N04.1 Nephrotic syndrome with focal and segmental glomerular lesions

Name of the Condition

• Nephrotic Syndrome with Focal and Segmental Glomerular Lesions
• ICD-10 Code N04.1

Summary

Nephrotic syndrome with focal and segmental glomerular lesions is a kidney disorder defined by proteinuria, hypoalbuminemia, hyperlipidemia, and edema, with underlying focal and segmental glomerular scarring. The condition involves damage to the kidney's filtering units (glomeruli), where only parts of the glomeruli are affected, leading to impaired filtration and protein loss.

Causes

Primary causes include focal segmental glomerulosclerosis (FSGS), a specific type of glomerular disease. Secondary causes may involve conditions like diabetes, hypertension, infections, or medications that damage the glomeruli. In some cases, the exact cause remains unknown.

Risk Factors

• Genetic predisposition to glomerular diseases
• Conditions such as obesity, HIV, or sickle cell disease
• Certain medications (e.g., NSAIDs, lithium)
• Prior kidney disease or injury

Symptoms

• Severe swelling (edema) in the legs, ankles, or around the eyes
• Foamy or frothy urine due to excess protein
• Unexplained weight gain from fluid retention
• Fatigue and loss of appetite
• High cholesterol levels

Diagnosis

Diagnosis involves urine tests to detect proteinuria, blood tests to assess kidney function and protein levels, and a kidney biopsy to confirm focal and segmental glomerular lesions. Imaging or additional tests may rule out secondary causes.

Treatment Options

• Corticosteroids or immunosuppressants to reduce inflammation
• Angiotensin-converting enzyme (ACE) inhibitors or angiotensin receptor blockers (ARBs) to control proteinuria
• Cholesterol-lowering medications (statins)
• Dietary modifications (low-sodium, protein-controlled diet)
• Management of underlying conditions (e.g., diabetes)

Prognosis and Follow-Up

Prognosis varies depending on the cause and response to treatment. Some patients achieve remission, while others may progress to chronic kidney disease. Regular monitoring of kidney function, blood pressure, and protein levels is essential. Follow-up care may include ongoing medication adjustments and lifestyle support.

Complications

• Chronic kidney disease or kidney failure
• Blood clots (thromboembolism) due to protein loss
• Infections from weakened immunity
• Malnutrition or vitamin deficiencies
• Cardiovascular disease from high cholesterol

Lifestyle & Prevention

• Maintain a low-sodium, balanced diet to reduce swelling
• Stay hydrated and avoid excessive fluid retention
• Manage underlying conditions (e.g., diabetes, hypertension)
• Avoid nephrotoxic medications (e.g., NSAIDs) unless directed
• Regular exercise and weight management (if applicable)

When to Seek Professional Help

Seek immediate medical attention for:

• Sudden, severe swelling (especially in the face or limbs)
• Blood in urine or foamy urine
• Unexplained weight gain or shortness of breath
• Persistent fatigue or confusion
• Signs of infection (fever, chills)

Tips for Medical Coders

Document the presence of focal and segmental glomerular lesions confirmed by biopsy or imaging. Ensure clinical correlation with proteinuria, edema, or other nephrotic syndrome symptoms. Code N04.1 is specific to this morphologic pattern; avoid using it for unspecified or other glomerular changes.