Secondary and unspecified malignant neoplasm of lymph nodes (C77) ICD-10-CM
The C77 code range covers secondary and unspecified malignant neoplasm of lymph nodes with 9 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the C77 Range 9 codes · 8 billable
- C77 Secondary and unspecified malignant neoplasm of lymph nodesNon-billable
- C77.0 Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neck
- C77.1 Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes
- C77.2 Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes
- C77.3 Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodes
- C77.4 Secondary and unspecified malignant neoplasm of inguinal and lower limb lymph nodes
- C77.5 Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes
- C77.8 Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions
- C77.9 Secondary and unspecified malignant neoplasm of lymph node, unspecified
About the C77 Code Range
ICD-10 code C77 covers secondary and unspecified malignant neoplasms (cancers) that have spread to lymph nodes. These codes specify locations such as the head and neck (C77.0), intrathoracic (C77.1), intra-abdominal (C77.2), axilla and upper limb (C77.3), inguinal and lower limb (C77.4), intrapelvic lymph nodes (C77.5), multiple regions (C77.8), and unspecified lymph nodes (C77.9).
These ICD-10 codes are used to document cancer metastases in lymph nodes outside the primary tumor site. For example, C77.0 includes metastases such as metastatic squamous cell carcinoma or adenocarcinoma to lymph nodes of the head and neck regions, commonly referred to by synonyms like metastatic carcinoma to parotid or supraclavicular lymph nodes. Similarly, C77.1 refers to malignant spread to thoracic lymph nodes, including mediastinal or tracheobronchial nodes, often associated with lung or respiratory cancers. The codes assist in accurately classifying metastatic involvement by specific lymph node locations described with terms like "metastatic adenocarcinoma to abdominal lymph nodes" for C77.2 or "metastatic malignant neoplasm to axilla" for C77.3. Using the ICD-10 code for secondary malignant neoplasm of lymph nodes guides clinicians and coders in tracking the spread of malignancies and planning treatment accordingly.
Questions About This Page
How many billable codes are in the C77 range?
Of the 9 codes in this range, 8 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the C77 range classify?
The range classifies secondary and unspecified malignant neoplasm of lymph nodes. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
