Poisoning by phenothiazine-based tranquilizers

This code signifies an adverse reaction or overdose resulting from the ingestion or exposure to phenothiazine-based tranquilizers. It describes the toxic effects experienced by a patient due to these specific psychotropic medications.

This code is appropriate when documentation clearly indicates a patient's signs and symptoms are directly attributable to poisoning by a phenothiazine derivative. This includes accidental overdoses, intentional self-harm, or adverse drug reactions manifesting as toxic effects.

• Always sequence this code first when it represents the primary reason for the encounter.
• Ensure the documentation specifies a phenothiazine-based tranquilizer; do not use for other classes of tranquilizers.
• Look for associated signs and symptoms of poisoning (e.g., extrapyramidal symptoms, hypotension, sedation) to support the diagnosis.