Poisoning by methadone, assault, subsequent encounter

This code signifies a poisoning event caused by methadone, where the substance was administered with malicious intent by another party. It specifically applies to encounters following the initial treatment of the poisoning, such as follow-up appointments, medication adjustments, or management of ongoing complications.

Use this code for subsequent encounters when a patient is receiving ongoing care for methadone poisoning that was inflicted as an assault. This includes situations where the patient is being monitored for long-term effects, undergoing rehabilitation, or receiving treatment for psychological trauma related to the assault.

• Ensure documentation clearly states the poisoning was due to methadone and was an assault.
• This "D" seventh character indicates a subsequent encounter; do not use for the initial treatment of the poisoning.
• Always sequence this code as a secondary diagnosis, with the primary diagnosis reflecting the specific sequelae or reason for the current encounter.