ICD-10 Code C77.2 – Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C77.2 – Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes
What it is
C77.2 identifies metastatic cancer involving lymph nodes within the abdomen. Use it when the record shows secondary malignant involvement of intra-abdominal lymph nodes, and the primary cancer site is known or documented elsewhere.
Clinical signs
Clinical features vary; refer to documentation. Imaging, biopsy, or pathology may show enlarged or infiltrated intra-abdominal lymph nodes consistent with metastatic disease.
When to use this code
Use this code when the provider documents secondary malignant neoplasm in intra-abdominal lymph nodes, such as mesenteric, retroperitoneal, or other abdominal nodal spread. It is also appropriate when the site is described as unspecified but clearly intra-abdominal. Code the primary malignancy separately when documented.
Do not use for
Do not use C77.2 for primary lymph node cancers or for lymph node enlargement without confirmed malignancy. Check documentation if the record only states abdominal mass, adenopathy, or suspected metastasis.
Coding tip
Verify both the metastatic site and the primary cancer site in the record before assigning C77.2.