2026 ICD-10-CM Diagnosis Code C56Malignant neoplasm of ovary

ICD-10-CM Codes›C00–D49›C51-C58›C56

ICD-10-CM C56
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C56 is a non-billable ICD-10-CM category code for malignant neoplasm of ovary, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C56.1, C56.2, C56.3, and C56.9.

Code Identity

ICD-10-CM Code
C56
Billable Status
No — Non-Billable Category
Code Describes
Malignant neoplasm of ovary
Short Description
Malignant neoplasm of ovary
Same as the full description in the CMS dataset.
Chapter
C51-C58
Malignant neoplasms of female genital organs

Code Classification

ChapterC00–D49Neoplasms
SectionC51-C58Malignant neoplasms of female genital organs
CategoryC56Malignant neoplasm of ovary
This CodeC56Malignant neoplasm of ovary

Specific Coding for Malignant neoplasm of ovaryOverview

Non-specific codes like C56 require more characters. Use one of these billable codes instead:

  • Use C56.1 for Malignant neoplasm of right ovary

  • Use C56.2 for Malignant neoplasm of left ovary

  • Use C56.3 for Malignant neoplasm of bilateral ovaries

  • Use C56.9 for Malignant neoplasm of unspecified ovary

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Use Additional Code

  • code to identify any functional activity

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Patient EducationClinical

Ovarian Cancer

Cancer is a disease in which abnormal cells in the body grow out of control and form a tumor. Ovarian cancer is a cancerous tumor that forms in the tissues of an ovary. The ovaries are a pair of female reproductive glands that make eggs and female hormones.

The full article covers:

  • What is ovarian cancer?
  • What are the types of ovarian cancer?
  • What causes ovarian cancer?
  • Who is more likely to develop ovarian cancer?
  • What are the symptoms of ovarian cancer?
  • How is ovarian cancer diagnosed?
  • What are the treatments for ovarian cancer?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C56Overview

What is the ICD-10 code for malignant neoplasm of ovary?

C56 is the ICD-10-CM category for malignant neoplasm of ovary, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is C56 (Malignant neoplasm of ovary) a billable code?

No. This is a category header that groups the codes for malignant neoplasm of ovary, and headers cannot be submitted on claims. Claims for malignant neoplasm of ovary need a more specific code from this category, such as C56.1, C56.2, and C56.3.