Scombroid fish poisoning, assault, initial encounter

This code signifies an initial encounter for a patient experiencing scombroid fish poisoning that was intentionally inflicted by another party. Scombroid poisoning results from consuming fish (e.g., tuna, mackerel, mahi-mahi) that has been improperly stored, leading to bacterial conversion of histidine to histamine, causing an allergic-like reaction. The "assault" component indicates the poisoning was not accidental but rather a deliberate act.

Apply this code when documentation clearly states a patient presented with symptoms consistent with scombroid poisoning (e.g., flushing, headache, palpitations, gastrointestinal upset) and there is explicit medical or legal documentation indicating the poisoning was the result of an assault. This would be used for the initial treatment of the acute poisoning event.

• Ensure documentation explicitly supports both scombroid poisoning and the "assault" nature of the event.
• Always assign an external cause code (e.g., Y04.XXXA) to further describe the assault.
• Use a subsequent encounter code (e.g., T61.13XD) for follow-up care related to the poisoning after the initial treatment.