B00.2 Herpesviral gingivostomatitis and pharyngotonsillitis

Name of the Condition

• Herpesviral gingivostomatitis and pharyngotonsillitis

Summary

Herpesviral gingivostomatitis and pharyngotonsillitis is an acute infection of the oral cavity and pharynx caused by the herpes simplex virus (HSV). It typically presents with painful ulcerative lesions affecting the gums, mouth, and throat, often accompanied by systemic symptoms. The condition is most common in young children but can occur in individuals of any age, particularly those with primary HSV infection.

Causes

The condition is caused by infection with the herpes simplex virus (HSV), primarily HSV-1. Transmission occurs through direct contact with infected saliva, lesions, or asymptomatic viral shedding. Primary infection in individuals without prior HSV exposure leads to more severe manifestations compared to recurrent episodes.

Risk Factors

• Lack of prior HSV immunity, especially in young children.
• Close contact with infected individuals, such as household members or daycare settings.
• Immunocompromised states, including HIV, chemotherapy, or chronic steroid use.
• Age, with primary infection most common in children aged 6 months to 5 years.

Symptoms

• Painful ulcerative lesions on the gums, tongue, buccal mucosa, or pharynx.
• Swollen, erythematous gums (gingivitis) with easy bleeding.
• Sore throat, dysphagia, or odynophagia.
• Fever, malaise, and irritability, particularly in children.
• Cervical lymphadenopathy.

Diagnosis

Diagnosis is typically based on clinical presentation, including characteristic oral and pharyngeal lesions. Laboratory confirmation may be obtained through viral culture, polymerase chain reaction (PCR) testing of lesion swabs, or serologic testing for HSV antibodies in cases of primary infection. Tzanck smears may show multinucleated giant cells but are less commonly used.

Treatment Options

• Supportive care, including hydration, pain management with analgesics or topical anesthetics.
• Antiviral medications (e.g., acyclovir, valacyclovir) for severe or immunocompromised patients.
• Antipyretics for fever.
• Oral hygiene measures to promote healing and reduce discomfort.

Prognosis and Follow-Up

Most cases resolve within 7–14 days with supportive care. Primary infection confers lifelong HSV immunity, though viral latency may lead to recurrent episodes. Follow-up is generally not required unless complications arise or symptoms persist beyond two weeks.

Complications

• Dehydration due to painful swallowing.
• Secondary bacterial infections of oral lesions.
• Rarely, dissemination in immunocompromised individuals.
• Potential for recurrent HSV infections in the future.

Lifestyle & Prevention

• Avoid sharing utensils, towels, or oral hygiene items during active infection.
• Practice good hand hygiene to reduce transmission risk.
• Maintain oral hygiene to prevent secondary infections.
• Immunocompromised individuals should avoid close contact with infected persons.

When to Seek Professional Help

Seek medical attention if symptoms worsen, dehydration occurs, fever persists beyond 3 days, or lesions spread beyond the oral cavity. Immediate care is recommended for immunocompromised patients or those with severe systemic symptoms.

Tips for Medical Coders

Document the presence of gingival involvement, stomatitis, and pharyngotonsillitis to support the B00.2 code. Specify if the infection is primary or recurrent, and note any immunocompromised status or complications. Ensure clinical correlation with lesion location and systemic symptoms for accurate coding.