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ICD-10 Guide
DiagnosesAcute Renal Disease

Acute Renal Disease

ICD-10 Coding for Acute Renal Disease(N17.9, N17.1)

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

Diagnosis Overview

What is Acute Renal Disease?
Essential facts and insights about Acute Renal Disease

Key Clinical Considerations:

  • Acute renal disease is characterized by a rapid decline in kidney function, typically defined as an increase in serum creatinine levels by 0.3 mg/dL or more within 48 hours, or an increase of 1.5 times the baseline creatinine within the prior 7 days.
  • Laboratory findings may include elevated serum creatinine, blood urea nitrogen (BUN), and electrolyte imbalances such as hyperkalemia.
  • Physical examination may reveal signs of fluid overload, such as edema, hypertension, or altered mental status due to uremia.
  • Imaging studies, such as ultrasound, may show renal enlargement or obstruction, while CT scans can help identify underlying causes like nephrolithiasis or tumors.
  • Severity criteria include staging based on the Kidney Disease: Improving Global Outcomes (KDIGO) classification, which categorizes acute kidney injury into stages based on serum creatinine and urine output.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the onset of symptoms, laboratory results, and any interventions or treatments provided.
  • Specific terminology such as 'acute kidney injury' (AKI) or 'acute renal failure' should be used consistently in documentation.
  • Examples include noting the exact serum creatinine levels, urine output measurements, and any relevant comorbid conditions.
  • Documentation must demonstrate medical necessity for tests and treatments, including rationale for hospitalization if applicable.
  • Quality measures may require tracking of serum creatinine levels and urine output in patients diagnosed with acute renal disease.

Coding Guidelines

Usage Guidelines & Examples

  • Use N17.9 for unspecified acute renal failure when the specific cause is not documented, and N17.1 for acute tubular necrosis when the etiology is known.
  • Do not use these codes for chronic kidney disease or acute-on-chronic kidney disease scenarios; instead, use appropriate chronic codes.
  • Related codes include N17.2 for acute kidney failure due to tubular necrosis and N17.3 for acute kidney failure due to obstruction.
  • Common errors include misclassifying acute renal disease as chronic or failing to document the cause of acute renal failure.
  • In complex cases, ensure to document the underlying cause and any contributing factors to select the most accurate code.

Code Exclusions

Important Exclusions

  • Excludes chronic kidney disease (N18) and end-stage renal disease (N18.6), which require different coding.
  • Alternative codes for excluded conditions include N17.0 for prerenal acute kidney failure and N17.2 for acute tubular necrosis.
  • Conditions are excluded to ensure accurate representation of the patient's current health status and to avoid misdiagnosis.
  • Common mistakes include coding acute renal failure when chronic conditions are present without proper documentation.
  • Related but distinct conditions include acute interstitial nephritis (N10) and acute glomerulonephritis (N00-N08).

Related ICD-10 Codes

Primary Codes
N17.9
Acute kidney failure, unspecified
N17.1
Acute tubular necrosis
Ancillary Codes
E86.0
Differential Codes
N18.9
N17.2

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Nephrology

Specialty Applications

  • This diagnosis applies to patients experiencing sudden kidney function decline due to various causes, including dehydration, nephrotoxins, or obstruction.
  • Patient populations include all ages, with higher risk in elderly patients and those with pre-existing kidney conditions.
  • Clinical settings include inpatient hospital admissions, outpatient nephrology clinics, and emergency departments.
  • Specialty-specific applications are relevant in nephrology, critical care, and emergency medicine.
  • Treatment contexts include management of acute kidney injury, initiation of dialysis, and monitoring of renal function.

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 renal disease based on elevated serum creatinine levels and oliguria.'

Template 2

Template: 'Clinical presentation consistent with acute kidney injury including sudden onset of edema and hypertension.'

Template 3

Template: 'Diagnostic criteria met as evidenced by serum creatinine increase of 0.5 mg/dL within 24 hours.'

Template 4

Template: 'Treatment plan initiated for acute renal failure with fluid resuscitation and monitoring of electrolytes.'

Template 5

Template: 'Follow-up care for acute kidney injury including regular serum creatinine checks and urine output monitoring.'

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 clinical findings, laboratory results, and treatment plans.

How does this differ from similar diagnoses?

Acute renal disease is characterized by a rapid decline in function, unlike chronic conditions which are gradual.

What are common billing considerations?

Ensure that all services provided are medically necessary and properly documented to optimize claims.

What procedures are typically associated?

Commonly associated procedures include dialysis, renal ultrasound, and kidney biopsy.

Are there any quality reporting implications?

Quality measures may include tracking serum creatinine levels and patient outcomes related to acute renal disease.