Poisoning by antiallerg/antiemetic, undetermined, subs

This code signifies a patient presenting with adverse effects or toxicity from antiallergic or antiemetic medications, where the intent of the poisoning (e.g., accidental, intentional self-harm, assault) cannot be determined. This particular code is used when the patient is receiving active treatment for the poisoning after the initial encounter.

Apply this code when a patient is admitted or seen for follow-up care related to an undetermined poisoning by antihistamines, anti-nausea drugs, or similar medications. This would include situations where the patient is undergoing detoxification, monitoring for lingering effects, or managing complications arising from the initial toxic exposure.

• Always assign an additional code for the specific antiallergic or antiemetic drug involved, if known.
• Ensure documentation clearly supports "undetermined" intent and that the encounter is subsequent to the initial poisoning event.
• Do not use this code for adverse effects of correctly prescribed and administered drugs; refer to the T36-T50 series for those scenarios.