C57.4
BillableMalignant neoplasm of uterine adnexa, unspecified
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 of the uterine adnexa (structures attached to the uterus like fallopian tubes and ovaries) when the exact location cannot be specified.
Coding Tips
- •Use this code only when the specific adnexal structure cannot be identified; be more specific if possible
- •Adnexa cancers require staging information for treatment planning
Clinical Significance
This code captures cancer of the uterine adnexa when the specific structure (ovary, fallopian tube, broad ligament, round ligament) cannot be identified. It is an unspecified code that should only be used when more specific site information is genuinely unavailable. In risk adjustment, using this code may signal insufficient documentation and could invite audit scrutiny.
Documentation Requirements
- ✓Documentation stating malignancy involves uterine adnexa without specifying exact structure
- ✓Explanation of why the specific adnexal organ cannot be identified
- ✓Pathology or imaging findings
- ✓Staging information
- ✓Treatment plan and current status
Commonly Confused Codes
C56.1/C56.2 — Ovarian cancer; use these when the ovary is specifically involvedC57.00-C57.02 — Fallopian tube cancer; use when the tube is the documented siteC57.10-C57.12 — Broad ligament cancer; more specific if documentedC57.7 — Other specified female genital organs; use when a specific organ is named but not in the C56-C57.4 range