Other fish poisoning, undetermined, initial encounter

This code signifies a patient presenting with symptoms of poisoning due to consuming fish, where the specific type of fish or toxin responsible for the reaction has not yet been identified. It covers a range of non-specific adverse reactions to fish ingestion that are not classified as ciguatera, scombroid, or other specified fish poisonings.

Apply this code when a patient presents with acute symptoms like nausea, vomiting, diarrhea, abdominal pain, or neurological disturbances following fish consumption, and the medical documentation indicates "fish poisoning" without further specification. This is appropriate for the initial assessment and treatment of such an event before a definitive cause is determined.

• Ensure documentation clearly states "undetermined" or "unspecified" fish poisoning.
• Confirm this is the patient's first encounter for this specific poisoning event.
• If the type of fish poisoning is later identified (e.g., ciguatera), update the diagnosis to a more specific code.