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v1.0.0
ICD-10 Guide
DiagnosesUreter Stone With Hydronephrosis

Ureter Stone With Hydronephrosis

ICD-10 Coding for Ureteral Stone with Hydronephrosis(N13.2, N13.6)

PRIMARY SPECIALTYEmergency Medicine
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Ureter Stone With Hydronephrosis?
Essential facts and insights about Ureteral Stone with Hydronephrosis

Key Clinical Considerations:

  • Severe flank pain, hematuria, nausea, vomiting
  • CT scan showing ureteral stone and hydronephrosis, ultrasound revealing renal swelling
  • Costovertebral angle tenderness, abdominal tenderness

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of renal stones, imaging results, treatment plan
  • ICD-10-CM: N20.0 (Calculus of kidney), N13.9 (Hydronephrosis, unspecified)
  • Example: 'Patient presents with acute flank pain and CT confirms ureter stone with hydronephrosis.'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for dual coding of conditions, avoid using unspecified codes when specific codes are available.
  • Common errors include misclassifying hydronephrosis severity.

Code Exclusions

Important Exclusions

  • Other causes of hydronephrosis (e.g., tumors), urethral stones

Related ICD-10 Codes

Primary Codes
N20.0
Calculus of kidney
N13.9
Hydronephrosis, unspecified
Ancillary Codes
N20.1
Differential Codes
N13.6
N13.2

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Emergency Medicine

Specialty Applications

  • Adults and children with renal stones, emergency department settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Include patient history, imaging results, and treatment details.

Billing considerations?

Ensure accurate coding to reflect both stone and hydronephrosis for proper reimbursement.