C34.12
BillableMalignant neoplasm of upper lobe, left bronchus or lung
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
Cancer that starts in the upper portion of the left lung or left main bronchus.
Coding Tips
- •This code specifies left-sided upper lobe lung cancer; ensure documentation clearly indicates left side
- •Verify whether the tumor involves the bronchus, lung parenchyma, or both for complete coding accuracy
Clinical Significance
Left upper lobe lung cancer includes the lingula, which is the left lung's equivalent of the right middle lobe. Left upper lobe tumors may involve the aortopulmonary window lymph nodes, affecting surgical approach. Accurate laterality coding supports surgical planning as left-sided resections have different anatomical considerations than right-sided.
Documentation Requirements
- ✓Pathology with histological type and molecular markers
- ✓Imaging confirming left upper lobe location
- ✓Explicit left-sided laterality documentation
- ✓TNM staging with aortopulmonary window node assessment
- ✓Surgical candidacy and pulmonary function testing
Commonly Confused Codes
C34.11 — Right upper lobe: Most common site; verify laterality carefullyC34.10 — Upper lobe, unspecified: Use C34.12 when left side is confirmedC34.32 — Left lower lobe: Ensure the correct lobe is identified, especially for tumors near the fissureC34.82 — Overlapping sites, left lung: Use when tumor spans multiple left lung regions
Code Hierarchy
└C34Malignant neoplasm of bronchus and lung└C34.1Malignant neoplasm of upper lobe, bronchus or lung└C34.12Malignant neoplasm of upper lobe, left bronchus or lung
└C34.12Malignant neoplasm of upper lobe, left bronchus or lung