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ICD-10 Guide
DiagnosesEmphysematous Pyelonephritis

Emphysematous Pyelonephritis

ICD-10 Coding for Emphysematous Pyelonephritis(N10, A41.51)

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

Diagnosis Overview

What is Emphysematous Pyelonephritis?
Essential facts and insights about Emphysematous Pyelonephritis

Key Clinical Considerations:

  • Flank pain, fever, chills, nausea, vomiting
  • CT scan showing gas in renal parenchyma or perinephric space
  • Tenderness in the flank area, possible abdominal distension

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including symptoms and duration, imaging results, laboratory findings
  • ICD-10-CM terminology: Emphysematous pyelonephritis, renal abscess
  • Example: 'Patient presents with fever and flank pain; CT shows gas formation in the right kidney.'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding complications; avoid miscoding with simple pyelonephritis.
  • Common errors include using incorrect codes for non-emphysematous conditions.

Code Exclusions

Important Exclusions

  • Non-emphysematous pyelonephritis, renal cell carcinoma
  • N20.0 (Calculus of kidney)

Related ICD-10 Codes

Primary Codes
N28.1
Emphysematous pyelonephritis
Ancillary Codes
B96.2
E11.9
R65.21
Differential Codes
N11
A41.9
A41.51
when E. coli is confirmed as the causative organism.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Nephrology

Specialty Applications

  • Diabetic patients, immunocompromised individuals
  • Emergency departments, inpatient 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?

Document all clinical findings, imaging results, and treatment plans.

Billing considerations?

Ensure accurate coding to reflect severity and complexity for reimbursement.