if a more specific drug, medication, or biological substance is identified; always code to the highest level of specificity.