ICD-10 Code D39.8 – Neoplasm of uncertain behavior of other specified female genital organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D39.8 – Neoplasm of uncertain behavior of other specified female genital organs
What it is
This code identifies a tumor in a female genital organ that is not clearly benign or malignant. Use it when the record specifies another female genital site and the behavior remains uncertain.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a mass, abnormal imaging, or tissue pathology suggesting indeterminate behavior rather than confirmed cancer or benign growth.
When to use this code
Use D39.8 when the provider documents a neoplasm of uncertain behavior in a specified female genital organ not named in a more specific code. It is appropriate after evaluation, biopsy, or imaging when the behavior is still unresolved. Check documentation if the site is unclear.
Do not use for
Do not use this code for benign, malignant, or in situ neoplasms. Also avoid it when the record does not identify a female genital organ or when a more specific ICD-10 code is available.
Coding tip
Code the exact documented site and confirm that “uncertain behavior” is stated, not implied.