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v1.0.0
ICD-10 Guide
ICD-10 CodesN18.4

N18.4

Billable

Chronic kidney disease, stage 4 (severe)

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

Code Description

ICD-10 N18.4 is a billable code used to indicate a diagnosis of chronic kidney disease, stage 4 (severe).

Key Diagnostic Point:

Chronic kidney disease (CKD) stage 4 is characterized by a significant reduction in kidney function, with an estimated glomerular filtration rate (eGFR) of 15 to 29 mL/min. Patients at this stage often experience symptoms such as fatigue, fluid retention, and electrolyte imbalances. The kidneys are severely impaired, leading to the accumulation of waste products in the blood, which can result in complications such as anemia, bone disease, and cardiovascular issues. Management typically involves close monitoring, dietary modifications, and preparation for renal replacement therapy, which may include dialysis or kidney transplantation. Patients may also require management of comorbid conditions such as hypertension and diabetes, which can exacerbate kidney damage. The transition to stage 5, or end-stage renal disease (ESRD), is a critical concern, necessitating timely intervention to prevent further deterioration of kidney function.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Need for accurate staging of CKD based on eGFR
  • Management of comorbid conditions complicating CKD
  • Documentation of symptoms and complications
  • Differentiation from acute kidney injury (AKI)

Audit Risk Factors

  • Inadequate documentation of eGFR levels
  • Failure to document comorbid conditions
  • Misclassification of CKD stage
  • Lack of evidence for renal replacement therapy discussions

Specialty Focus

Medical Specialties

Nephrology

Documentation Requirements

Detailed documentation of kidney function tests, comorbidities, and treatment plans.

Common Clinical Scenarios

Patients presenting with worsening renal function, requiring dialysis initiation or transplant evaluation.

Billing Considerations

Ensure accurate staging of CKD and documentation of all relevant lab results.

Primary Care

Documentation Requirements

Regular monitoring of kidney function and management of associated chronic conditions.

Common Clinical Scenarios

Routine follow-up of patients with known CKD, managing hypertension and diabetes.

Billing Considerations

Document all referrals to specialists and any changes in treatment plans.

Coding Guidelines

Inclusion Criteria

Use N18.4 When
  • Follow official coding guidelines for CKD, ensuring accurate documentation of eGFR and staging
  • Include any relevant complications and comorbidities in the coding process

Exclusion Criteria

Do NOT use N18.4 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

90935CPT Code

Hemodialysis procedure

Clinical Scenario

Used for patients with CKD stage 4 requiring dialysis.

Documentation Requirements

Document the need for dialysis and any complications.

Specialty Considerations

Nephrology specialists should ensure accurate documentation of dialysis sessions.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of CKD stages, improving the accuracy of patient records and facilitating better management strategies.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of CKD stages, improving the accuracy of patient records and facilitating better management strategies.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of CKD stages, improving the accuracy of patient records and facilitating better management strategies.

Resources

Clinical References

  • •
    Kidney Disease: Improving Global Outcomes (KDIGO)

Coding & Billing References

  • •
    Kidney Disease: Improving Global Outcomes (KDIGO)

Frequently Asked Questions

What is the significance of CKD stage 4?

CKD stage 4 indicates severe kidney impairment, requiring careful management to prevent progression to end-stage renal disease and potential need for dialysis or transplant.