C56 — Malignant neoplasm of ovary
Is C56 billable?
No — C56 is a non-billable header code. C56 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath C56.
C56 at a glance
| Code | C56 |
|---|---|
| Description | Malignant neoplasm of ovary |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is C56 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to C56. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Carcinoma › granulosa cell (malignant)
- Dermoid › with malignant transformation (cyst)
- Thecoma › malignant
- Adenofibroma › endometrioid › malignant
- Brenner › tumor › malignant
- Teratoma › ovary › embryonal, immature or malignant (solid)
- Tumor › Brenner › malignant
- Tumor › dermoid › with malignant transformation
- Tumor › granulosa cell › malignant
- Tumor › granulosa cell-theca cell › malignant
- Tumor › papillary › mucinous of low malignant potential
Use additional code
Report an additional code alongside C56 to fully describe the condition. C56 is sequenced first.
- code to identify any functional activity
What codes fall under C56? (4)
How long has C56 existed?
C56 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with C56?
ICD-10-CM declares these codes mutually exclusive with C56 — exactly one of each pair can be correct for a given encounter.