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Z87.440
ICD-10-CM
History of Kidney Stones

Understanding the history of kidney stones is crucial for accurate diagnosis and treatment. This resource covers key aspects of documenting a patient's kidney stone history, including past stone analyses, renal colic episodes, family history of nephrolithiasis, relevant medical codes (ICD-10 N00, N20), and clinical terminology for healthcare professionals. Learn about risk factors, symptoms, and diagnostic procedures for effective clinical documentation and medical coding related to a history of kidney stones.

Also known as

History of Renal Calculi
Past Kidney Stones
Resolved Nephrolithiasis

Diagnosis Snapshot

Key Facts
  • Definition : Recurrent formation of solid mineral and salt deposits in the kidneys.
  • Clinical Signs : Severe flank pain, blood in urine, nausea, vomiting, urinary urgency.
  • Common Settings : Urology clinics, primary care offices, emergency rooms.

Related ICD-10 Code Ranges

Complete code families applicable to AAPC Z87.440 Coding
N75.89

Other specified calculus of kidney

History of kidney stones, unspecified type.

N75.0

Calculus of kidney

History of stone in the kidney.

N75.9

Calculus of kidney, unspecified

History of kidney stone without further details.

Z87.89

Personal history of other diseases

Past kidney stones affecting current healthcare.

Code-Specific Guidance

Decision Tree for

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

Personal history of kidney stones?

Code Comparison

Related Codes Comparison

When to use each related code

Description
Kidney stones
Nephrolithiasis
Renal colic

Documentation Best Practices

Documentation Checklist
  • Kidney stone type documented (calcium, uric acid, etc.)
  • Stone size and location if known (e.g., 8mm left ureter)
  • Hydronephrosis presence/absence and degree if present
  • Pain characteristics (onset, location, severity, radiation)
  • Prior stone history, treatments, and family history

Coding and Audit Risks

Common Risks
  • Unconfirmed Diagnosis

    Coding history of kidney stones without definitive documentation (e.g., imaging, lab results) can lead to inaccurate coding and denials.

  • Specificity Lacking

    Insufficient documentation of stone type (e.g., calcium, struvite) or location may hinder accurate code assignment and reimbursement.

  • Symptom Coding

    Coding symptoms (e.g., renal colic) instead of the confirmed diagnosis of history of kidney stones can cause undercoding and lost revenue.

Mitigation Tips

Best Practices
  • Document stone type, size, location for accurate ICD-10 coding (N20.x).
  • Capture laterality, episode acuteness, obstruction details for CDI, HCC risk adjustment.
  • Query physician for stone composition if unknown to ensure specific coding.
  • Ensure documentation links past stone treatments to current episode for medical necessity.
  • Regularly audit kidney stone documentation against coding guidelines for compliance.

Clinical Decision Support

Checklist
  • Verify documented pain consistent with renal colic.
  • Check UA for hematuria, crystals, or infection.
  • Confirm imaging (CT, ultrasound) supports stone diagnosis.
  • Review past medical history for prior stones or risk factors.

Reimbursement and Quality Metrics

Impact Summary
  • Kidney Stones Diagnosis Reimbursement and Quality Metrics Impact Summary
  • ICD-10-CM N20.0-N20.9 impacts MS-DRG assignment and reimbursement.
  • Accurate coding affects APR-DRG severity and comorbidity risk adjustment.
  • History of kidney stones influences quality measures for chronic kidney disease.
  • Coding specificity improves hospital data analytics and reporting accuracy.

Streamline Your Medical Coding

Let S10.AI help you select the most accurate ICD-10 codes. Our AI-powered assistant ensures compliance and reduces coding errors.

Quick Tips

Practical Coding Tips
  • Code N20.0 for calculus of kidney
  • Document stone type/location
  • Laterality crucial for coding
  • Check for obstruction/infection
  • Consider history of nephrectomy

Documentation Templates

Patient presents with a history of nephrolithiasis (kidney stones).  The patient reports past episodes of renal colic, characterized by severe flank pain radiating to the groin, often accompanied by nausea, vomiting, and hematuria.  Prior stone analysis revealed calcium oxalate composition.  The patient's medical history includes hypercalciuria and dehydration.  Family history is positive for kidney stones.  Physical examination reveals no costovertebral angle tenderness currently.  Urinalysis shows no evidence of infection.  Assessment:  Recurrent nephrolithiasis, likely calcium oxalate type.  Plan:  Encourage increased fluid intake to promote stone passage.  Recommend dietary modifications to reduce oxalate and calcium intake.  Prescribe pain management as needed with NSAIDs or opioids if severe.  Refer to urology for further evaluation and consideration for metabolic workup to identify underlying causes of stone formation, including 24-hour urine collection for calcium, oxalate, citrate, and uric acid.  Patient education provided regarding prevention strategies for kidney stones, including hydration, dietary changes, and medication compliance. Follow-up scheduled in two weeks to monitor symptoms and progress.