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Z87.440
ICD-10-CM
History of Nephrolithiasis

Find information on documenting a history of nephrolithiasis for accurate medical coding and clinical documentation. Learn about relevant ICD-10 codes, past medical history documentation, kidney stone disease history, renal calculi, nephrolithiasis diagnosis, and best practices for healthcare professionals. This resource provides guidance on capturing complete patient history related to nephrolithiasis for optimal patient care and accurate billing.

Also known as

History of Kidney Stones
Personal History of Urinary Calculi

Diagnosis Snapshot

Key Facts
  • Definition : History of kidney stone formation.
  • Clinical Signs : Flank pain, hematuria, nausea, vomiting, urinary urgency.
  • Common Settings : Primary care, urgent care, emergency room, urology clinic.

Related ICD-10 Code Ranges

Complete code families applicable to AAPC Z87.440 Coding
N20-N23

Calculus of kidney and ureter

Covers kidney and ureter stones, including history.

Z85-Z99

Personal history of medical conditions

Includes history of various medical issues, potentially relevant.

N28-N29

Other disorders of kidney and ureter

May include residual effects or complications related to past stones.

Code-Specific Guidance

Decision Tree for

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

Is the nephrolithiasis currently active?

  • Yes

    Do NOT code history of nephrolithiasis. Code the active condition (e.g., N20.0, N20.1).

  • No

    Any documented residual effects?

Code Comparison

Related Codes Comparison

When to use each related code

Description
History of kidney stones
Renal colic
Nephrocalcinosis

Documentation Best Practices

Documentation Checklist
  • Document stone type if known (calcium, uric acid, etc.)
  • Laterality (left, right, bilateral nephrolithiasis)
  • Location (e.g., kidney, ureter)
  • History of nephritic colic or flank pain
  • Document any prior treatments or interventions

Coding and Audit Risks

Common Risks
  • Unspecified Laterality

    Coding for nephrolithiasis requires specifying laterality (right, left, bilateral) when documented. Unspecified laterality leads to coding errors.

  • Missing Obstruction Code

    If obstruction is present with the history of nephrolithiasis, it requires a separate code. Failing to code obstruction impacts reimbursement and data accuracy.

  • Conflicting Documentation

    Discrepancies between physician notes and diagnostic reports regarding nephrolithiasis history create coding ambiguity and potential compliance issues.

Mitigation Tips

Best Practices
  • Document stone type, size, location for accurate ICD-10 coding (N20.x).
  • Capture laterality (left/right/bilateral) for improved CDI & reimbursement.
  • Query provider for stone composition if unspecified in the medical record.
  • Detail prior treatments (lithotripsy, surgery) for accurate HCC coding.
  • Ensure documentation supports medical necessity for diagnostic testing.

Clinical Decision Support

Checklist
  • Verify documented evidence of past kidney stone event(s).
  • Confirm laterality (left, right, bilateral) if applicable.
  • Check imaging reports (e.g., CT, KUB) for stone confirmation.
  • Review UA for hematuria, crystals or prior stone analysis.

Reimbursement and Quality Metrics

Impact Summary
  • Nephrolithiasis coding accuracy impacts reimbursement for E/M, imaging, and procedures.
  • History of nephrolithiasis diagnosis affects quality metrics related to renal disease management.
  • Proper ICD-10 coding (N20.0, N20.9, Z87.0) for history of nephrolithiasis is crucial for accurate hospital reporting.
  • Accurate nephrolithiasis documentation impacts physician quality reporting system (PQRS) measures and value-based care.

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/size
  • Laterality impacts coding
  • Check for obstruction (N13.x)
  • Consider underlying cause

Documentation Templates

Patient presents with a history of nephrolithiasis, also known as kidney stones.  The patient reports past episodes of renal colic, characterized by severe flank pain, often radiating to the groin or lower abdomen.  Previous stone analysis, if available, indicated (insert stone composition, e.g., calcium oxalate, uric acid, struvite).  Review of systems reveals (positive/negative) hematuria, dysuria, and urinary frequency.  The patient denies fever, chills, or nausea suggesting no current infection.  Physical exam reveals (tenderness/no tenderness) in the costovertebral angle.  Assessment includes history of kidney stones with (mention current status e.g., recurrent symptoms, asymptomatic follow-up).  Plan includes (mention diagnostic tests if ordered, e.g., urinalysis, kidney ultrasound, CT scan without contrast) to evaluate for current stone presence and assess renal function.  Patient education provided on dietary modifications (e.g., increased fluid intake, low-sodium diet), depending on stone composition, to prevent recurrence.  Medical coding will consider ICD-10 code N20.0 (Calculus of kidney) and relevant CPT codes for diagnostic testing and procedures.  Follow-up scheduled to review diagnostic results and discuss management options, which may include medical expulsive therapy, lithotripsy, or other surgical interventions if indicated.
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