C51.1
BillableMalignant neoplasm of labium minus
HCC Category Mapping
V28HCC 22 — Colorectal, Bladder, and Other Cancers
0.000V24HCC 11 — Colorectal, Bladder, and Other Cancers
0.306ESRDHCC 11 — Colorectal, Bladder, and Other Cancers
0.000What This Code Means
Cancer that develops in the smaller inner folds of the female external genitalia (labia minora).
Coding Tips
- •Document the histological type and grade when available for treatment planning
- •Note any involvement of adjacent structures for proper staging classification
Clinical Significance
Malignant neoplasm of the labium minus is a vulvar cancer involving the inner, smaller folds of the female external genitalia. This location may present diagnostic challenges as tumors here can extend to involve the vaginal introitus or clitoris. Early-stage vulvar cancer of the labium minus may be treated with wide local excision, while advanced disease may require radical vulvectomy.
Documentation Requirements
- ✓Anatomical site confirmed as labium minus specifically
- ✓Histological type and grade
- ✓TNM staging with depth of stromal invasion
- ✓Inguinofemoral lymph node status
- ✓Human Papillomavirus association if documented
- ✓Surgical margins status if resection performed
- ✓Extension to adjacent structures documented
Commonly Confused Codes
C51.0 — Malignant neoplasm of labium majus; outer fold versus inner fold distinctionC51.2 — Malignant neoplasm of clitoris; adjacent but distinct anatomical structureC51.8 — Overlapping sites of vulva; use when tumor involves both labia or extends across multiple structuresC52 — Malignant neoplasm of vagina; if tumor extends from labium minus to vaginal introitus, determine the primary site
Code Hierarchy
└C51Malignant neoplasm of vulva└C51.1Malignant neoplasm of labium minus
└C51.1Malignant neoplasm of labium minus