Scombroid fish poisoning, undetermined, subsequent encounter

This code signifies a patient presenting with symptoms of scombroid fish poisoning where the intent (accidental, intentional self-harm, assault) is not documented or cannot be determined. The patient is in the healing phase of the poisoning, receiving follow-up care, or experiencing residual effects. Scombroid poisoning results from consuming fish containing high levels of histamine due to improper storage.

Use this code for patients returning for follow-up appointments related to scombroid fish poisoning, such as monitoring for lingering symptoms like flushing, headache, or gastrointestinal upset. It is appropriate when the initial acute phase of treatment has passed, and the encounter is for continued management or assessment of recovery, and the circumstances of the poisoning are unknown.

• Ensure documentation clearly indicates the encounter is "subsequent" and that the intent of the poisoning is "undetermined."
• Do not use this code for the initial acute treatment of scombroid poisoning; refer to the initial encounter codes.
• Always sequence this code after any codes for specific symptoms or complications being treated during the subsequent encounter.