ICD-10 Code D39.10 – Neoplasm of uncertain behavior of unspecified ovary (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D39.10 – Neoplasm of uncertain behavior of unspecified ovary
What it is
This code identifies an ovarian neoplasm whose behavior cannot be determined as benign or malignant. Use it when the ovary is documented as the site, but the specific ovary is not named.
Clinical signs
Clinical features vary; refer to documentation. Patients may have an adnexal mass, pelvic pain, bloating, or incidental imaging findings, but the record must support an ovarian tumor of uncertain behavior.
When to use this code
Use D39.10 when the provider documents an ovarian neoplasm of uncertain behavior and does not specify right or left ovary. It also fits pathology or imaging reports that describe uncertain biologic behavior without confirming malignancy. Check documentation if the laterality is unclear or if the lesion is described only as a cyst or mass.
Do not use for
Do not use this code for clearly benign ovarian cysts or confirmed malignant ovarian tumors. If the record specifies a right or left ovary, use the laterality-specific code instead.
Coding tip
Confirm both behavior and laterality in the report before assigning D39.10.