C34.90
BillableMalignant neoplasm of unspecified part of unspecified 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 of the lung or bronchus where the specific location and side are not specified or documented.
Coding Tips
- •This is the least specific lung cancer code; use only when no anatomical detail is available
- •Query the provider if possible to obtain more specific location and laterality information for better coding accuracy
Clinical Significance
This is the least specific lung cancer code, used when neither the anatomical location within the lung nor the laterality is documented. Lung cancer is the leading cause of cancer death, and even this unspecified code carries very high RAF weight. However, it is the most audit-vulnerable of all lung cancer codes and should prompt aggressive record review and provider query.
Documentation Requirements
- ✓Clinical or pathological confirmation of lung malignancy
- ✓Documentation that all imaging and pathology reports were reviewed for anatomical detail
- ✓Provider query for location and laterality
- ✓Treatment status and stage if determinable
- ✓Reason specificity cannot be determined
Commonly Confused Codes
C34.11/C34.12 — Upper lobe with laterality: Most lung cancers can be localized; review imagingC34.91/C34.92 — Unspecified part with laterality: At minimum, laterality should be determinableC78.00 — Secondary malignant neoplasm of lung: Ensure this is a primary lung cancerC80.1 — Malignant neoplasm, unspecified site: Even less specific; use when lung origin is uncertain
Code Hierarchy
└C34Malignant neoplasm of bronchus and lung└C34.9Malignant neoplasm of unspecified part of bronchus or lung└C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
└C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung