Poisn by butyrophen/thiothixen neuroleptc, undet, sequela

This code signifies a long-term or residual effect resulting from an unconfirmed or unknown cause of poisoning by butyrophenone or thiothixene neuroleptics. These are antipsychotic medications, and the sequela indicates a lasting health problem directly attributable to the past poisoning event. The "undetermined" nature means the intent (accidental, intentional self-harm, assault) of the poisoning could not be established.

Apply this code when documenting a patient presenting with a chronic condition or permanent injury that is a direct consequence of a past poisoning by butyrophenone or thiothixene neuroleptics, and the circumstances surrounding the original poisoning event remain unclear. This is appropriate for follow-up encounters where the acute poisoning is no longer active, but its lasting impact is being treated.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., Parkinsonism, tardive dyskinesia).
• Ensure documentation clearly links the current condition to the past neuroleptic poisoning and specifies the undetermined intent.
• Do not use this code for acute poisoning events; use the appropriate acute poisoning code with the 7th character "A" or "D".