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v1.0.0
ICD-10 Guide
DiagnosesLung Adenocarcinoma

Lung Adenocarcinoma

ICD-10 Coding for Lung Adenocarcinoma(C34.1, C34.2)

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

Diagnosis Overview

What is Lung Adenocarcinoma?
Essential facts and insights about Lung Adenocarcinoma

Key Clinical Considerations:

  • Persistent cough, chest pain, weight loss, and hemoptysis
  • CT scan showing lung nodules, biopsy confirming adenocarcinoma
  • Dullness on percussion, decreased breath sounds, and wheezing

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history, physical exam findings, imaging results, and biopsy reports
  • ICD-10-CM codes for lung adenocarcinoma, specific histological type
  • Example: 'Patient diagnosed with lung adenocarcinoma, non-small cell type, stage IIIB'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding lung cancer stages, avoid unspecified codes
  • Common errors include using outdated codes or misclassifying tumor types

Code Exclusions

Important Exclusions

  • Small cell lung carcinoma, benign lung tumors
  • C34.0 (Malignant neoplasm of main bronchus)

Related ICD-10 Codes

Primary Codes
C34.9
Malignant neoplasm of unspecified part of bronchus or lung
C34.1
Malignant neoplasm of upper lobe, bronchus or lung
Ancillary Codes
C78.01
C79.51
Differential Codes
C34.9
C34.3

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Oncology

Specialty Applications

  • Adults, particularly smokers or those with a history of lung disease
  • Oncology clinics, hospitals, 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?

Complete patient history, imaging, and pathology reports are required.

Billing considerations?

Ensure accurate coding to reflect the specific type and stage of adenocarcinoma.