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v1.0.0
ICD-10 Guide
DiagnosesGram Negative Bacteria

Gram Negative Bacteria

ICD-10 Coding for Gram-negative bacterial infections(A41.5, A41.50)

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

Diagnosis Overview

What is Gram Negative Bacteria?
Essential facts and insights about Gram-negative bacterial infections

Key Clinical Considerations:

  • Fever, chills, tachycardia, hypotension
  • Blood cultures positive for Gram-negative organisms, elevated white blood cell count
  • Tachypnea, altered mental status, abdominal tenderness

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of infection, antibiotic treatment history, clinical signs
  • ICD-10-CM codes for Gram-negative infections, sepsis, and related conditions
  • Examples: 'Patient diagnosed with E. coli bacteremia' or 'Sepsis due to Klebsiella pneumoniae'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for sepsis coding, avoid unspecified codes when possible
  • Common errors include using outdated codes or omitting organism identification

Code Exclusions

Important Exclusions

  • Gram-positive infections, viral infections
  • Codes for non-infectious conditions

Related ICD-10 Codes

Primary Codes
A41.9
Sepsis, unspecified organism
A49.9
Bacterial infection, unspecified
N39.0
Urinary tract infection, site not specified
Ancillary Codes
B96.2
R78.81
Differential Codes
A41.9
A41.9
when the organism causing sepsis is not identified or documented.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Critical Care

Specialty Applications

  • Critically ill patients, immunocompromised individuals
  • ICU, 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 specific organism, clinical presentation, and treatment response.

Billing considerations?

Ensure accurate coding to reflect severity and specificity for reimbursement.