Poisoning by methadone, undetermined, subsequent encounter

This code indicates a patient presenting for follow-up care or sequelae related to a methadone poisoning where the intent (accidental, intentional self-harm, assault) could not be determined. The poisoning event itself occurred previously, and the current encounter addresses ongoing effects or management.

Use this code for subsequent encounters when a patient is being treated for complications, withdrawal symptoms, or monitoring after an initial methadone overdose or toxic exposure of undetermined intent. This applies to situations like follow-up appointments, rehabilitation, or ongoing medical management after discharge from acute care.

• Ensure the documentation clearly states the encounter is for follow-up or sequelae of the poisoning, not the initial acute event.
• Confirm the intent of the methadone poisoning was explicitly documented as "undetermined" by the provider.
• Always sequence this code after any codes for the specific manifestations or complications of the poisoning.