D70.4 Cyclic neutropenia

Name of the Condition

• Cyclic neutropenia

Summary

Cyclic neutropenia is a rare hematologic disorder characterized by periodic fluctuations in neutrophil counts, typically occurring in cycles of 21 days. Neutrophils, a type of white blood cell, are essential for fighting bacterial infections. During periods of low neutrophil counts (neutropenia), individuals are at increased risk of infections, particularly in the mouth, throat, and skin. The condition is often present from birth and may persist throughout life, with symptoms varying in severity between cycles.

Causes

Cyclic neutropenia is caused by genetic mutations, most commonly in the ELANE gene, which encodes neutrophil elastase. These mutations disrupt the normal maturation and survival of neutrophil precursors in the bone marrow, leading to periodic drops in neutrophil production. The condition is typically inherited in an autosomal dominant pattern, meaning a single mutated gene from one parent can cause the disorder.

Risk Factors

• Family history of cyclic neutropenia or related neutropenic disorders
• Inheritance of a mutated ELANE gene or other associated genetic variants
• Presence of autosomal dominant inheritance patterns in the family

Symptoms

• Recurrent bacterial infections, especially in the mouth, throat, or skin
• Fever during periods of neutropenia
• Mouth ulcers or gum inflammation
• Skin infections or abscesses
• Fatigue or malaise
• Mild to moderate anemia or thrombocytopenia in some cases

Diagnosis

Diagnosis is confirmed through serial complete blood counts (CBCs) showing periodic neutropenia, typically with neutrophil counts dropping below 500 cells per microliter. Bone marrow aspiration may reveal normal or increased myeloid precursors, and genetic testing can identify mutations in the ELANE gene or other associated genes. Clinical correlation with symptom cycles is essential for confirmation.

Treatment Options

Treatment focuses on managing infections and supporting neutrophil levels. Antibiotics are used to treat bacterial infections, and granulocyte colony-stimulating factor (G-CSF) may be prescribed to stimulate neutrophil production. Prophylactic antibiotics or antifungals may be considered in severe cases. Regular monitoring of blood counts and infection surveillance is standard.

Prognosis and Follow-Up

With appropriate management, prognosis is generally good, though recurrent infections may occur. Long-term follow-up includes regular blood tests to monitor neutrophil cycles and adjust treatment as needed. Early detection and prompt treatment of infections are critical to prevent complications. Most individuals can lead relatively normal lives with proper care.

Complications

• Severe or life-threatening infections, particularly during neutropenic periods
• Chronic or recurrent oral or skin infections
• Potential for sepsis if infections are not treated promptly
• Delayed growth or development in children in rare cases

Lifestyle & Prevention

• Maintain good oral hygiene to reduce infection risk
• Avoid close contact with individuals who have active infections
• Practice hand hygiene regularly
• Follow up with healthcare providers as scheduled for blood count monitoring
• Report any signs of infection (e.g., fever, sore throat) immediately

When to Seek Professional Help

Seek medical attention if you experience:

• Fever or chills
• Sore throat, mouth ulcers, or difficulty swallowing
• Skin redness, swelling, or pus
• Unusual fatigue or weakness
• Any signs of infection during a known neutropenic period

Tips for Medical Coders

When coding for cyclic neutropenia (ICD10CM code D70.4), ensure documentation supports the periodic nature of neutropenia and associated infections. Include details on genetic testing results, if available, and any treatments (e.g., G-CSF) or prophylactic measures. Verify that the diagnosis aligns with clinical findings and exclude other causes of neutropenia. Accurate coding requires clear documentation of symptom cycles and laboratory results.