C57.22
BillableMalignant neoplasm of left round ligament
HCC Category Mapping
V28HCC 22 — Colorectal, Bladder, and Other Cancers
0.000V24HCC 10 — Lymphoma and Other Cancers
0.675ESRDHCC 10 — Lymphoma and Other Cancers
0.000RxHCCHCC 22 — Cancer, Other Specified Sites
0.000What This Code Means
This code describes cancer that has developed in the left round ligament, which is a structure in the female reproductive system that helps support the uterus. This is a type of gynecological cancer affecting the ligament tissue itself.
Coding Tips
- •Ensure documentation specifies the left side; if the round ligament cancer is on the right side, use C57.21 instead, and for unspecified side use C57.20
- •Verify that the malignancy is primary to the round ligament itself rather than metastatic cancer from another site, as this affects code selection
Clinical Significance
Left round ligament malignancy is an exceedingly rare tumor that may present as a left inguinal mass. Precise anatomical identification differentiates this from benign conditions like inguinal hernia or cyst of the canal of Nuck. Accurate laterality supports cancer registry reporting and treatment planning.
Documentation Requirements
- ✓Documentation specifying left-sided round ligament involvement
- ✓Pathologic confirmation of malignancy with histologic type
- ✓Staging information
- ✓Primary versus metastatic determination
- ✓Current treatment status
Commonly Confused Codes
Code Hierarchy
└C57Malignant neoplasm of other and unspecified female genital organs└C57.2Malignant neoplasm of round ligament└C57.22Malignant neoplasm of left round ligament
└C57.22Malignant neoplasm of left round ligament