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v1.0.0
ICD-10 Guide
DiagnosesInterstitial Lung Disease

Interstitial Lung Disease

ICD-10 Coding for Interstitial Lung Disease(J84.112, J70.4)

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

Diagnosis Overview

What is Interstitial Lung Disease?
Essential facts and insights about Interstitial Lung Disease

Key Clinical Considerations:

  • Dyspnea on exertion
  • Chronic cough
  • Fatigue
  • Key diagnostic tests: High-resolution CT scan showing ground-glass opacities, reticular patterns
  • Pulmonary function tests showing restrictive pattern
  • Physical exam findings: Inspiratory crackles, clubbing of fingers

Clinical Information

Clinical Criteria & Documentation Requirements

  • Required documentation elements: Patient history, symptom duration, diagnostic test results
  • Specific coding terminology: Interstitial lung disease, pulmonary fibrosis, hypersensitivity pneumonitis
  • Documentation examples: 'Patient presents with progressive dyspnea and a history of exposure to environmental allergens.'

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Use specific codes for different types of interstitial lung disease.
  • Common errors: Misclassifying interstitial lung disease as COPD or other respiratory conditions.

Code Exclusions

Important Exclusions

  • Excluded conditions: Asthma, COPD, and other obstructive lung diseases.
  • Alternative codes: Consider using codes for specific types of interstitial lung disease when applicable.

Related ICD-10 Codes

Primary Codes
J84.10
Interstitial lung disease, unspecified
J84.112
Pulmonary fibrosis due to autoimmune disease
J84.19
Other interstitial lung diseases
Ancillary Codes
Z87.010
T45.1X5A
Differential Codes
J84.1
J84.1
when specific fibrosis type is identified but not idiopathic.
J84.112
J84.112
when no drug cause is identified.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Pulmonology

Specialty Applications

  • Patient populations: Adults, particularly those with occupational exposures or autoimmune diseases.
  • Clinical settings: Pulmonology clinics, hospitals, and specialty respiratory care centers.

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 detailed patient history, diagnostic imaging results, and symptom assessment.

Billing considerations?

Ensure accurate coding to reflect the specific type of interstitial lung disease for proper reimbursement.