B26.81 Mumps hepatitis

Name of the Condition

• Mumps hepatitis

Summary

Mumps hepatitis refers to liver inflammation caused by the mumps virus, a complication of mumps infection. This condition involves hepatic involvement beyond the typical parotid gland swelling associated with mumps. The liver inflammation may occur alongside or after the primary mumps symptoms, requiring specific clinical evaluation.

Causes

Mumps hepatitis is caused by the mumps virus, an RNA virus from the Paramyxoviridae family. The virus spreads through respiratory droplets or direct contact with infected saliva. Hepatitis develops when the virus affects liver tissue, leading to inflammation and potential liver function abnormalities.

Risk Factors

• Lack of vaccination against mumps.
• Close contact with an infected individual.
• Immunocompromised states, such as HIV/AIDS or chemotherapy.
• Age, with adolescents and young adults at higher risk for complications.
• Underlying liver conditions that may predispose to severe infection.

Symptoms

• Swelling and tenderness of one or both parotid glands (salivary glands).
• Fever.
• Headache.
• Muscle aches.
• Fatigue.
• Loss of appetite.
• Abdominal pain or discomfort (hepatic involvement).
• Jaundice (yellowing of skin or eyes) in some cases.
• Dark urine or pale stools (signs of liver dysfunction).

Diagnosis

Diagnosis is typically based on clinical presentation, including parotid gland swelling and hepatic symptoms. Laboratory tests, such as liver function tests (LFTs) and mumps serology, may confirm the infection and assess liver involvement. Imaging or other tests may be used to rule out other causes of hepatitis.

Treatment Options

• Supportive care, including rest, hydration, and pain relief (e.g., acetaminophen).
• Monitoring of liver function through regular blood tests.
• Avoidance of hepatotoxic substances (e.g., alcohol) during recovery.
• Hospitalization in severe cases for close monitoring and management.

Prognosis and Follow-Up

Most cases of mumps hepatitis resolve with supportive care, and liver function typically returns to normal. Recovery may take several weeks. Regular follow-up with liver function testing is recommended to ensure resolution and monitor for any persistent abnormalities.

Complications

• Severe liver inflammation leading to elevated liver enzymes.
• Rare cases of acute liver failure (uncommon but possible in high-risk individuals).
• Prolonged recovery if liver function is significantly impaired.

Lifestyle & Prevention

• Ensure up-to-date mumps vaccination (MMR vaccine) to prevent infection.
• Practice good hygiene, such as handwashing and avoiding sharing utensils.
• Avoid close contact with individuals showing mumps symptoms.
• Limit alcohol consumption and avoid hepatotoxic medications during illness.

When to Seek Professional Help

Seek medical attention if you experience:

• Severe abdominal pain or jaundice.
• High fever or persistent symptoms beyond 7–10 days.
• Signs of dehydration or inability to maintain oral intake.
• Worsening liver function tests or new neurological symptoms.

Tips for Medical Coders

When coding for mumps hepatitis (B26.81), ensure documentation supports the diagnosis of both mumps and hepatic involvement. Verify that the clinical notes specify liver inflammation or abnormal liver function tests attributable to the mumps infection. Avoid coding if hepatitis is due to another cause (e.g., viral hepatitis B/C) without clear linkage to mumps. Document the relationship between the mumps infection and hepatitis to justify the code assignment.