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ICD-10 Guide
ICD-10 CodesN03.3

N03.3

Billable

Chronic nephritic syndrome with diffuse mesangial proliferative glomerulonephritis

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/18/2025

Code Description

ICD-10 N03.3 is a billable code used to indicate a diagnosis of chronic nephritic syndrome with diffuse mesangial proliferative glomerulonephritis.

Key Diagnostic Point:

Chronic nephritic syndrome with diffuse mesangial proliferative glomerulonephritis is characterized by persistent inflammation of the glomeruli, leading to a gradual decline in renal function. This condition is often associated with significant proteinuria, hematuria, and hypertension. The diffuse mesangial proliferation indicates an increase in mesangial cells and matrix, which can be identified through renal biopsy. Patients may present with symptoms such as edema, fatigue, and decreased urine output. The underlying pathophysiology involves immune-mediated damage to the glomeruli, often linked to systemic diseases such as lupus or infections. Management typically includes controlling blood pressure, reducing proteinuria with ACE inhibitors or ARBs, and addressing any underlying conditions. Regular monitoring of renal function and laboratory parameters is essential to assess disease progression and treatment efficacy.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Requires understanding of nephrology terminology and conditions.
  • Differentiation from other types of glomerulonephritis.
  • Need for accurate documentation of symptoms and lab findings.
  • Potential overlap with nephrotic syndrome codes.

Audit Risk Factors

  • Inadequate documentation of renal biopsy results.
  • Failure to document associated symptoms like hematuria or proteinuria.
  • Misclassification with nephrotic syndrome codes.
  • Lack of follow-up documentation on management and outcomes.

Specialty Focus

Medical Specialties

Nephrology

Documentation Requirements

Detailed renal function tests, biopsy results, and treatment plans.

Common Clinical Scenarios

Patients presenting with chronic kidney disease, hypertension, and proteinuria.

Billing Considerations

Ensure all lab results and clinical findings are documented to support the diagnosis.

Internal Medicine

Documentation Requirements

Comprehensive patient history, physical examination findings, and management strategies.

Common Clinical Scenarios

Management of patients with chronic kidney disease and comorbid conditions.

Billing Considerations

Coordination with nephrology for shared care of complex cases.

Coding Guidelines

Inclusion Criteria

Use N03.3 When
  • Follow official ICD
  • 10 guidelines for nephritis and glomerulonephritis
  • Ensure accurate documentation of the chronic nature of the condition and any associated symptoms

Exclusion Criteria

Do NOT use N03.3 When
  • Exclude other types of nephritis that do not fit the criteria for N03

Related ICD-10 Codes

Related CPT Codes

50360CPT Code

Renal biopsy

Clinical Scenario

When a renal biopsy is performed to confirm the diagnosis of diffuse mesangial proliferative glomerulonephritis.

Documentation Requirements

Document indication for biopsy, consent, and pathology results.

Specialty Considerations

Nephrology specialists should ensure thorough documentation of the biopsy findings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of chronic nephritic syndrome, improving the accuracy of data collection and reimbursement processes. N03.3 provides a clear distinction from other nephritic conditions, facilitating better patient management and research.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of chronic nephritic syndrome, improving the accuracy of data collection and reimbursement processes. N03.3 provides a clear distinction from other nephritic conditions, facilitating better patient management and research.

Reimbursement & Billing Impact

reimbursement processes. N03.3 provides a clear distinction from other nephritic conditions, facilitating better patient management and research.

Resources

Clinical References

  • •
    American Academy of Nephrology

Coding & Billing References

  • •
    American Academy of Nephrology

Frequently Asked Questions

What are the common symptoms of chronic nephritic syndrome?

Common symptoms include edema, hypertension, proteinuria, hematuria, and fatigue. Patients may also experience decreased urine output.

How is chronic nephritic syndrome diagnosed?

Diagnosis typically involves a combination of clinical evaluation, laboratory tests showing proteinuria and hematuria, and renal biopsy to confirm the presence of mesangial proliferation.