Toxic effect of unsp noxious sub eaten as food, undet, sqla

This code describes the long-term or residual effects resulting from a poisoning event caused by an unknown harmful substance ingested as food. The original poisoning itself is no longer active, but the patient continues to experience health problems directly attributable to that past exposure. The intent of the poisoning (accidental, intentional, etc.) could not be determined.

Use this code when documenting a patient presenting with chronic health issues, such as organ damage, neurological deficits, or persistent gastrointestinal problems, that are definitively linked to a past ingestion of an unidentified toxic food substance. This code is appropriate when the acute phase of the poisoning has resolved, and the current encounter is for managing these lasting complications.

• Requires a seventh character of 'S' for sequela, indicating a late effect.
• Only assign this code when the specific toxic substance is unknown and the intent is undetermined.
• Always sequence this code after the code(s) for the specific sequela being treated (e.g., chronic kidney disease, peripheral neuropathy).