2026 ICD-10-CM Diagnosis Code C34Malignant neoplasm of bronchus and lung

ICD-10-CM Codes›C00–D49›C30-C39›C34

ICD-10-CM C34
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C34 is a non-billable ICD-10-CM category code for malignant neoplasm of bronchus and lung, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C34.00, C34.01, C34.02, and C34.10.

Code Identity

ICD-10-CM Code
C34
Billable Status
No — Non-Billable Category
Code Describes
Malignant neoplasm of bronchus and lung
Short Description
Malignant neoplasm of bronchus and lung
Same as the full description in the CMS dataset.
Chapter
C30-C39
Malignant neoplasms of respiratory and intrathoracic organs

Code Classification

ChapterC00–D49Neoplasms
SectionC30-C39Malignant neoplasms of respiratory and intrathoracic organs
CategoryC34Malignant neoplasm of bronchus and lung
This CodeC34Malignant neoplasm of bronchus and lung

Specific Coding for Malignant neoplasm of bronchus and lungOverview

Non-specific codes like C34 require more characters. Use one of these billable codes instead:

  • C34.0 for Malignant neoplasm of main bronchus

  • Use C34.00 for Malignant neoplasm of unspecified main bronchus

  • Use C34.01 for Malignant neoplasm of right main bronchus

  • Use C34.02 for Malignant neoplasm of left main bronchus

  • C34.1 for Malignant neoplasm of upper lobe, bronchus or lung

  • Use C34.10 for Malignant neoplasm of upper lobe, unspecified bronchus or lung

  • Use C34.11 for Malignant neoplasm of upper lobe, right bronchus or lung

  • Use C34.12 for Malignant neoplasm of upper lobe, left bronchus or lung

  • Use C34.2 for Malignant neoplasm of middle lobe, bronchus or lung

  • C34.3 for Malignant neoplasm of lower lobe, bronchus or lung

  • Use C34.30 for Malignant neoplasm of lower lobe, unspecified bronchus or lung

  • Use C34.31 for Malignant neoplasm of lower lobe, right bronchus or lung

  • Use C34.32 for Malignant neoplasm of lower lobe, left bronchus or lung

  • C34.8 for Malignant neoplasm of overlapping sites of bronchus and lung

  • Use C34.80 for Malignant neoplasm of overlapping sites of unspecified bronchus and lung

  • Use C34.81 for Malignant neoplasm of overlapping sites of right bronchus and lung

  • Use C34.82 for Malignant neoplasm of overlapping sites of left bronchus and lung

  • C34.9 for Malignant neoplasm of unspecified part of bronchus or lung

  • Use C34.90 for Malignant neoplasm of unspecified part of unspecified bronchus or lung

  • Use C34.91 for Malignant neoplasm of unspecified part of right bronchus or lung

  • Use C34.92 for Malignant neoplasm of unspecified part of left bronchus or lung

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Use Additional Code

  • code to identify:
  • exposure to environmental tobacco smoke Z77.22
  • exposure to tobacco smoke in the perinatal period P96.81
  • history of tobacco dependence Z87.891
  • occupational exposure to environmental tobacco smoke Z57.31
  • tobacco dependence F17
  • tobacco use Z72.0

Type 1 Excludes

  • Kaposi's sarcoma of lung C46.5
  • malignant carcinoid tumor of the bronchus and lung C7A.090

Patient EducationClinical

Lung Cancer

Lung cancer is cancer that forms in tissues of the lung, usually in the cells that line the air passages. It is the leading cause of cancer death in both men and women.

The full article covers:

  • What is lung cancer?
  • Who is more likely to develop lung cancer?
  • What are the symptoms of lung cancer?
  • How is lung cancer diagnosed?
  • What are the treatments for lung cancer?
  • Can lung cancer be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C34Overview

Is C34 (Malignant neoplasm of bronchus and lung) a billable code?

No. This is a category header that groups the codes for malignant neoplasm of bronchus and lung, and headers cannot be submitted on claims. Claims for malignant neoplasm of bronchus and lung need a more specific code from this category, such as C34.00, C34.01, and C34.02.