ICD-10 Code C57.22 – Malignant neoplasm of left round ligament (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C57.22 – Malignant neoplasm of left round ligament
What it is
This code identifies a malignant tumor arising in the left round ligament, a supporting structure of the female reproductive tract. Use it when documentation specifies primary cancer in that exact site.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a pelvic or groin mass, pain, or symptoms related to local invasion, but diagnosis depends on pathology and site confirmation.
When to use this code
Use C57.22 when the provider documents malignant neoplasm of the left round ligament, including primary cancer at that location. It is appropriate when pathology, imaging, or operative notes clearly support the left-sided site. If the record only says pelvic malignancy or metastatic disease, check documentation before assigning this code.
Do not use for
Do not use this code for benign tumors, inflammatory disease, or nonspecific adnexal masses. Do not assign it when the left round ligament is only involved by metastasis from another primary site.
Coding tip
Verify laterality and whether the tumor is primary or secondary before coding.