Poisoning by other synthetic narcotics, accidental, init

This code signifies an adverse health event resulting from the unintentional ingestion or exposure to a synthetic narcotic other than fentanyl or tramadol. It indicates that the patient experienced a toxic effect due to an accidental overdose or misadministration of such a substance.

Apply this code when documenting cases of accidental poisoning by synthetic opioids not specifically classified elsewhere, such as propoxyphene or meperidine. This is appropriate for the initial encounter when the patient is receiving active treatment for the poisoning.

• Always assign an additional code for the specific synthetic narcotic if known (e.g., from the T40.4X- category).
• Ensure the "A" seventh character is used only for the initial encounter for active treatment of the poisoning.
• Distinguish carefully between accidental poisoning (T40.491-) and intentional self-harm (T40.492-) or assault (T40.493-).