Objective To explore the operation code of main diagnosis and treatment methods of lung cancer.Methods The main diagnostic operations in the field of lung cancer mainly include transbronchial needle aspiration biopsy, transbron chial lung biopsy, transbronchoscope pollution protection brush technology and bronchoalveolar lavage, etc.; while the therapeutic operations mainly include high frequency electric cauterization technology, cryoablation, endotracheal stent implantation, radiofrequency ablation of lung cancer and radioactive particle implantation through bronchoscope, etc. In this paper, we analyzed the clinical knowledge of the aforementioned diagnosis and treatment operations, and then sorted out and summarized the corresponding codes based on the classification principles of ICD-9-CM-3.Results Different diagnosis and treatment methods, operation sites and approaches led to different operation classification codes.Conclusion In order to accurately code and fully express medical record information, coders need to fully understand the latest clinical technologies, master the principles of surgical classification, and review the medical records carefully.