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 | — |
| C78.0 | Secondary malignant neoplasm of lung | — |
| C78.00 | Secondary malignant neoplasm of unspecified lung | ✓ |
| C78.00 | Secondary malignant neoplasm of unspecified lung | ✓ |
| C78.01 | Secondary malignant neoplasm of right lung | ✓ |
| C78.01 | Secondary malignant neoplasm of right lung | ✓ |
| C78.1 | Secondary malignant neoplasm of mediastinum | ✓ |
| C78.1 | Secondary malignant neoplasm of mediastinum | ✓ |
| C78.02 | Secondary malignant neoplasm of left lung | ✓ |
| C78.02 | Secondary malignant neoplasm of left lung | ✓ |
| C78.2 | Secondary malignant neoplasm of pleura | ✓ |
| C78.2 | Secondary malignant neoplasm of pleura | ✓ |
| C78.3 | Secondary malignant neoplasm of other and unspecified respiratory organs | — |
| C78.3 | Secondary malignant neoplasm of other and unspecified respiratory organs | — |
| C78.4 | Secondary malignant neoplasm of small intestine | ✓ |
| C78.4 | Secondary malignant neoplasm of small intestine | ✓ |
| C78.5 | Secondary malignant neoplasm of large intestine and rectum | ✓ |
| C78.5 | Secondary malignant neoplasm of large intestine and rectum | ✓ |
| C78.6 | Secondary malignant neoplasm of retroperitoneum and peritoneum | ✓ |
| C78.6 | Secondary malignant neoplasm of retroperitoneum and peritoneum | ✓ |
| C78.7 | Secondary malignant neoplasm of liver and intrahepatic bile duct | ✓ |
| C78.7 | Secondary malignant neoplasm of liver and intrahepatic bile duct | ✓ |
| C78.8 | Secondary malignant neoplasm of other and unspecified digestive organs | — |
| C78.8 | Secondary malignant neoplasm of other and unspecified digestive organs | — |
| C78.30 | Secondary malignant neoplasm of unspecified respiratory organ | ✓ |
| C78.30 | Secondary malignant neoplasm of unspecified respiratory organ | ✓ |
| C78.31 | Secondary malignant neoplasm of larynx | ✓ |
| C78.32 | Secondary malignant neoplasm of pharynx | ✓ |
| C78.39 | Secondary malignant neoplasm of other respiratory organs | ✓ |
| C78.39 | Secondary malignant neoplasm of other respiratory organs | ✓ |
| C78.80 | Secondary malignant neoplasm of unspecified digestive organ | ✓ |
| C78.80 | Secondary malignant neoplasm of unspecified digestive organ | ✓ |
| C78.89 | Secondary malignant neoplasm of other digestive organs | ✓ |
| C78.89 | Secondary malignant neoplasm of other digestive organs | ✓ |
Frequently asked questions
What is ICD-10-CM code C78?
C78 is an ICD-10-CM category covering Secondary malignant neoplasm of respiratory and digestive organs. It contains 34 more specific diagnosis codes, 28 of which are billable.
Is C78 a billable code?
No — C78 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example C78.0 — Secondary malignant neoplasm of lung). 28 of the 34 codes under C78 are billable.
What codes fall under C78?
C78 includes C78.0, C78.0, C78.00, C78.00, C78.01, plus 29 more. See the full list with descriptions and billable status above.
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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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