C78.00: Secondary malignant neoplasm of unspecified lung
C78.00 is the billable ICD-10-CM diagnosis code for Secondary malignant neoplasm of unspecified lung. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code C78.00?
C78.00 is the ICD-10-CM diagnosis code for Secondary malignant neoplasm of unspecified lung. It belongs to category C78 (Secondary malignant neoplasm of respiratory and digestive organs).
Is C78.00 a billable code?
Yes. C78.00 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does C78.00 belong to?
C78.00 is part of ICD-10-CM category C78 — Secondary malignant neoplasm of respiratory and digestive organs, which has 28 billable codes.
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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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