Poisoning by smallpox vaccines, undetermined, init encntr

This code signifies an adverse reaction or toxic effect resulting from the administration of a smallpox vaccine, where the intent (e.g., accidental, intentional self-harm) cannot be determined. It indicates the initial phase of treatment for such a poisoning event.

Apply this code when a patient presents with symptoms of poisoning directly attributable to a smallpox vaccine, and the medical documentation does not specify whether the poisoning was accidental, intentional, or due to assault. This code is appropriate for the initial encounter for this specific condition.

• Always assign an additional code for the specific manifestation(s) of the poisoning.
• Ensure documentation clearly links the adverse effect to a smallpox vaccine.
• Only use the "A" seventh character for the initial encounter; subsequent care would use "D" or "S".