Poisoning by antitussives, undetermined, initial encounter

This code signifies a case of poisoning due to an antitussive medication where the intent (accidental, intentional self-harm, assault) cannot be determined. The patient is in the initial phase of receiving active treatment for the toxic effects of the antitussive.

Apply this code when a patient presents with symptoms of antitussive overdose, and the medical record explicitly states that the intent of the poisoning is unknown or undetermined. This is appropriate for the first encounter where the poisoning is being evaluated and treated.

• Ensure documentation clearly states "undetermined" intent for antitussive poisoning.
• Pair with external cause codes (e.g., Y11.X) to provide more specific details about the circumstances, if available.
• Use a subsequent encounter code (e.g., T48.3X4D) for follow-up care after the initial treatment.