D71 Functional disorders of polymorphonuclear neutrophils

Name of the Condition

• Functional disorders of polymorphonuclear neutrophils

Summary

Functional disorders of polymorphonuclear neutrophils (PMNs) are conditions where neutrophils, a type of white blood cell, have impaired function despite normal numbers. These disorders affect the immune system's ability to fight infections, particularly bacterial and fungal infections, due to defects in neutrophil activity such as chemotaxis, phagocytosis, or killing mechanisms.

Causes

The exact causes of functional disorders of PMNs are often genetic, resulting from mutations in genes involved in neutrophil function. Acquired causes may include autoimmune conditions, medications, or underlying diseases that disrupt neutrophil activity. In some cases, the cause remains unknown.

Risk Factors

• Genetic predisposition (e.g., inherited disorders)
• Autoimmune diseases (e.g., systemic lupus erythematosus)
• Certain medications (e.g., chemotherapy, immunosuppressants)
• Underlying hematologic or metabolic disorders
• Chronic infections that may alter neutrophil function

Symptoms

• Recurrent or severe bacterial or fungal infections (e.g., skin, respiratory, or oral infections)
• Delayed wound healing
• Fever with unknown source
• Persistent or unusual infections despite treatment
• Inflammation or tissue damage from impaired immune response

Diagnosis

Diagnosis involves clinical evaluation of infection history, blood tests to assess neutrophil counts and function, and specialized tests (e.g., chemotaxis, phagocytosis assays) to identify functional defects. Genetic testing may be considered for suspected inherited disorders. Imaging or cultures may help identify infection sources.

Treatment Options

Treatment focuses on managing infections with targeted antibiotics or antifungals. Supportive care includes infection prevention (e.g., hygiene, vaccinations) and addressing underlying causes. In severe cases, therapies to enhance neutrophil function or hematopoietic stem cell transplantation may be considered.

Prognosis and Follow-Up

Prognosis varies depending on the severity and underlying cause. Early diagnosis and prompt treatment of infections improve outcomes. Regular follow-up is essential to monitor for recurrent infections and adjust management. Long-term prognosis depends on the ability to control infections and manage associated conditions.

Complications

• Severe or life-threatening infections (e.g., sepsis)
• Chronic tissue damage from recurrent infections
• Delayed growth or development in children
• Increased risk of autoimmune or inflammatory complications

Lifestyle & Prevention

• Practice good hygiene to reduce infection risk
• Stay up-to-date with vaccinations (e.g., pneumococcal, influenza)
• Avoid exposure to known infection sources
• Promptly treat even minor infections
• Follow medical advice for managing underlying conditions

When to Seek Professional Help

Seek medical attention for:

• Persistent or worsening infections
• Fever with no clear cause
• Signs of severe infection (e.g., difficulty breathing, confusion)
• Recurrent infections despite treatment
• Unusual or unexplained symptoms affecting immune function

Tips for Medical Coders

When coding for functional disorders of polymorphonuclear neutrophils (ICD-10-CM code D71), ensure documentation supports the diagnosis, including clinical findings, laboratory results, and any underlying causes. Verify that the code aligns with the specific type of neutrophil dysfunction (e.g., chemotactic defects, phagocytic disorders) and that associated conditions are coded separately if applicable.