ICD-10-CM 2027
ICD-10 code for ovarian cancer
C56.9
Malignant neoplasm of unspecified ovary
From the official ICD-10-CM alphabetic index entry “Cancer › ovarian”. Page updated September 29, 2026.
About coding ovarian cancer
The ICD-10-CM code for ovarian cancer is C56.9 (Malignant neoplasm of unspecified ovary).
Within C56, choose C56.9 (unspecified ovary) only when documentation doesn't support a more specific option: right ovary (C56.1), left ovary (C56.2) and bilateral ovaries (C56.3).
Use an additional code to identify any functional activity.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Common questions about ovarian cancer ICD-10 codes
What is the ICD-10 code for ovarian cancer?
- C56.9 — Malignant neoplasm of unspecified ovary.
Is C56.9 billable?
- Yes. C56.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can C56.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict C56.9 as a principal diagnosis.
Is C56.9 a CC or MCC?
- C56.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.