Poisoning by hydantoin derivatives, assault, sequela

This code signifies a long-term health problem or complication resulting from an intentional overdose or exposure to hydantoin derivatives, such as phenytoin, administered with malicious intent. The patient is experiencing persistent effects directly attributable to this past poisoning event.

Apply this code when documenting a patient presenting with chronic or residual conditions (e.g., neurological damage, organ dysfunction) that are a direct consequence of a previously sustained hydantoin poisoning that was determined to be an assault. This code is used for encounters where the sequela, not the acute poisoning, is being treated.

• Always sequence this code after the code for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a past hydantoin poisoning by assault.
• Do not use this code for acute poisoning events; use the appropriate acute poisoning code with the assault external cause code.