C77.1: Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes
C77.1 is the billable ICD-10-CM diagnosis code for Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes. 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 C77.1?
C77.1 is the ICD-10-CM diagnosis code for Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes. It belongs to category C77 (Secondary and unspecified malignant neoplasm of lymph nodes).
Is C77.1 a billable code?
Yes. C77.1 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 C77.1 belong to?
C77.1 is part of ICD-10-CM category C77 — Secondary and unspecified malignant neoplasm of lymph nodes, which has 16 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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