ICD-10 Code C77.5 – Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C77.5 – Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes
What it is
This code identifies metastatic malignant disease in the intrapelvic lymph nodes. Use it when a primary cancer has spread to pelvic lymph nodes, or when the primary site is not specified.
Clinical signs
Findings often reflect the underlying cancer rather than the nodes themselves. Clinical features vary; refer to documentation for imaging, biopsy, or pathology evidence of pelvic nodal involvement.
When to use this code
Use C77.5 when the record documents secondary malignant involvement of intrapelvic lymph nodes. It also applies when the site is described as unspecified malignant neoplasm in these nodes. Code the primary cancer separately when documented.
Do not use for
Do not use this code for benign lymph node enlargement, infection, or inflammatory pelvic nodes. Check documentation if the record does not clearly state metastatic malignant disease.
Coding tip
Verify that the note supports metastatic disease in intrapelvic nodes and link it to the documented primary malignancy when available.