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ICD-10 Guide
DiagnosesHistory Of Nephrolithiasis

History Of Nephrolithiasis

ICD-10 Coding for History of Nephrolithiasis(Z87.442)

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

Diagnosis Overview

What is History Of Nephrolithiasis?
Essential facts and insights about History of Nephrolithiasis

Key Clinical Considerations:

  • History of kidney stones or nephrolithiasis episodes
  • Symptoms may include flank pain, hematuria, and urinary urgency
  • Physical exam may reveal costovertebral angle tenderness

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document previous episodes of nephrolithiasis and treatments
  • Use specific terminology such as 'calculus' or 'stone disease'
  • Examples include: 'Patient has a history of calcium oxalate stones treated with dietary modifications.'

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Use specific codes for types of stones when known.
  • Common errors: Failing to document the history or using unspecified codes.

Code Exclusions

Important Exclusions

  • Excluded conditions: Active nephrolithiasis without history.
  • Alternative codes: Use N21 for other urinary calculi.

Related ICD-10 Codes

Primary Codes
N20.0
Calculus of kidney
N20.1
Calculus of ureter
N20.9
Urinary calculus, unspecified
Ancillary Codes
Z09
Differential Codes
N20.0
N20.0
for active kidney stones, not for historical cases.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Urology

Specialty Applications

  • Patient populations: Individuals with recurrent urinary stones, those with metabolic disorders.
  • Clinical settings: Urology clinics, emergency departments, and outpatient 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 history of stone formation, treatments, and any complications.

Billing considerations?

Ensure accurate coding to reflect the history and any current symptoms.