ICD-10 Code C56.3 – Malignant neoplasm of bilateral ovaries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C56.3 – Malignant neoplasm of bilateral ovaries
What it is
C56.3 identifies a malignant tumor involving both ovaries. Use it when documentation clearly states cancer of the bilateral ovaries or equivalent wording.
Clinical signs
Clinical features vary; refer to documentation. Common findings in ovarian malignancy may include pelvic or abdominal mass, bloating, pain, or nonspecific gastrointestinal symptoms.
When to use this code
Use C56.3 when the provider documents primary cancer in both ovaries, including bilateral involvement at diagnosis. It also fits when pathology or imaging supports malignancy of both ovaries and the record is clear.
If the chart only says “ovarian cancer” without laterality, check documentation before assigning this code. Code the condition exactly as documented and confirm whether one ovary, both ovaries, or an unspecified site is intended.
Do not use for
Do not use C56.3 for benign ovarian tumors, borderline tumors, or metastatic disease to the ovaries. Check documentation if the cancer origin is uncertain.
Coding tip
Verify laterality in the operative note, pathology report, or assessment before coding, because C56.3 requires bilateral ovarian involvement.