C78: Secondary malignant neoplasm of respiratory and digestive organs

Codes under C78 (Secondary malignant neoplasm of respiratory and digestive organs). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
C78.0	Secondary malignant neoplasm of lung	—
C78.00	Secondary malignant neoplasm of unspecified lung	✓
C78.01	Secondary malignant neoplasm of right lung	✓
C78.1	Secondary malignant neoplasm of mediastinum	✓
C78.02	Secondary malignant neoplasm of left lung	✓
C78.2	Secondary malignant neoplasm of pleura	✓
C78.3	Secondary malignant neoplasm of other and unspecified respiratory organs	—
C78.4	Secondary malignant neoplasm of small intestine	✓
C78.5	Secondary malignant neoplasm of large intestine and rectum	✓
C78.6	Secondary malignant neoplasm of retroperitoneum and peritoneum	✓
C78.7	Secondary malignant neoplasm of liver and intrahepatic bile duct	✓
C78.8	Secondary malignant neoplasm of other and unspecified digestive organs	—
C78.30	Secondary malignant neoplasm of unspecified respiratory organ	✓
C78.39	Secondary malignant neoplasm of other respiratory organs	✓
C78.80	Secondary malignant neoplasm of unspecified digestive organ	✓
C78.89	Secondary malignant neoplasm of other digestive organs	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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