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ICD-10 Guide
ICD-10 CodesChapter 14: Diseases of the genitourinary systemN22

N22

Billable

Calculus of urinary tract in diseases classified elsewhere

Chapter 14:Diseases of the genitourinary system

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

Code Description

ICD-10 N22 is a billable code used to indicate a diagnosis of calculus of urinary tract in diseases classified elsewhere.

Key Diagnostic Point:

N22 refers to the presence of urinary tract calculi, or stones, that are secondary to other underlying diseases. These stones can form in the kidneys (nephrolithiasis), ureters (ureterolithiasis), or bladder, and are often composed of calcium, uric acid, or struvite. Patients may present with symptoms such as flank pain, hematuria, and urinary obstruction. The formation of these calculi can be influenced by various factors including metabolic disorders, dehydration, and dietary habits. Treatment options may include lithotripsy, which uses shock waves to break up stones, or surgical removal in cases of larger stones or complications. Dietary modifications, such as increased fluid intake and dietary adjustments to reduce oxalate or purine intake, are often recommended to prevent recurrence. Accurate coding requires understanding the underlying disease causing the stone formation, as N22 is specifically used when the calculus is a manifestation of another condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Requires knowledge of underlying diseases that lead to stone formation.
  • Differentiation between types of urinary calculi (e.g., calcium vs. uric acid).
  • Understanding of treatment modalities and their documentation.
  • Need for precise documentation of symptoms and clinical findings.

Audit Risk Factors

  • Inadequate documentation of the underlying disease.
  • Failure to specify the type of calculus.
  • Lack of clarity in treatment documentation.
  • Misalignment between diagnosis and procedure codes.

Specialty Focus

Medical Specialties

Urology

Documentation Requirements

Detailed patient history, imaging results, and treatment plans.

Common Clinical Scenarios

Patients presenting with renal colic, recurrent urinary tract infections, or obstructive uropathy due to stones.

Billing Considerations

Ensure documentation reflects the relationship between the underlying condition and stone formation.

Nephrology

Documentation Requirements

Comprehensive metabolic evaluation and management plans.

Common Clinical Scenarios

Patients with chronic kidney disease and stone formation due to metabolic disorders.

Billing Considerations

Document metabolic evaluations and dietary recommendations clearly.

Coding Guidelines

Inclusion Criteria

Use N22 When
  • According to ICD
  • 10 guidelines, N22 should be used when the calculus is a complication of another disease
  • Coders must ensure that the underlying condition is documented and coded appropriately

Exclusion Criteria

Do NOT use N22 When
  • Exclusion criteria include cases where the calculus is not related to another disease

Related CPT Codes

50590CPT Code

Lithotripsy, extracorporeal shock wave

Clinical Scenario

Used for patients with calculi requiring non-invasive treatment.

Documentation Requirements

Document indication for lithotripsy and imaging results.

Specialty Considerations

Urology specialists must ensure proper coding of the procedure based on the type of calculus.

52332CPT Code

Cystolitholapaxy

Clinical Scenario

Used for surgical removal of bladder stones.

Documentation Requirements

Document the type of stones and any complications.

Specialty Considerations

Urologists should provide detailed operative notes.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of urinary tract calculi, enabling better tracking of conditions and treatment outcomes. N22 provides a mechanism to capture the complexity of calculi related to other diseases, improving data accuracy for epidemiological studies and treatment protocols.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of urinary tract calculi, enabling better tracking of conditions and treatment outcomes. N22 provides a mechanism to capture the complexity of calculi related to other diseases, improving data accuracy for epidemiological studies and treatment protocols.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

When should I use N22 instead of N20?

Use N22 when the urinary tract calculus is a complication of another disease, while N20 should be used for calculi that are not associated with other conditions.