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ICD-10 Guide
ICD-10 CodesChapter 14: Diseases of the genitourinary systemN10

N10

Billable

Acute pyelonephritis

Chapter 14:Diseases of the genitourinary system

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

Code Description

ICD-10 N10 is a billable code used to indicate a diagnosis of acute pyelonephritis.

Key Diagnostic Point:

Acute pyelonephritis is a sudden and severe kidney infection that primarily affects the renal pelvis and interstitium. It is often caused by ascending urinary tract infections (UTIs) where bacteria from the bladder travel up to the kidneys. Common pathogens include Escherichia coli and other gram-negative bacteria. Symptoms typically include fever, chills, flank pain, dysuria, and increased urinary frequency. Diagnosis is usually confirmed through urinalysis, urine culture, and imaging studies such as ultrasound or CT scan to assess for complications like hydronephrosis. Acute pyelonephritis can lead to serious complications if untreated, including renal abscesses or sepsis. Management typically involves prompt antibiotic therapy tailored to the identified pathogen, along with supportive care. In cases where obstruction is present, such as hydronephrosis, surgical intervention may be necessary. The condition can also be exacerbated by factors such as diabetes, pregnancy, or urinary tract anomalies.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between acute and chronic conditions
  • Identifying the underlying cause of the infection
  • Documenting associated conditions like hydronephrosis
  • Understanding antibiotic resistance patterns

Audit Risk Factors

  • Inadequate documentation of symptoms
  • Failure to specify the causative organism
  • Misclassification of acute versus chronic conditions
  • Lack of supporting imaging studies

Specialty Focus

Medical Specialties

Urology

Documentation Requirements

Detailed history of urinary symptoms, imaging results, and treatment plans.

Common Clinical Scenarios

Management of recurrent UTIs leading to pyelonephritis, post-surgical infections.

Billing Considerations

Need for clear documentation of any anatomical abnormalities or previous interventions.

Infectious Disease

Documentation Requirements

Comprehensive review of patient history, culture results, and antibiotic susceptibility.

Common Clinical Scenarios

Treatment of complicated pyelonephritis in immunocompromised patients.

Billing Considerations

Focus on identifying resistant organisms and tailoring antibiotic therapy.

Coding Guidelines

Inclusion Criteria

Use N10 When
  • Follow the official ICD
  • CM coding guidelines for specificity in documenting the diagnosis
  • Include any associated conditions such as hydronephrosis or urinary tract obstruction
  • Ensure that the documentation supports the diagnosis and treatment plan

Exclusion Criteria

Do NOT use N10 When
No specific exclusions found.

Related CPT Codes

CPT 99223CPT Code

Initial hospital care, high complexity

Clinical Scenario

Used for inpatient management of acute pyelonephritis.

Documentation Requirements

Comprehensive history, examination, and medical decision-making.

Specialty Considerations

Urology and Infectious Disease specialists should ensure detailed documentation of the patient's condition.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of acute pyelonephritis, improving data accuracy and facilitating better patient management through detailed documentation of associated conditions.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of acute pyelonephritis, improving data accuracy and facilitating better patient management through detailed documentation of associated conditions.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of acute pyelonephritis, improving data accuracy and facilitating better patient management through detailed documentation of associated conditions.

Resources

Clinical References

  • •
    CDC Guidelines for Urinary Tract Infections

Coding & Billing References

  • •
    CDC Guidelines for Urinary Tract Infections

Frequently Asked Questions

What are the common symptoms of acute pyelonephritis?

Common symptoms include fever, chills, flank pain, dysuria, and increased urinary frequency. Patients may also experience nausea and vomiting.