Ciguatera fish poisoning, undetermined, initial encounter

This code signifies a case of ciguatera fish poisoning where the specific type of ciguatoxin or the exact source of the contaminated fish cannot be definitively identified. Patients typically present with a range of gastrointestinal, neurological, and cardiovascular symptoms after consuming certain reef fish. The "undetermined" aspect indicates a lack of precise diagnostic information regarding the toxin.

Apply this code when a patient presents with symptoms consistent with ciguatera poisoning, and the medical record clearly indicates that the specific type of ciguatoxin or the exact fish species responsible for the poisoning remains unconfirmed. This is appropriate for the initial visit for treatment of the acute poisoning event.

• Ensure documentation supports the "undetermined" nature of the poisoning, meaning no specific ciguatoxin or fish source is identified.
• This code is for the initial encounter for treatment of the acute poisoning. Subsequent encounters would require a different seventh character.
• Do not use if a specific ciguatoxin or fish source is documented; instead, use a more specific code from the T61.0- series.