Non-Billable / Non-Specific Code
ICD-10-CM C77 is the diagnosis code for Secondary and unspecified malignant neoplasm of lymph nodes. This code falls under the section "Malignant neoplasms of ill-defined, other secondary and unspecified sites" within Chapter 2 — Neoplasms (C00-D49). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as C77. They are mutually exclusive:
Understanding where C77 sits in the ICD-10-CM classification helps ensure proper coding:
No, C77 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
C77 is the ICD-10-CM diagnosis code for "Secondary and unspecified malignant neoplasm of lymph nodes". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
C77 is located in Section C76-C80 — "Malignant neoplasms of ill-defined, other secondary and unspecified sites" within Chapter 2 of the ICD-10-CM Tabular List.
C77 has 8 sub-code(s) that provide more specific detail: C77.0, C77.1, C77.2, C77.3, C77.4 and more.
Use C77 when the patients documented diagnosis matches "Secondary and unspecified malignant neoplasm of lymph nodes" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Secondary and unspecified malignant neoplasm of lymph nodes is C77.
No, C77 is non-billable. Use a more specific sub-code for primary diagnosis billing.
C77 is in Chapter 2 of the ICD-10-CM Tabular List.
Type 1 Excludes for C77 include: malignant neoplasm of lymph nodes, specified as primary (C81-C86, C88, C96.-); mesentery metastasis of carcinoid tumor (C7B.04); secondary carcinoid tumors of distant lymph nodes (C7B.01).
Yes, C77 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.