Secondary and unspecified malignant neoplasm of lymph nodes (C77)

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.