C34.02
BillableMalignant neoplasm of left main bronchus
HCC Category Mapping
V28HCC 20 — Lung and Other Severe Cancers
0.000V24HCC 9 — Lung and Other Severe Cancers
0.973ESRDHCC 9 — Lung and Other Severe Cancers
0.000RxHCCHCC 20 — Cancer, Liver and Intrahepatic Bile Duct
0.000What This Code Means
This code describes cancer that starts in the main airway (bronchus) on the left side of the lungs. It is a malignant tumor that originates in this specific location rather than spreading from elsewhere.
Coding Tips
- •Verify laterality is documented as left-sided in the medical record before assigning this code; right-sided tumors use C34.01
- •This code is specific to the main bronchus; if the tumor involves other lung regions, review documentation carefully to ensure the primary site is correctly identified
Clinical Significance
Left main bronchus cancer specifies laterality for central lung malignancy. The left main bronchus is longer and narrower than the right, and tumors here are in close proximity to the aortic arch and left pulmonary artery, which may limit surgical options. Left pneumonectomy carries higher morbidity than right-sided, affecting treatment decisions.
Documentation Requirements
- ✓Pathology with histological type and molecular markers
- ✓Bronchoscopy or imaging confirming left main bronchus location
- ✓Explicit left-sided laterality documentation
- ✓Assessment of aortic arch and pulmonary artery involvement
- ✓TNM staging and surgical candidacy evaluation
Commonly Confused Codes
C34.01 — Right main bronchus: Verify laterality carefully; right vs. left has different surgical implicationsC34.12 — Left upper lobe: Main bronchus is proximal to lobar origin; distinguish carefullyC34.00 — Unspecified main bronchus: Use C34.02 when left side is documentedC34.92 — Left lung, unspecified part: C34.02 is more specific for main bronchus location
Code Hierarchy
└C34Malignant neoplasm of bronchus and lung└C34.0Malignant neoplasm of main bronchus└C34.02Malignant neoplasm of left main bronchus
└C34.02Malignant neoplasm of left main bronchus