Poisn by unsp prim sys and hematolog agent, assault, init

This code signifies a patient presenting with adverse effects from an unknown systemic or blood-affecting substance, where the exposure was intentionally inflicted by another person. The "initial encounter" indicates the patient is receiving active treatment for the acute effects of this poisoning.

Apply this code when documentation clearly states poisoning by an unspecified drug or chemical primarily affecting the body's systems or blood, and the intent is explicitly documented as an assault. This is appropriate for the first visit where the patient is being evaluated and treated for the immediate consequences of the poisoning.

• Ensure documentation explicitly states "assault" as the intent. If intent is unknown, a different intent code (e.g., accidental, undetermined) should be used.
• Only use "unspecified" when the specific substance is not identified in the medical record.
• "Initial encounter" applies as long as the patient is receiving active treatment for the poisoning, even if seen multiple times for the same event.