Poisoning by tetracyclic antidepressants, undetermined, init

This code signifies a patient presenting with adverse effects from tetracyclic antidepressants, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined at the time of the initial encounter. The patient is experiencing symptoms directly attributable to the drug's toxic effects.

Apply this code when a patient is admitted or seen for the first time due to an overdose or adverse reaction to a tetracyclic antidepressant, and the medical record does not clearly state whether the poisoning was accidental, intentional, or due to assault. This is appropriate for initial evaluations in the emergency department or inpatient setting.

• Always sequence this code first, followed by codes for any associated signs and symptoms or specific organ damage.
• Do not use this code if the intent of the poisoning is known; instead, select the appropriate intent (accidental, intentional self-harm, assault).
• Remember the "A" suffix indicates an initial encounter; subsequent encounters for the same poisoning would require a different seventh character.