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

C34.3 is the ICD-10-CM diagnosis code for malignant neoplasm of lower lobe, bronchus or lung. It belongs to category C34 (malignant neoplasm of bronchus and lung), block C30-C39 (malignant neoplasms of respiratory and intrathoracic organs) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within C34 (malignant neoplasm of bronchus and lung), C34.3 is specifically for malignant neoplasm of lower lobe, bronchus or lung. Related codes cover main bronchus (C34.0), upper lobe, bronchus or lung (C34.1), middle lobe, bronchus or lung (C34.2), overlapping sites of bronchus and lung (C34.8) and unspecified part of bronchus or lung (C34.9).

To report this condition, pick the subcode that matches the documentation: C34.30 (lung), C34.31 (lung) and C34.32 (lung).

Use an additional 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.-) and 1 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.