B27.90 Infectious mononucleosis, unspecified without complication

Name of the Condition

• Infectious mononucleosis, unspecified without complication

Summary

Infectious mononucleosis is a viral infection commonly caused by the Epstein-Barr virus (EBV). It is characterized by symptoms such as fever, sore throat, and swollen lymph nodes. The condition primarily affects adolescents and young adults but can occur in other age groups. Most cases resolve with supportive care, though complications may arise in some individuals.

Causes

Infectious mononucleosis is most often caused by the Epstein-Barr virus (EBV), a member of the herpesvirus family. The virus spreads through saliva, which can occur through kissing, sharing utensils or beverages, or other close contact. Less commonly, other viruses such as cytomegalovirus (CMV) or toxoplasma may cause similar symptoms.

Risk Factors

• Adolescents and young adults, particularly those in close-contact environments like college dormitories.
• Exposure to EBV, especially in settings with frequent interpersonal contact.
• Weakened immune system due to conditions like HIV/AIDS or immunosuppressive therapy.

Symptoms

• Persistent fatigue
• Fever
• Sore throat, often severe
• Swollen lymph nodes in the neck and armpits
• Enlarged spleen or liver (in some cases)
• Rash (less common)

Diagnosis

Diagnosis typically involves a combination of clinical evaluation and laboratory testing. A physical exam may reveal swollen lymph nodes or an enlarged spleen. Blood tests, such as the Monospot test or EBV antibody test, can confirm infection. Additional tests may be used to rule out other conditions with similar symptoms.

Treatment Options

There is no specific treatment for mono; management focuses on relieving symptoms. Rest and adequate hydration are crucial. Over-the-counter pain relievers and fever reducers can help alleviate discomfort. In severe cases, corticosteroids may be prescribed to reduce swelling.

Prognosis and Follow-Up

Most individuals recover fully within a few weeks, though fatigue may persist for months. Follow-up care may involve monitoring for complications, such as an enlarged spleen, which requires avoiding contact sports. Regular check-ins with a healthcare provider ensure symptoms resolve without issues.

Complications

While rare, complications can include an enlarged spleen (risk of rupture), hepatitis, or neurological issues. Severe cases may require hospitalization for supportive care.

Lifestyle & Prevention

• Avoid sharing personal items like utensils or beverages to reduce transmission.
• Practice good hygiene, including frequent handwashing.
• Rest adequately during acute illness to support recovery.

When to Seek Professional Help

Seek medical attention if symptoms worsen, such as severe sore throat, difficulty breathing, or abdominal pain (signs of spleen enlargement). Persistent fatigue or unexplained symptoms should also prompt evaluation.

Tips for Medical Coders

This code (B27.90) is used for infectious mononucleosis without specified complications. Ensure documentation supports the absence of complications to justify this code. Review clinical notes for details on symptom severity, diagnostic tests, and treatment to confirm appropriate coding.