Adenocarcinoma Lung ICD-10-CM Codes | 2025

The ICD-10-CM diagnosis code commonly used for adenocarcinoma of the lung is C34.90 – Malignant neoplasm of unspecified part of bronchus or lung. For more specificity, codes like C34.11 (malignant neoplasm of upper lobe, part of right bronchus or lung) or C34.32 (lower lobe, left bronchus or lung) should be used when the tumor location is known.

In the tenth revision of the International Classification of Diseases (ICD-10-CM), non-small cell lung cancer (NSCLC) is not given a distinct code. Instead, it falls under broader categories such as malignant neoplasm of the bronchus and lung. Clinicians must choose the code that matches the tumor’s precise anatomical site, including whether it involves the upper, lower, or unspecified part of the bronchus or lung.

Yes. For patients with a personal history of malignant neoplasm of the lung, the appropriate ICD-10-CM code is Z85.118. Additionally, Z77.22 is used for exposure to environmental tobacco smoke, which is a significant risk factor for developing non-small cell lung cancer. Accurate documentation of such history supports risk assessment and long-term monitoring.