ICD-10 Code C57.9 – Malignant neoplasm of female genital organ, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C57.9 – Malignant neoplasm of female genital organ, unspecified
What it is
C57.9 identifies a malignant neoplasm arising in a female genital organ when the exact site is not documented. Use it only when the record confirms cancer but does not specify the ovary, uterus, cervix, vulva, vagina, or other female genital site.
Clinical signs
Clinical features vary; refer to documentation. Common cancer-related findings may include a documented pelvic mass, abnormal bleeding, pain, or biopsy-confirmed malignancy, but the key requirement is an unspecified female genital primary site.
When to use this code
Use C57.9 when the provider documents a malignant neoplasm of a female genital organ and does not name the specific organ. It also fits when pathology, imaging, or consultation notes confirm the malignancy site is not further defined in the chart. If later documentation identifies the exact site, code that more specific diagnosis instead.
Do not use for
Do not use this code for benign tumors, dysplasia, or metastatic disease to the female genital organs from another primary site. Check documentation if the record names a specific genital organ or another primary cancer.
Coding tip
Query for the exact primary site before defaulting to C57.9, because a more specific code is preferred whenever documentation supports it.