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

This code signifies a long-term consequence or complication resulting from an intentional act of poisoning by an unknown or unspecified drug, medication, or biological substance. It indicates that the acute phase of the poisoning has passed, and the patient is now experiencing residual effects directly attributable to that assault.

Apply this code when documenting a chronic condition, disability, or other lasting health problem that is a direct result of a past poisoning by an unspecified substance, where the poisoning was inflicted with malicious intent. This is appropriate for follow-up encounters after the initial treatment of the acute poisoning event.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., chronic kidney disease, neurological damage).
• Ensure documentation clearly links the current condition to a past assaultive poisoning by an unspecified substance.
• Avoid using this code for acute poisoning events; those require codes from the initial encounter or subsequent encounter categories.