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Z90.5
ICD-10-CM
Acquired Absence of Kidney

Understanding Acquired Absence of Kidney (AAK), also known as post-nephrectomy status or unilateral nephrectomy? This guide covers clinical documentation and medical coding for AAK, offering insights for healthcare professionals on accurately recording this diagnosis in medical records. Learn about appropriate terminology and best practices for coding Acquired Absence of Kidney for optimal reimbursement and data analysis.

Also known as

Post-nephrectomy status
Unilateral nephrectomy

Diagnosis Snapshot

Key Facts
  • Definition : One kidney is congenitally missing or surgically removed.
  • Clinical Signs : Often asymptomatic. Reduced kidney function may be present if other kidney diseased.
  • Common Settings : Post-surgery, congenital anomaly detection, imaging studies.

Related ICD-10 Code Ranges

Complete code families applicable to AAPC Z90.5 Coding
Z90-Z99

Persons with potential health hazards related to socioeconomic and psychosocial circumstances

Covers acquired absence of organs, including kidney, due to surgery like nephrectomy.

N28

Other disorders of kidney and ureter

Includes other specified kidney conditions, potentially relevant to post-nephrectomy state.

Q60-Q64

Congenital malformations of the urinary system

While focused on congenital absence, may offer codes for comparison or complications with acquired absence.

Code-Specific Guidance

Decision Tree for

Follow this step-by-step guide to choose the correct ICD-10 code.

Is the absence of kidney acquired?

  • Yes

    Is it due to surgical removal?

  • No

    Do not code for acquired absence. Review documentation for appropriate code.

Code Comparison

Related Codes Comparison

When to use each related code

Description
One kidney absent after surgical removal.
Congenital absence of one or both kidneys.
Kidney function loss, not due to absence.

Documentation Best Practices

Documentation Checklist
  • Document nephrectomy date and side.
  • Specify cause of kidney absence.
  • Code Z90.81, Acquired absence of kidney.
  • If unilateral, code laterality (e.g., Z90.811).
  • Document impact on renal function.

Coding and Audit Risks

Common Risks
  • Laterality Coding

    Missing laterality (right, left, unspecified) for acquired absence of kidney can lead to inaccurate coding and reimbursement.

  • Cause of Absence

    Failure to code the underlying cause of kidney absence (e.g., nephrectomy) can impact data analysis and quality metrics.

  • Postoperative Complication

    Incorrectly coding postoperative complications related to the nephrectomy instead of the absent kidney can skew complication rates.

Mitigation Tips

Best Practices
  • Document nephrectomy type/date. Code Z90.81, N18.9
  • For post-nephrectomy, specify cause. Lateralize N18.9
  • Query provider to clarify AAK etiology for accurate coding
  • If kidney transplant, code Z94.0. Do not code AAK
  • Avoid unspecified codes. Use clinical indicators for specificity

Clinical Decision Support

Checklist
  • Verify nephrectomy surgical history (ICD-10-PCS 0BT)
  • Confirm absent kidney on imaging (SNOMED CT-127750004)
  • Document laterality (left or right) for coding accuracy
  • Check GFR and monitor for CKD progression (ICD-10-CM N18.9)

Reimbursement and Quality Metrics

Impact Summary
  • **Reimbursement:** Accurate coding for Acquired Absence of Kidney (ICD-10 N28.1) ensures appropriate reimbursement. Common coding errors with post-nephrectomy or unilateral nephrectomy impact revenue cycle.
  • **Quality Metrics:** Kidney-related diagnoses influence quality scores. Proper documentation of N28.1 ensures accurate reporting for performance measurement.
  • **Coding Accuracy:** Specifying acquired vs. congenital absence is crucial. Miscoding impacts data integrity and hospital reporting on kidney disease prevalence.
  • **Hospital Reporting:** Correct N28.1 coding facilitates accurate reporting for population health management and resource allocation for renal care.

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Frequently Asked Questions

Common Questions and Answers

Q: What are the long-term management considerations for patients with acquired absence of a kidney (unilateral nephrectomy)?

A: Long-term management of patients with acquired absence of a kidney, often referred to as post-nephrectomy status or unilateral nephrectomy, focuses on preserving the function of the remaining kidney and minimizing potential long-term complications. Key aspects include regular monitoring of blood pressure, glomerular filtration rate (GFR), and urine albumin-to-creatinine ratio. Controlling hypertension is crucial to prevent further renal damage. Lifestyle modifications such as dietary sodium restriction and regular exercise are recommended. Patients should also avoid nephrotoxic medications like NSAIDs when possible. Regular follow-up with a nephrologist is essential to assess renal function and adjust management strategies as needed. Consider implementing a standardized follow-up protocol for consistent monitoring and early intervention. Explore how our platform can help you streamline patient management for those with acquired absence of a kidney.

Q: How can I differentiate between congenital solitary kidney and acquired absence of a kidney (post-nephrectomy) in my differential diagnosis?

A: Differentiating between a congenital solitary kidney and acquired absence of a kidney (post-nephrectomy status) requires careful review of the patient's medical history, imaging studies, and physical exam. In cases of acquired absence, a history of nephrectomy will be documented, often with associated surgical scars. Imaging, particularly abdominal ultrasound or CT, will confirm the absence of one kidney and can provide insights into the cause of the nephrectomy (e.g., tumor, trauma, infection). Congenital solitary kidney, however, presents without a history of nephrectomy and imaging may reveal compensatory hypertrophy of the single kidney. Additionally, congenital anomalies in other organ systems may be present. Thorough history-taking and detailed imaging analysis are vital for accurate diagnosis. Learn more about our advanced imaging analysis tools that can help differentiate these conditions with precision.

Quick Tips

Practical Coding Tips
  • Code N45.8 for acquired absence
  • Document nephrectomy details
  • Consider Z90.5 after nephrectomy
  • Check laterality for coding
  • Query physician if unclear

Documentation Templates

Patient presents with acquired absence of the rightleft kidney, confirmed by imaging (CT abdomenpelvis) and consistent with past medical history of nephrectomy.  This post-nephrectomy status is secondary to  (indicate reason for nephrectomy, e.g., renal cell carcinoma, traumatic injury, chronic pyelonephritis, kidney donation).  Patient is currently (asymptomatic, symptomatic) with (describe symptoms if present, e.g., flank pain, hematuria, proteinuria).  Physical exam reveals (relevant findings, e.g., well-healed surgical scar, absence of palpable kidney).  Serum creatinine and estimated glomerular filtration rate (eGFR) are within (normal, abnormal) limits at (provide specific values).  Unilateral nephrectomy complications, such as hypertension or chronic kidney disease, are not currently evident.  Plan includes continued monitoring of renal function with periodic laboratory testing including serum creatinine, eGFR, and urinalysis.  Patient education provided regarding potential long-term implications of single kidney living, including lifestyle modifications for renal protection and signs and symptoms of renal insufficiency. Follow-up scheduled in (timeframe) to reassess renal function and overall health status.  ICD-10 code Z90.5 (acquired absence of kidney) is applicable.