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ICD-10 Guide
ICD-10 CodesN01.3

N01.3

Billable

Rapidly progressive nephritic syndrome with diffuse mesangial proliferative glomerulonephritis

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

Code Description

ICD-10 N01.3 is a billable code used to indicate a diagnosis of rapidly progressive nephritic syndrome with diffuse mesangial proliferative glomerulonephritis.

Key Diagnostic Point:

Rapidly progressive nephritic syndrome (RPNS) is characterized by a swift decline in renal function, often leading to end-stage renal disease within weeks to months. This condition is associated with diffuse mesangial proliferative glomerulonephritis, which is marked by an increase in mesangial cell proliferation and matrix deposition in the glomeruli. Clinically, patients present with a triad of symptoms: hematuria, proteinuria, and hypertension, often accompanied by acute kidney injury. Laboratory findings typically reveal significant proteinuria, often exceeding 3.5 grams per day, and the presence of red blood cell casts in the urine. Renal biopsy is crucial for diagnosis, showing diffuse mesangial hypercellularity and immune complex deposition. Management involves addressing the underlying cause, which may include immunosuppressive therapy, and supportive care for renal function. Early recognition and treatment are essential to prevent irreversible kidney damage.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Requires understanding of nephrology terminology and conditions.
  • Differentiation from other types of glomerulonephritis.
  • Need for accurate documentation of clinical findings and lab results.
  • Potential for multiple underlying causes requiring detailed coding.

Audit Risk Factors

  • Inadequate documentation of clinical findings.
  • Failure to document the underlying cause of nephritis.
  • Misclassification of the type of glomerulonephritis.
  • Lack of supporting lab results for proteinuria and hematuria.

Specialty Focus

Medical Specialties

Nephrology

Documentation Requirements

Detailed clinical notes on symptoms, lab results, and treatment plans.

Common Clinical Scenarios

Patients presenting with acute kidney injury and nephritic syndrome.

Billing Considerations

Ensure all lab results, especially urinalysis and biopsy findings, are documented.

Pathology

Documentation Requirements

Comprehensive reports on renal biopsy findings.

Common Clinical Scenarios

Biopsy evaluations for suspected glomerulonephritis.

Billing Considerations

Pathology reports must clearly indicate the type of glomerular disease.

Coding Guidelines

Inclusion Criteria

Use N01.3 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of the clinical picture, including symptoms, lab results, and treatment plans

Exclusion Criteria

Do NOT use N01.3 When
  • Exclude codes that do not reflect the rapidly progressive nature of the nephritic syndrome

Related ICD-10 Codes

Related CPT Codes

88172CPT Code

Renal biopsy, percutaneous

Clinical Scenario

Used when a renal biopsy is performed to confirm diagnosis.

Documentation Requirements

Document indication for biopsy and findings.

Specialty Considerations

Nephrology specialists should ensure biopsy results are clearly linked to the diagnosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of nephritic syndromes, improving the accuracy of diagnoses and treatment tracking. N01.3 provides a clear distinction for rapidly progressive cases, which is crucial for appropriate management and reimbursement.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of nephritic syndromes, improving the accuracy of diagnoses and treatment tracking. N01.3 provides a clear distinction for rapidly progressive cases, which is crucial for appropriate management and reimbursement.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    American Academy of Nephrology

Coding & Billing References

  • •
    American Academy of Nephrology

Frequently Asked Questions

What are the key symptoms of rapidly progressive nephritic syndrome?

Key symptoms include hematuria, proteinuria, hypertension, and signs of acute kidney injury.

How is rapidly progressive nephritic syndrome diagnosed?

Diagnosis is typically made through clinical evaluation, urinalysis, and renal biopsy findings.

What is the treatment for rapidly progressive nephritic syndrome?

Treatment often involves immunosuppressive therapy and management of underlying conditions, along with supportive care for renal function.