Poisoning by 4-Aminophenol derivatives, undet, sequela

This code signifies a long-term health problem or complication resulting from an exposure to 4-aminophenol derivatives, such as acetaminophen, where the intent of the poisoning (accidental vs. intentional) cannot be determined. It indicates that the acute phase of the poisoning has passed, and the patient is now experiencing residual effects.

Use this code when documenting a chronic condition or permanent injury directly attributable to a past 4-aminophenol derivative poisoning of unknown intent. This applies to follow-up encounters where the sequelae are being managed, rather than the initial acute poisoning event. Examples include chronic liver damage or kidney dysfunction identified months or years after the original exposure.

• Always sequence this code after the code(s) for the specific sequela being treated (e.g., chronic liver failure).
• Ensure documentation clearly links the current condition to a past 4-aminophenol derivative poisoning.
• Do not use this code for acute poisoning events; instead, use the appropriate acute poisoning code with the 7th character for initial, subsequent, or sequela encounter.