B16 Acute hepatitis B

Name of the Condition

• Acute hepatitis B

Summary

Acute hepatitis B is a viral infection that causes inflammation of the liver. It is typically a short-term illness that may resolve on its own or progress to chronic infection in some cases. The condition is characterized by liver damage resulting from the hepatitis B virus (HBV) and can present with varying severity, from mild symptoms to acute liver failure.

Causes

Acute hepatitis B is caused by the hepatitis B virus (HBV), a DNA virus that infects liver cells. The virus spreads through contact with infectious blood or bodily fluids, including unprotected sexual contact, sharing needles, or perinatal transmission from an infected mother to her newborn. Unlike chronic hepatitis B, acute infection is defined by the absence of detectable HBV surface antigen for more than six months.

Risk Factors

• Unprotected sexual contact with an infected person
• Sharing needles or syringes for drug use
• Occupational exposure to blood (e.g., healthcare workers)
• Living in close contact with someone who has chronic HBV
• Travel to regions with high HBV prevalence
• Receiving blood transfusions or organ transplants in areas with inadequate screening

Symptoms

• Fatigue and malaise
• Fever and chills
• Nausea, vomiting, or abdominal pain
• Loss of appetite
• Dark urine or clay-colored stools
• Jaundice (yellowing of the skin and eyes)
• Joint pain or swelling

Diagnosis

Diagnosis involves blood tests to detect HBV antigens (e.g., HBsAg) and antibodies (e.g., IgM anti-HBc), which indicate acute infection. Liver function tests assess liver damage, while imaging or biopsy may be used to evaluate severity. Clinical evaluation includes a review of symptoms and exposure history.

Treatment Options

• Supportive care: rest, hydration, and nutrition to aid recovery
• Antiviral medications (e.g., tenofovir, entecavir) for severe cases or high viral loads
• Monitoring for liver function deterioration or progression to chronic infection
• Avoidance of alcohol and hepatotoxic substances

Prognosis and Follow-Up

Most adults with acute hepatitis B recover fully within a few months, with the virus cleared from the body. However, a small percentage may develop chronic infection, particularly infants or immunocompromised individuals. Follow-up includes regular liver function testing and screening for complications like cirrhosis or liver cancer.

Complications

• Fulminant hepatitis (sudden liver failure)
• Chronic hepatitis B infection
• Cirrhosis (scarring of the liver)
• Hepatocellular carcinoma (liver cancer)
• Liver failure requiring transplantation

Lifestyle & Prevention

• Vaccination: The hepatitis B vaccine is highly effective in preventing infection.
• Safe practices: Use protection during sex and avoid sharing needles.
• Hygiene: Wash hands thoroughly after potential exposure to blood or bodily fluids.
• Screening: Get tested if at risk, especially before travel to endemic regions.

When to Seek Professional Help

Seek immediate medical attention if you experience severe abdominal pain, confusion, jaundice, or signs of liver failure (e.g., bleeding, swelling). Contact a healthcare provider if symptoms persist or worsen, or if you have a known exposure to HBV.

Tips for Medical Coders

When coding for acute hepatitis B (B16), document the absence of delta-agent involvement and hepatic coma, as these distinctions affect code specificity. Ensure clinical documentation supports the acute nature of the infection, including lab results (e.g., positive HBsAg, IgM anti-HBc) and symptom onset. Verify that the code aligns with the patient’s diagnosis and treatment plan to reflect the condition accurately.