Poisoning by methadone, undetermined, initial encounter

This diagnosis code indicates a case of poisoning specifically due to methadone, where the intent (e.g., accidental, intentional self-harm, assault) cannot be determined from the available documentation. It signifies the initial phase of treatment for the acute poisoning event.

This code is appropriate for patients presenting with signs and symptoms of methadone toxicity, such as respiratory depression, pinpoint pupils, or altered mental status, when the provider's documentation clearly states methadone as the causative agent and the intent is unknown. It should be used for the first encounter related to this specific poisoning episode.

• Ensure documentation explicitly states "undetermined" intent for methadone poisoning.
• Verify that methadone is the sole or primary opioid implicated in the poisoning for this specific code.
• Append additional codes for any associated manifestations of the poisoning or other relevant conditions.