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ICD-10 Guide
DiagnosesFsgs

Fsgs

ICD-10 Coding for Focal Segmental Glomerulosclerosis(N04.1)

PRIMARY SPECIALTYNephrology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Fsgs?
Essential facts and insights about Focal Segmental Glomerulosclerosis

Key Clinical Considerations:

  • Proteinuria greater than 3.5 g/day
  • Edema, hypertension, and possible renal insufficiency
  • Presence of nephrotic syndrome symptoms

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including onset and duration of symptoms
  • Results of urinalysis and serum creatinine levels
  • Biopsy findings if performed

Coding Guidelines

Usage Guidelines & Examples

  • Follow ICD-10 guidelines for nephrotic syndrome coding.
  • Common errors include misclassifying the severity of kidney disease.

Code Exclusions

Important Exclusions

  • Secondary causes of nephrotic syndrome such as diabetes or lupus
  • ICD codes for other types of glomerulonephritis

Related ICD-10 Codes

Primary Codes
N04.9
Nephrotic syndrome, unspecified
N18.9
Chronic kidney disease, unspecified
Ancillary Codes
E11.22
Z14.8
Differential Codes
N04.0

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Nephrology

Specialty Applications

  • Adults and children with nephrotic syndrome
  • Outpatient nephrology clinics and inpatient settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Include detailed patient history, lab results, and any imaging or biopsy findings.

Billing considerations?

Ensure accurate coding of nephrotic syndrome and related conditions to avoid denials.