ICD-10 Code D39 – Neoplasm of uncertain behavior of female genital organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D39 – Neoplasm of uncertain behavior of female genital organs
What it is
D39 identifies a neoplasm in the female genital organs whose behavior is uncertain. Use it when the record shows a tumor that is neither clearly benign nor clearly malignant.
Clinical signs
Clinical features vary; refer to documentation. Findings may include an adnexal, uterine, cervical, or vulvar mass, but the pathology or clinical assessment does not confirm malignant behavior.
When to use this code
Use D39 when the provider documents an uncertain-behavior tumor of a female reproductive organ and has not assigned a benign or malignant diagnosis. It is appropriate for confirmed neoplasms described as borderline, uncertain, or of unspecified biologic behavior. Check documentation for the exact site and wording.
Do not use for
Do not use D39 for clearly benign lesions or for malignant neoplasms of the female genital organs. If the record identifies a cyst, inflammatory process, or another non-neoplastic condition, choose the documented diagnosis instead.
Coding tip
Code the specific anatomic site from the documentation whenever it is stated, and query the provider if behavior is unclear.