C57.21
BillableMalignant neoplasm of right 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
Cancer that develops in the right round ligament, a cord-like structure that helps support the uterus on the right side.
Coding Tips
- •Ensure right side is explicitly documented before coding; round ligament cancers are uncommon
- •Verify this is not a metastatic cancer from another primary site
Clinical Significance
Right round ligament malignancy is an exceedingly rare tumor that may present as a right inguinal mass mimicking a hernia or lymphadenopathy. Correct anatomical identification and laterality documentation are critical for accurate coding and to ensure appropriate surgical management and surveillance.
Documentation Requirements
- ✓Documentation specifying right-sided round ligament involvement
- ✓Pathologic confirmation of malignancy
- ✓Histologic type and grade
- ✓Staging and treatment plan
- ✓Confirmation that this is a primary neoplasm rather than metastatic disease
Commonly Confused Codes
Code Hierarchy
└C57Malignant neoplasm of other and unspecified female genital organs└C57.2Malignant neoplasm of round ligament└C57.21Malignant neoplasm of right round ligament
└C57.21Malignant neoplasm of right round ligament