C57.00
BillableMalignant neoplasm of unspecified fallopian tube
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 fallopian tube, which is the tube that carries eggs from the ovary to the uterus, where the specific side is not identified.
Coding Tips
Clinical Significance
Malignant neoplasm of unspecified fallopian tube captures a rare gynecological malignancy without laterality specification. Fallopian tube cancer is now understood to be more common than previously thought, as many cancers previously classified as ovarian primaries may actually originate in the fallopian tube fimbria. This has led to the inclusion of fallopian tube cancer in the 'ovarian-tubal-peritoneal' cancer spectrum.
Documentation Requirements
- ✓Confirmed malignancy of the fallopian tube (not metastatic from ovary or uterus)
- ✓Documentation of why laterality cannot be determined
- ✓Histological type (serous carcinoma predominates)
- ✓FIGO staging (uses ovarian cancer staging system)
- ✓Peritoneal spread assessment
- ✓BRCA mutation testing status
- ✓CA-125 levels
- ✓Surgical pathology confirming tubal primary
Commonly Confused Codes
C57.01 — Right fallopian tube; use when right laterality is confirmedC57.02 — Left fallopian tube; use when left laterality is confirmedC56.9 — Unspecified ovary; distinguish tubal primary from ovarian primary — both may present with adnexal massC48.2 — Peritoneum, unspecified; primary peritoneal carcinoma is a separate diagnosis from tubal cancer
Code Hierarchy
└C57Malignant neoplasm of other and unspecified female genital organs└C57.0Malignant neoplasm of fallopian tube└C57.00Malignant neoplasm of unspecified fallopian tube
└C57.00Malignant neoplasm of unspecified fallopian tube