Poisoning by unspecified narcotics, undetermined, sequela

This code describes the long-term effects or complications arising from a past poisoning event involving an unspecified narcotic, where the intent (accidental, intentional self-harm, assault) cannot be determined. It signifies that the acute phase of the poisoning has resolved, but the patient continues to experience residual health problems directly attributable to that exposure.

Apply this code when documenting a patient presenting with chronic conditions, organ damage, or other persistent health issues that are a direct consequence of a previous, unclarified poisoning by an unknown narcotic substance. This is appropriate for follow-up encounters after the initial poisoning has been treated, and the causal link to the prior narcotic exposure is established but the intent remains unknown.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a past narcotic poisoning of undetermined intent.
• Avoid using this code for acute poisoning events; instead, use the appropriate acute poisoning code with the 7th character 'A' or 'D'.