ICD-10 Code C57.20 – Malignant neoplasm of unspecified round ligament (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C57.20 – Malignant neoplasm of unspecified round ligament
What it is
This code identifies a malignant tumor arising in the round ligament when the site is not further specified. Use it when the record confirms cancer of the round ligament but does not name the exact side or more specific location.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a mass, pelvic or groin pain, or imaging and pathology consistent with malignancy, but the diagnosis must be documented by the clinician.
When to use this code
Use C57.20 when the provider documents primary cancer of the round ligament and does not identify a more specific anatomic site. It may also apply when pathology or operative notes state malignancy of the round ligament without laterality or further detail. If the chart is unclear, check documentation before coding.
Do not use for
Do not use this code for benign round ligament lesions, metastatic disease to the round ligament, or malignancies clearly assigned to another pelvic or genital site. Check documentation if the exact origin is uncertain.
Coding tip
Confirm that the record supports a primary malignant neoplasm of the round ligament and that no more specific code is available before assigning C57.20.