ICD-10 Code C56.1 – Malignant neoplasm of right ovary (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C56.1 – Malignant neoplasm of right ovary
What it is
This code identifies a malignant tumor arising in the right ovary. Use it when the documentation clearly states primary ovarian cancer on the right side.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include pelvic or abdominal mass, bloating, pain, or imaging evidence of an ovarian malignancy.
When to use this code
Use C56.1 when the provider documents a malignant neoplasm of the right ovary, including confirmed primary ovarian cancer. Apply it when laterality is specified as right and there is no conflicting site description.
If the record mentions ovarian cancer without laterality, or if the tumor involves another pelvic site, check documentation before assigning this code. Confirm whether the neoplasm is primary, secondary, or uncertain.
Do not use for
Do not use this code for benign ovarian cysts, borderline tumors, or unspecified ovarian malignancy. Do not assign it when the cancer is documented in the left ovary, both ovaries, or another organ.
Coding tip
Always verify laterality and primary site in the pathology, operative note, or assessment before coding C56.1.