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ICD-10 Guide
DiagnosesAcute Chronic Renal Failure

Acute Chronic Renal Failure

ICD-10 Coding for Acute-on-Chronic Renal Failure(N17.9, N18.3)

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

Diagnosis Overview

What is Acute Chronic Renal Failure?
Essential facts and insights about Acute-on-Chronic Renal Failure

Key Clinical Considerations:

  • Patients may present with symptoms such as fatigue, edema, hypertension, and changes in urine output.
  • Laboratory findings may include elevated serum creatinine levels, decreased glomerular filtration rate (GFR), and electrolyte imbalances.
  • Physical examination may reveal signs of fluid overload, such as peripheral edema, pulmonary congestion, or hypertension.
  • Imaging studies like ultrasound may show kidney size, structural abnormalities, or obstruction.
  • Severity criteria include staging based on GFR levels, with acute-on-chronic renal failure typically indicating a sudden worsening of chronic kidney disease.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the patient's history of chronic kidney disease and any acute changes in renal function.
  • Specific terminology such as 'acute-on-chronic renal failure' must be used to ensure clarity in diagnosis.
  • Examples include documenting the patient's baseline renal function and any acute events leading to deterioration.
  • Medical necessity must be established through documentation of symptoms, lab results, and treatment plans.
  • Quality measures may require documentation of GFR, urine output, and management strategies.

Coding Guidelines

Usage Guidelines & Examples

  • Use this diagnosis code when a patient with chronic kidney disease experiences an acute decline in renal function.
  • Do not use this code for patients with only acute renal failure without a history of chronic kidney disease.
  • Similar codes include N17.9 (Acute kidney failure, unspecified) and N18.3 (Chronic kidney disease stage 3).
  • Common coding errors include misclassifying acute renal failure as acute-on-chronic without proper documentation.
  • In complex cases, ensure to document both the acute and chronic components clearly to support code selection.

Code Exclusions

Important Exclusions

  • Conditions explicitly excluded include acute renal failure without chronic kidney disease history.
  • Alternative codes for excluded conditions may include N17.0 for acute tubular necrosis.
  • Conditions are excluded to ensure accurate representation of the patient's renal status and avoid misdiagnosis.
  • Common exclusion mistakes include failing to document the chronic component when coding acute-on-chronic renal failure.
  • Related but distinct conditions include chronic kidney disease without acute exacerbation.

Related ICD-10 Codes

Primary Codes
N17.9
Acute kidney failure, unspecified
N18.3
Chronic kidney disease stage 3
Ancillary Codes
Z99.2
Differential Codes
N17.0
N18.4

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Nephrology

Specialty Applications

  • This applies to patients with a known history of chronic kidney disease who present with acute renal failure.
  • Patient populations include adults and elderly individuals, particularly those with comorbidities like diabetes or hypertension.
  • Clinical settings include inpatient hospital admissions, outpatient nephrology clinics, and emergency departments.
  • Specialty-specific applications are relevant in nephrology, critical care, and internal medicine.
  • Treatment contexts include management of fluid overload, electrolyte imbalances, and initiation of dialysis if necessary.

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

Template 1

Template: 'Patient diagnosed with acute-on-chronic renal failure based on elevated creatinine levels and history of CKD.'

Template 2

Template: 'Clinical presentation consistent with acute-on-chronic renal failure including fatigue and edema.'

Template 3

Template: 'Diagnostic criteria met as evidenced by GFR decline and acute symptoms.'

Template 4

Template: 'Treatment plan initiated for acute-on-chronic renal failure with fluid management and electrolyte monitoring.'

Template 5

Template: 'Follow-up care for acute-on-chronic renal failure including regular renal function tests and symptom assessment.'

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

What documentation is required for this diagnosis?

Documentation must include history of chronic kidney disease, acute changes in renal function, and relevant lab results.

How does this differ from similar diagnoses?

Acute-on-chronic renal failure indicates a sudden decline in renal function in a patient with pre-existing chronic kidney disease.

What are common billing considerations?

Ensure accurate coding to reflect the complexity of the patient's condition for appropriate reimbursement.

What procedures are typically associated?

Related CPT codes may include dialysis procedures and laboratory tests for renal function assessment.

Are there any quality reporting implications?

Quality measures may include monitoring GFR and managing complications associated with renal failure.