ICD10
ICD-10 Code C77: Secondary and unspecified malignant neoplasm of lymph nodes
Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).
When is it used?
- May be used when a clinician documents secondary and unspecified malignant neoplasm of lymph nodes in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
Code hierarchy
chapter
2Neoplasms (C00-D49)
block
C00-C96Malignant neoplasms
block
C76-C80Malignant neoplasms of ill-defined, other secondary and unspecified sites
currentC76-C80
Official coding notes
Excludes1 (do not code together)
- 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)
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
OncologistGeneral Physician
Related codes
C77.0Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neckcodeC77.1Secondary and unspecified malignant neoplasm of intrathoracic lymph nodescodeC77.2Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodescodeC77.3Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodescodeC77.4Secondary and unspecified malignant neoplasm of inguinal and lower limb lymph nodescodeC77.5Secondary and unspecified malignant neoplasm of intrapelvic lymph nodescodeC77.8Secondary and unspecified malignant neoplasm of lymph nodes of multiple regionscodeC77.9Secondary and unspecified malignant neoplasm of lymph node, unspecifiedcode
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
C77
Replacement codes
C77.0 — Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neckC77.1 — Secondary and unspecified malignant neoplasm of intrathoracic lymph nodesC77.2 — Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodesC77.3 — Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodesC77.4 — Secondary and unspecified malignant neoplasm of inguinal and lower limb lymph nodesC77.5 — Secondary and unspecified malignant neoplasm of intrapelvic lymph nodesC77.8 — Secondary and unspecified malignant neoplasm of lymph nodes of multiple regionsC77.9 — Secondary and unspecified malignant neoplasm of lymph node, unspecified
Common synonyms
Secondary and unspecified malignant neoplasm of lymph nodesSecondary and malignant neoplasm of lymph nodes
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.