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C56.9 — Malignant neoplasm of unspecified ovary
C56.9
What this code means
Cancer that starts in an ovary, the female reproductive glands that produce eggs and hormones.
Also called: ovarian cancer.
When this code is used
Used for malignant neoplasm of an ovary when the side is not specified.
Where it sits in ICD-10-CM
Code C56.9 belongs to Chapter 2: Neoplasms, which covers codes C00–D49 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Learn more about this condition
Related anatomy
Watch: related videos
Frequently asked questions
What is ICD-10-CM code C56.9?
C56.9 is the ICD-10-CM diagnosis code for “Malignant neoplasm of unspecified ovary”. Cancer that starts in an ovary, the female reproductive glands that produce eggs and hormones.
When is code C56.9 used?
Used for malignant neoplasm of an ovary when the side is not specified. It belongs to Chapter 2 of ICD-10-CM (Neoplasms).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.