C56.1
BillableMalignant neoplasm of right ovary
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 starts in the right ovary, one of the two female reproductive glands that produce eggs and hormones.
Coding Tips
- •Confirm laterality is specifically documented as right; do not assume if bilateral involvement is possible
- •Verify histology type (serous, mucinous, clear cell, etc.) for complete coding
Clinical Significance
Malignant neoplasm of the right ovary is a significant oncological diagnosis. Ovarian cancer is often called the 'silent killer' because it frequently presents at advanced stages due to nonspecific symptoms. It is the most lethal gynecological malignancy with a five-year survival rate that varies dramatically by stage — over 90% for stage I but under 30% for stage III/IV.
Documentation Requirements
- ✓Laterality confirmed as right ovary
- ✓Histological type (serous, mucinous, endometrioid, clear cell, transitional, undifferentiated)
- ✓Grade (low-grade vs. high-grade serous is a critical distinction)
- ✓FIGO staging
- ✓Peritoneal spread assessment
- ✓Lymph node status
- ✓CA-125 and other tumor marker levels
- ✓BRCA mutation status if tested
- ✓Debulking surgery status (optimal vs. suboptimal cytoreduction)
Commonly Confused Codes
C56.2 — Left ovary; laterality reversalC56.3 — Bilateral ovaries; use when both ovaries are confirmed malignantC56.9 — Unspecified ovary; use only when laterality is unknownD27.0 — Benign neoplasm of right ovary; must confirm malignancy vs. benign tumorC79.62 — Secondary malignant neoplasm of right ovary; use when ovarian involvement is metastatic from another primaryC57.01 — Right fallopian tube cancer; adjacent structure — determine primary site