ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesC34.30

C34.30

Billable

Malignant neoplasm of lower lobe, unspecified bronchus or lung

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 C34.30 is a billable code used to indicate a diagnosis of malignant neoplasm of lower lobe, unspecified bronchus or lung.

Key Diagnostic Point:

C34.30 refers to a malignant neoplasm located in the lower lobe of the lung or bronchus, where the specific site is not further specified. Lung cancer is a leading cause of cancer-related mortality worldwide, often linked to risk factors such as smoking, environmental pollutants, and genetic predispositions. The lower lobe of the lung is a common site for primary lung tumors, which can present as adenocarcinoma, squamous cell carcinoma, or small cell lung cancer. Diagnosis typically involves imaging studies such as CT scans, followed by biopsy for histological confirmation. Staging of lung cancer is crucial for determining prognosis and treatment options, utilizing the TNM classification system (Tumor, Node, Metastasis). Molecular markers, including EGFR mutations and ALK rearrangements, play a significant role in targeted therapies. Treatment algorithms may include surgery, chemotherapy, radiation therapy, and immunotherapy, tailored to the stage and molecular profile of the tumor.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in staging and treatment protocols
  • Need for precise documentation of tumor location and type
  • Potential for multiple co-existing lung conditions
  • Complexity of molecular marker testing and interpretation

Audit Risk Factors

  • Inadequate documentation of smoking history
  • Failure to document staging details
  • Lack of clarity on tumor type and histology
  • Inconsistent coding of co-existing lung conditions

Specialty Focus

Medical Specialties

Oncology

Documentation Requirements

Detailed pathology reports, imaging studies, and treatment plans must be documented.

Common Clinical Scenarios

Initial diagnosis of lung cancer, staging workup, and treatment planning.

Billing Considerations

Ensure accurate documentation of molecular testing results and treatment response.

Pulmonology

Documentation Requirements

Comprehensive pulmonary function tests and imaging studies are essential.

Common Clinical Scenarios

Management of lung cancer symptoms and complications, such as pleural effusion.

Billing Considerations

Document any co-morbid respiratory conditions that may affect treatment.

Coding Guidelines

Inclusion Criteria

Use C34.30 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of the site, laterality, and staging of the malignancy
  • Include any relevant co
  • morbid conditions that may impact treatment

Exclusion Criteria

Do NOT use C34.30 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

32405CPT Code

Video-assisted thoracoscopic lobectomy

Clinical Scenario

Used for surgical resection of the lower lobe tumor.

Documentation Requirements

Operative report detailing the procedure and findings.

Specialty Considerations

Oncology and thoracic surgery must coordinate documentation.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of lung cancer, improving the granularity of data for treatment and research. C34.30 provides a clear designation for lower lobe malignancies, aiding in better tracking and management of lung cancer cases.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of lung cancer, improving the granularity of data for treatment and research. C34.30 provides a clear designation for lower lobe malignancies, aiding in better tracking and management of lung cancer cases.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of lung cancer, improving the granularity of data for treatment and research. C34.30 provides a clear designation for lower lobe malignancies, aiding in better tracking and management of lung cancer cases.

Resources

Clinical References

  • •
    American Cancer Society - Lung Cancer

Coding & Billing References

  • •
    American Cancer Society - Lung Cancer

Frequently Asked Questions

What is the significance of staging in lung cancer?

Staging is crucial as it determines the extent of the disease, guides treatment options, and helps predict prognosis. Accurate staging requires detailed imaging and pathology reports.