T61.13XA Scombroid fish poisoning, assault, initial encounter

Name of the Condition

• Common Name(s): Scombroid Fish Poisoning, Histamine Fish Poisoning
• Technical Terms: Scombroid Fish Poisoning, Assault

Summary

Scombroid fish poisoning is a foodborne illness caused by consuming fish with elevated levels of histamine. This condition typically results from improper handling or storage of certain fish species, leading to bacterial growth and histamine production. Symptoms usually appear within minutes to hours after ingestion and may mimic allergic reactions. The "assault" designation indicates the ingestion was deliberate and non-consensual.

Causes

The primary cause is consuming fish that has not been properly refrigerated or stored, allowing bacteria to convert histidine into histamine. Fish species prone to this include tuna, mackerel, mahi-mahi, and other dark-meat fish. Cooking or freezing does not reduce histamine levels, so contamination persists even after preparation.

Risk Factors

• Eating fish from unrefrigerated or poorly stored sources.
• Consumption of fish with high histidine content (e.g., tuna, mackerel).
• Inadequate food safety practices during handling or storage.
• Purchasing fish from unregulated or unverified suppliers.

Symptoms

• Gastrointestinal: Nausea, vomiting, diarrhea, abdominal cramps.
• Neurological: Headache, flushing, dizziness, palpitations.
• Dermatological: Urticaria (hives), itching, facial swelling.
• Respiratory: Wheezing or difficulty breathing (rare).

Diagnosis

Diagnosis is primarily clinical, based on a history of consuming fish followed by rapid onset of symptoms. Laboratory tests may confirm elevated histamine levels in the fish or patient samples, though this is not always necessary. Differentiation from allergic reactions or other foodborne illnesses may be required.

Treatment Options

Treatment focuses on symptom management. Antihistamines (e.g., diphenhydramine) can alleviate symptoms like flushing and itching. Intravenous fluids may be used for dehydration from vomiting or diarrhea. Severe cases with respiratory distress may require additional interventions, but most patients recover within 24 hours.

Prognosis and Follow-Up

Prognosis is generally excellent with prompt treatment, as symptoms typically resolve within hours to a day. Follow-up is rarely needed unless complications arise. Patients should avoid consuming improperly stored fish in the future to prevent recurrence.

Complications

Complications are rare but may include severe respiratory distress, hypotension, or prolonged gastrointestinal symptoms. In rare cases, hospitalization may be required for supportive care.

Lifestyle & Prevention

Preventive measures include proper refrigeration of fish immediately after catch, avoiding consumption of fish with signs of spoilage, and ensuring food safety practices during storage and preparation. Educating patients on recognizing high-risk fish species can reduce future incidents.

When to Seek Professional Help

Seek medical attention if symptoms are severe (e.g., difficulty breathing, significant hypotension) or if gastrointestinal symptoms lead to dehydration. Prompt care is recommended for confirmation and symptom management.

Tips for Medical Coders

Use T61.13XA for initial encounters of scombroid fish poisoning with an assault context. Document the deliberate, non-consensual nature of the ingestion and confirm the initial encounter status. Ensure clinical correlation between symptoms and fish consumption history.