T61.13XD Scombroid fish poisoning, assault, subsequent encounter

Name of the Condition

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

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, while "subsequent encounter" refers to a patient seeking care during a later phase of treatment for this condition.

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 are rarely needed but may include measuring histamine levels in leftover fish or patient samples. Differentiation from allergic reactions or other foodborne illnesses is important, as treatment approaches may vary.

Treatment Options

Treatment focuses on symptom relief, as the condition is self-limiting. Antihistamines (e.g., diphenhydramine) may reduce symptoms like itching or flushing. Intravenous fluids can address dehydration from vomiting or diarrhea. Severe cases with respiratory distress may require additional supportive care.

Prognosis and Follow-Up

Most patients recover fully within 24 hours with appropriate treatment. Follow-up is generally not required unless complications arise or symptoms persist. Patients should be advised to avoid improperly stored fish in the future to prevent recurrence.

Complications

Rare complications include severe respiratory distress, hypotension, or prolonged gastrointestinal symptoms. These are more likely in individuals with pre-existing conditions or those who received delayed treatment.

Lifestyle & Prevention

• Ensure fish is refrigerated promptly after purchase and cooked thoroughly.
• Avoid consuming fish with a strong, peppery, or "off" odor, which may indicate histamine buildup.
• Purchase fish from reputable sources with proper handling practices.
• Educate others about safe seafood storage and preparation.

When to Seek Professional Help

Seek medical attention if symptoms are severe (e.g., difficulty breathing, fainting) or if they persist beyond 24 hours. Immediate care is recommended for individuals with a history of allergic reactions to fish or shellfish.

Tips for Medical Coders

Use T61.13XD for cases of scombroid fish poisoning resulting from assault, where the patient is receiving subsequent care for this condition. Document the assault context and the timing of the encounter (subsequent) to support code assignment. Ensure clinical documentation aligns with the "subsequent encounter" definition, typically indicating active treatment for a condition with no recent exacerbation.