Malignant neoplasm of ovary
In Malignant neoplasms of female genital organs (C51-C58), chapter 2: Neoplasms
4 billable codes under C56: all are a CC; all map to HCC 22 (Bladder, Colorectal, and Other Cancers).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
Also indexed as: Brenner, tumor, malignant
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Instructional notes
Use additional code: add a second code for this, listed after this one
- code to identify any functional activity
Also applies, from Malignant neoplasms of female genital organs (C51-C58)
These notes sit on C51-C58 and apply to every code under it, including C56.
Includes: conditions that are coded here
- malignant neoplasm of skin of female genital organs
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding benign and malignant neoplasms: using the Neoplasm Table, sequencing primary and secondary sites, treatment encounters, complications, and current cancer versus personal history.
- Admission/Encounter for treatment of primary site (page 33)
- Admission/Encounter for treatment of secondary site (page 33)
- Coding and sequencing of complications (page 34)
- Primary malignancy previously excised (page 34)
- Admissions/Encounters involving antineoplastic chemotherapy, immunotherapy and radiation therapy (page 35)
- Admission/encounter to determine extent of malignancy (page 36)
- Symptoms, signs, and abnormal findings listed in Chapter 18 associated with neoplasms (page 36)
- Admission/encounter for pain control/management (page 36)
All codes under C56
C56 can't be used on a claim. Pick a billable code below; grey headings group them.
C56 MS-DRGs
As the principal diagnosis, all 4 billable codes under C56 group to MS-DRG 731, 732, 733, 754, 755, or 756 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 731 Uterine and Adnexa Procedures for Malignancy with MCC
- DRG 732 Uterine and Adnexa Procedures for Malignancy with CC
- DRG 733 Uterine and Adnexa Procedures for Malignancy without CC/MCC
- DRG 754 Malignancy, Female Reproductive System with MCC
- DRG 755 Malignancy, Female Reproductive System with CC
- DRG 756 Malignancy, Female Reproductive System without CC/MCC
Other codes that refer to C56
Notes on these codes point to C56.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about ovarian cancer on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.