ICD-10 Guide

Left Lower Lobe Pneumonia

ICD-10 Coding for Left Lower Lobe Pneumonia(J18.9, J15.5)

PRIMARY SPECIALTYPulmonology

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Left Lower Lobe Pneumonia?

Essential facts and insights about Left Lower Lobe Pneumonia

Key Clinical Considerations:

Cough, fever, chills, dyspnea, pleuritic chest pain
Chest X-ray showing left lower lobe consolidation, CT scan findings
Decreased breath sounds, dullness to percussion, crackles on auscultation

Clinical Information

Clinical Criteria & Documentation Requirements

Patient history, physical exam findings, imaging results, treatment plan
ICD-10-CM terminology: J18.1 for left lower lobe pneumonia
Example: 'Patient presents with fever and cough; chest X-ray confirms left lower lobe pneumonia.'

Coding Guidelines

Usage Guidelines & Examples

Follow guidelines for pneumonia coding; avoid unspecified codes when possible.
Common errors include misclassifying pneumonia type or neglecting to document severity.

Code Exclusions

Important Exclusions

Aspiration pneumonia, viral pneumonia, chronic obstructive pulmonary disease exacerbation
J18.0 (Lobar pneumonia, unspecified, right lobe)

Specialty Focus

Primary Specialty

Pulmonology

Specialty Applications

Adults and children with respiratory symptoms; inpatient and outpatient 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, symptoms, imaging results, and treatment.

Billing considerations?

Ensure accurate coding and documentation to support medical necessity.

Left Lower Lobe Pneumonia

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

Documentation requirements?

Billing considerations?

Left Lower Lobe Pneumonia

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

Documentation requirements?

Billing considerations?