Poisoning by tetracyclic antidepressants, self-harm, init

This code signifies a patient presenting with adverse effects from an overdose of tetracyclic antidepressants, where the intent was to harm oneself. The "initial encounter" indicates that the patient is receiving active treatment for the poisoning. This diagnosis reflects a serious medical emergency requiring immediate intervention.

Apply this code when a patient is admitted to the emergency department or hospital due to an intentional overdose of a tetracyclic antidepressant. This includes scenarios where the patient explicitly states self-harm intent or when the circumstances strongly suggest it (e.g., suicide note, history of attempts). It is appropriate for the initial phase of treatment, such as gastric lavage, administration of antidotes, or close monitoring in an acute care setting.

• Always code the specific substance involved if known; "tetracyclic antidepressants" is a class.
• Ensure documentation clearly supports "intentional self-harm" versus accidental or assault.
• Verify the encounter type; "initial encounter" is for active treatment, not follow-up care.