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ICD-10 Guide
ICD-10 CodesN27.1

N27.1

Billable

Small kidney, bilateral

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

Code Description

ICD-10 N27.1 is a billable code used to indicate a diagnosis of small kidney, bilateral.

Key Diagnostic Point:

Bilateral small kidneys, or renal hypoplasia, is a condition characterized by the underdevelopment of both kidneys, leading to a reduction in kidney size and function. This condition can be congenital or acquired, often associated with ischemic nephropathy, where blood flow to the kidneys is compromised, resulting in tissue damage and impaired renal function. Patients may present with symptoms of chronic kidney disease, including fatigue, fluid retention, and electrolyte imbalances. Diagnosis typically involves imaging studies such as ultrasound or CT scans, which reveal the size and structure of the kidneys. Management may include monitoring renal function, controlling blood pressure, and addressing any underlying causes. In severe cases, patients may require renal replacement therapy. Accurate coding is essential for proper treatment planning and reimbursement, as well as for tracking the prevalence of kidney disorders in the population.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between congenital and acquired causes
  • Potential overlap with other kidney disorders
  • Need for detailed documentation of renal function
  • Variability in clinical presentation

Audit Risk Factors

  • Inadequate documentation of kidney size and function
  • Failure to specify bilateral involvement
  • Misclassification with other renal disorders
  • Lack of evidence for ischemic nephropathy

Specialty Focus

Medical Specialties

Nephrology

Documentation Requirements

Detailed renal function tests, imaging results, and patient history.

Common Clinical Scenarios

Patients with chronic kidney disease, hypertension, or electrolyte imbalances.

Billing Considerations

Ensure documentation reflects the bilateral nature and any associated complications.

Urology

Documentation Requirements

Surgical notes, imaging studies, and pathology reports if applicable.

Common Clinical Scenarios

Patients undergoing evaluation for renal masses or obstructive uropathy.

Billing Considerations

Document any surgical interventions or findings that may impact renal size.

Coding Guidelines

Inclusion Criteria

Use N27.1 When
  • According to ICD
  • 10 guidelines, N27
  • 1 should be used when there is clear documentation of bilateral small kidneys
  • Documentation must support the diagnosis, including imaging and laboratory results

Exclusion Criteria

Do NOT use N27.1 When
  • It is important to exclude other specified conditions that may affect kidney size and function

Related ICD-10 Codes

Related CPT Codes

76700CPT Code

Ultrasound, abdomen, complete

Clinical Scenario

Used to evaluate kidney size and structure in patients suspected of having small kidneys.

Documentation Requirements

Document indications for ultrasound and findings related to kidney size.

Specialty Considerations

Nephrologists and urologists should ensure imaging correlates with clinical findings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of kidney disorders, including bilateral small kidneys, which enhances the ability to track and manage these conditions effectively. It has improved the granularity of data for research and quality improvement initiatives.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of kidney disorders, including bilateral small kidneys, which enhances the ability to track and manage these conditions effectively. It has improved the granularity of data for research and quality improvement initiatives.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of kidney disorders, including bilateral small kidneys, which enhances the ability to track and manage these conditions effectively. It has improved the granularity of data for research and quality improvement initiatives.

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

What are the common causes of bilateral small kidneys?

Common causes include congenital anomalies, chronic ischemic conditions, and systemic diseases that affect renal blood flow.