Scombroid fish poisoning, undetermined, initial encounter

This code signifies a diagnosis of scombroid fish poisoning where the specific type of scombroid fish or the exact toxin responsible is not definitively identified. Patients typically present with symptoms resembling an allergic reaction, such as flushing, headache, palpitations, and gastrointestinal distress, after consuming improperly stored or handled fish. The "undetermined" aspect indicates that while scombroid poisoning is suspected, further specificity is lacking.

Use this code when a patient presents with symptoms consistent with scombroid fish poisoning, and the medical record documents the poisoning but does not specify the exact fish species (e.g., tuna, mackerel, mahi-mahi) or the precise toxin involved. This code is appropriate for the initial encounter when the patient is first seen for this condition.

• Ensure documentation clearly states "scombroid fish poisoning" and that the specific fish or toxin is not identified.
• Confirm this is the patient's first time being treated for this particular episode of poisoning.
• Do not use if a more specific type of fish poisoning is documented (e.g., ciguatera, shellfish).