Scombroid fish poisoning, accidental, sequela

This code signifies the long-term or residual effects resulting from an accidental scombroid fish poisoning. Scombroid poisoning occurs when consuming fish that has been improperly stored, leading to the breakdown of histidine into histamine, causing an allergic-like reaction. The "sequela" aspect indicates that the acute poisoning event has passed, and the patient is now experiencing persistent health issues directly attributable to that past exposure.

Use this code when documenting conditions such as chronic urticaria, persistent gastrointestinal issues, or neurological deficits that are definitively linked as a lasting consequence of a previously diagnosed scombroid fish poisoning. This applies when the patient is no longer in the acute phase of the poisoning but is being treated for its ongoing complications. Ensure the medical record clearly establishes the causal link between the past poisoning and the current sequelae.

• Requires a seventh character "S" to indicate sequela, meaning the residual effect of a past injury or illness.
• Always sequence this code after the code(s) for the specific sequela being treated (e.g., chronic urticaria).
• Documentation must clearly state that the current condition is a direct result of a previous scombroid fish poisoning.