Poisoning by methadone, undetermined, sequela

This code indicates a long-term consequence or residual effect stemming from a methadone poisoning where the intent (accidental, intentional self-harm, assault) could not be determined. It signifies that the acute poisoning event has resolved, but the patient continues to experience related health issues.

Apply this code when documenting a chronic condition or permanent injury directly attributable to a past methadone poisoning of unknown intent. This is appropriate for follow-up encounters addressing sequelae such as organ damage, neurological deficits, or chronic pain syndromes resulting from the initial poisoning.

• Always sequence this code after the code(s) for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a past methadone poisoning.
• Do not use for acute poisoning events; this code is exclusively for residual effects.