N04 Nephrotic syndrome

Name of the Condition

• Nephrotic Syndrome
• ICD-10 Code: N04

Summary

Nephrotic syndrome is a kidney disorder defined by significant protein loss in the urine (proteinuria), low blood protein levels (hypoalbuminemia), high cholesterol (hyperlipidemia), and swelling (edema). It results from damage to the glomeruli, the kidney's filtering units, which allows proteins to leak into the urine. The condition can be primary (affecting the kidneys directly) or secondary (caused by other diseases or factors).

Causes

Primary causes include kidney diseases like minimal change disease or focal segmental glomerulosclerosis. Secondary causes involve systemic conditions such as diabetes, lupus, infections (e.g., hepatitis B/C), or medications (e.g., NSAIDs). In some cases, the underlying cause remains unidentified.

Risk Factors

• Genetic predisposition to kidney disease
• Certain medical conditions (e.g., diabetes, lupus)
• Infections (e.g., hepatitis B/C, HIV)
• Use of specific drugs (e.g., NSAIDs, certain antibiotics)
• Obesity or metabolic syndrome

Symptoms

• Severe swelling (edema), especially around the eyes, feet, and ankles
• Foamy urine due to excess protein
• Weight gain from fluid retention
• Fatigue and loss of appetite
• High cholesterol levels

Diagnosis

Diagnosis involves urine tests to detect proteinuria, blood tests to measure kidney function and protein levels, and sometimes a kidney biopsy to identify underlying changes. Imaging or additional tests may be used to rule out secondary causes.

Treatment Options

• Corticosteroids or immunosuppressants to reduce inflammation
• Angiotensin-converting enzyme (ACE) inhibitors or angiotensin receptor blockers (ARBs) to control blood pressure and reduce proteinuria
• Cholesterol-lowering medications (statins)
• Diuretics to manage swelling
• Dietary modifications (low-sodium, controlled protein intake)

Prognosis and Follow-Up

Prognosis depends on the underlying cause and response to treatment. Some cases resolve with therapy, while others may become chronic or progress to kidney failure. Regular monitoring of kidney function, blood pressure, and protein levels is essential. Follow-up care may include ongoing medication management and lifestyle adjustments.

Complications

• Kidney failure (end-stage renal disease)
• Blood clots (thromboembolism)
• Infections due to low immune function
• Malnutrition or vitamin deficiencies
• High blood pressure (hypertension)

Lifestyle & Prevention

• Maintain a low-sodium diet to reduce swelling
• Limit protein intake as advised by a healthcare provider
• Stay hydrated and avoid excessive fluid retention
• Manage underlying conditions (e.g., diabetes, hypertension)
• Avoid nephrotoxic medications (e.g., NSAIDs) unless prescribed

When to Seek Professional Help

Seek immediate medical attention if you experience sudden severe swelling, blood in urine, chest pain, or difficulty breathing. Regular check-ups are recommended for those with risk factors or a history of kidney disease.

Tips for Medical Coders

Document the underlying cause (if known) and any associated conditions (e.g., diabetes, lupus) to support code specificity. Ensure clinical documentation aligns with the diagnosis and treatment provided, as nephrotic syndrome may require additional codes for complications or comorbidities. Verify that the code N04 is used for nephrotic syndrome without morphologic changes specified, and avoid using it for other kidney disorders.