B17.1 Acute hepatitis C

Name of the Condition

• Acute hepatitis C

Summary

Acute hepatitis C is an acute inflammation of the liver caused by the hepatitis C virus (HCV). This condition typically presents with mild to moderate symptoms and may resolve spontaneously, though it can progress to chronic infection in a significant proportion of cases. The acute phase is characterized by liver injury resulting from the viral infection, which may be asymptomatic or cause nonspecific symptoms.

Causes

Acute hepatitis C is caused by infection with the hepatitis C virus (HCV), a bloodborne pathogen. Transmission occurs through exposure to infected blood or bodily fluids, such as through sharing needles, unscreened blood transfusions, or less commonly, through sexual contact or perinatal exposure. The virus targets liver cells, leading to inflammation and potential liver damage during the acute phase.

Risk Factors

• Intravenous drug use or sharing of needles/syringes.
• Receipt of unscreened blood products or organ transplants prior to widespread HCV testing.
• Occupational exposure to blood (e.g., healthcare workers with needlestick injuries).
• Unprotected sexual contact with an HCV-positive individual.
• Birth to an HCV-positive mother (perinatal transmission).

Symptoms

• Fatigue and malaise.
• Jaundice (yellowing of the skin and eyes).
• Abdominal pain, particularly in the upper right quadrant.
• Dark urine.
• Pale or clay-colored stools.
• Nausea and vomiting.
• Loss of appetite.

Diagnosis

Diagnosis involves confirming acute HCV infection through laboratory testing. This includes detecting HCV RNA in the blood to confirm active infection, as well as measuring liver enzymes (e.g., ALT, AST) to assess liver inflammation. Serologic tests for HCV antibodies may also be used, though these can take time to develop. Additional tests, such as liver function panels or imaging, may be performed to evaluate liver damage.

Treatment Options

Treatment for acute hepatitis C focuses on antiviral therapy to clear the virus and prevent progression to chronic infection. Direct-acting antiviral (DAA) medications are typically used, as they are highly effective and well-tolerated. Supportive care, including rest and hydration, may also be recommended. Alcohol and hepatotoxic medications should be avoided to reduce liver stress.

Prognosis and Follow-Up

The prognosis for acute hepatitis C varies; some individuals clear the virus spontaneously, while others develop chronic infection. Follow-up involves monitoring liver function and HCV RNA levels to assess viral clearance or progression. Regular testing is important to detect chronic infection early, as untreated chronic hepatitis C can lead to cirrhosis or liver cancer over time.

Complications

• Progression to chronic hepatitis C, which may cause long-term liver damage.
• Cirrhosis (scarring of the liver) with potential for liver failure.
• Increased risk of hepatocellular carcinoma (liver cancer).
• Extrahepatic manifestations, such as cryoglobulinemia or kidney disease.

Lifestyle & Prevention

• Avoid sharing needles or other drug paraphernalia.
• Practice safe sex, including using barrier protection.
• Ensure medical procedures use screened blood products.
• Do not share personal items that may contact blood (e.g., razors, toothbrushes).
• Limit alcohol consumption to reduce liver stress.

When to Seek Professional Help

Seek medical attention if you experience symptoms of acute hepatitis (e.g., jaundice, severe fatigue, abdominal pain) or have risk factors for HCV exposure. Early diagnosis and treatment can improve outcomes and reduce the risk of chronic infection. Prompt care is also advised if symptoms worsen or if you have a known exposure to HCV.

Tips for Medical Coders

When coding for acute hepatitis C (B17.1), ensure documentation supports the acute nature of the infection. Verify that the diagnosis is based on clinical presentation, laboratory confirmation of HCV RNA, or serologic evidence of recent infection. Note any associated risk factors or transmission routes, as these may impact coding specificity. Avoid using this code for chronic hepatitis C, which is classified separately.