ICD-10 Code C57.2 – Malignant neoplasm of round ligament (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C57.2 – Malignant neoplasm of round ligament
What it is
C57.2 identifies a malignant neoplasm arising in the round ligament. Use it when documentation states cancer of the round ligament, including primary malignant disease at that site.
Clinical signs
Clinical features vary; refer to documentation. Standard references describe a malignant pelvic mass or a lesion found on imaging, exam, or pathology, but the diagnosis should be supported by provider documentation.
When to use this code
Use C57.2 when the record clearly documents malignant neoplasm of the round ligament as the site of origin. It is appropriate for confirmed primary malignancy, whether identified clinically, surgically, or histologically. Check documentation if the site is uncertain or if the cancer is described only as pelvic or adnexal.
Do not use for
Do not use this code for benign round ligament lesions, inflammatory conditions, or nonspecific pelvic masses. If the documentation does not specify the round ligament as malignant, check documentation.
Coding tip
Code the documented anatomic site exactly; if the provider names another gynecologic site, choose the code that matches that site.