Poisoning by antiallergic and antiemetic drugs

This code signifies an adverse health effect resulting from the ingestion, exposure, or administration of antiallergic (e.g., antihistamines) or antiemetic (e.g., anti-nausea) medications, where the substance acts as a poison. This typically involves an overdose, accidental ingestion, or intentional self-harm leading to toxic effects.

Apply this code when documentation clearly indicates a patient presenting with symptoms of poisoning due to an antiallergic or antiemetic drug. This includes cases of accidental overdose, therapeutic misadventure, or intentional overdose. Supporting documentation should detail the specific drug class involved and the resulting toxic effects.

• Always sequence this poisoning code first, followed by codes for the specific manifestations of the poisoning.
• Distinguish carefully between poisoning (adverse effect due to overdose/toxicity) and adverse effect in therapeutic use (e.g., side effect at normal dosage).
• Ensure the medical record specifies the drug class (antiallergic or antiemetic) to justify this specific poisoning code.