C78.0Secondary malignant neoplasm of lung

C78.0 is the ICD-10-CM diagnosis code for secondary malignant neoplasm of lung. It belongs to category C78 (secondary malignant neoplasm of respiratory and digestive organs), block C76-C80 (malignant neoplasms of ill-defined, other secondary and unspecified sites) 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 C78 (secondary malignant neoplasm of respiratory and digestive organs), C78.0 is specifically for secondary malignant neoplasm of lung. Related codes cover mediastinum (C78.1), pleura (C78.2), other and unspecified respiratory organs (C78.3), small intestine (C78.4), large intestine and rectum (C78.5), retroperitoneum and peritoneum (C78.6), liver and intrahepatic bile duct (C78.7) and other and unspecified digestive organs (C78.8).

To report this condition, pick the subcode that matches the documentation: C78.00 (lung), C78.01 (lung) and C78.02 (lung).

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