Poisoning by oth narcotics, accidental (unintentional), init

This code signifies an accidental overdose or adverse reaction to a narcotic substance not otherwise specified, such as codeine, hydrocodone, or oxycodone, when the intent was unintentional. The patient is experiencing the acute effects of the poisoning during this initial encounter for treatment.

Apply this code when a patient presents to the emergency department or clinic with symptoms of poisoning due to an accidental ingestion, inhalation, or injection of an unspecified narcotic. This includes situations where the patient mistakenly took too much of their prescribed medication or ingested someone else's narcotic unintentionally.

• Always assign an additional code for the specific narcotic if known (e.g., T40.2X1A for other opioids).
• Ensure the "A" seventh character is used only for the initial encounter where the patient is receiving active treatment for the poisoning.
• Distinguish from intentional self-harm (T40.692A) or assault (T40.693A) based on documentation of intent.