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ICD-10 Guide
ICD-10 CodesN27.9

N27.9

Billable

Small kidney, unspecified

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

Code Description

ICD-10 N27.9 is a billable code used to indicate a diagnosis of small kidney, unspecified.

Key Diagnostic Point:

Small kidney, unspecified (ICD-10 code N27.9) refers to a condition characterized by a reduction in kidney size without a specified cause. This condition can arise from various underlying issues, including congenital anomalies, chronic ischemic nephropathy, or other kidney disorders that lead to renal atrophy. Patients may present with symptoms related to decreased renal function, such as hypertension, electrolyte imbalances, or signs of chronic kidney disease. The diagnosis often requires imaging studies, such as ultrasound or CT scans, to assess kidney size and structure. The unspecified nature of this code indicates that further investigation is needed to determine the exact etiology of the small kidney, which may include conditions like renal artery stenosis or chronic glomerulonephritis. Accurate coding is essential for appropriate management and treatment planning, as well as for tracking the prevalence of kidney disorders in the population. Clinicians must document any relevant history, physical examination findings, and diagnostic tests to support the use of this code.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Unspecified nature of the condition can lead to ambiguity in coding.
  • Requires thorough documentation to support diagnosis.
  • Potential overlap with other kidney disorders complicates coding.
  • Need for additional diagnostic tests to determine underlying causes.

Audit Risk Factors

  • Lack of detailed documentation supporting the diagnosis.
  • Inconsistent use of the code across different providers.
  • Failure to document associated symptoms or conditions.
  • Use of the code without appropriate imaging studies.

Specialty Focus

Medical Specialties

Nephrology

Documentation Requirements

Detailed history of kidney function, imaging results, and laboratory tests.

Common Clinical Scenarios

Patients with chronic kidney disease presenting with small kidneys on imaging.

Billing Considerations

Ensure that all relevant comorbidities are documented to support the diagnosis.

Urology

Documentation Requirements

Assessment of urinary symptoms, imaging studies, and any surgical history.

Common Clinical Scenarios

Evaluation of patients with renal masses or obstruction leading to kidney atrophy.

Billing Considerations

Document any interventions or treatments that may affect kidney size.

Coding Guidelines

Inclusion Criteria

Use N27.9 When
  • According to ICD
  • 10 coding guidelines, N27
  • 9 should be used when the condition of a small kidney is documented without a specified cause
  • It is important to ensure that the diagnosis is supported by clinical findings and imaging results

Exclusion Criteria

Do NOT use N27.9 When
  • Exclusion criteria include conditions that are more specifically classified under other codes

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 the reason for the ultrasound and findings related to kidney size.

Specialty Considerations

Nephrologists and urologists should ensure imaging results are included in the patient's medical record.

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 small kidney conditions. This has improved the ability to track and manage kidney health in populations, but it also requires more detailed documentation from providers.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of kidney disorders, including small kidney conditions. This has improved the ability to track and manage kidney health in populations, but it also requires more detailed documentation from providers.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of kidney disorders, including small kidney conditions. This has improved the ability to track and manage kidney health in populations, but it also requires more detailed documentation from providers.

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 should I document to support the use of N27.9?

You should document the patient's history, any symptoms related to kidney function, imaging results showing kidney size, and any laboratory tests that support the diagnosis.