Poisoning by fentanyl or fentanyl analogs, acc, sequela

This code signifies the long-term effects or complications arising from an accidental overdose or exposure to fentanyl or its analogs. It indicates that the acute poisoning event has resolved, but the patient is now experiencing residual health problems directly attributable to that unintentional poisoning.

Apply this code when documenting conditions such as chronic organ damage (e.g., anoxic brain injury, kidney failure) or persistent neurological deficits that are a direct consequence of a past accidental fentanyl poisoning. This code is appropriate for follow-up encounters where the sequelae are being managed, not the acute poisoning itself.

• Always sequence this code after the code for the specific sequela being treated (e.g., G93.1 for anoxic brain damage).
• Ensure documentation clearly links the current condition to a past accidental fentanyl poisoning.
• Do not use this code for the acute poisoning event; use the appropriate acute poisoning code (T40.411A or T40.411D) for that.