C56 – Malignant neoplasm of ovary
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of female genital organs
ICD-10-CM code
C56
- Code
C56(claims format:C56)- Description
- Malignant neoplasm of ovary
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C51-C58 Malignant neoplasms of female genital organs
Billable codes under C56
C56 is a header code and cannot be used on claims. Choose the most specific code:
Notes for C56
Use additional code:
- code to identify any functional activity
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block C51-C58
Includes:
- malignant neoplasm of skin of female genital organs
Index terms for C56
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Thecoma, malignant
- Carcinoma, theca cell
- Brenner, tumor, malignant
- Carcinoma, granulosa cell
- Tumor, Brenner, malignant
- Tumor, granulosa cell, malignant
- Adenofibroma, endometrioid, malignant
- Dermoid, with malignant transformation
- Cystadenofibroma, endometrioid, malignant
- Tumor, granulosa cell-theca cell, malignant
- Cyst, dermoid, with malignant transformation
- Tumor, dermoid, with malignant transformation
- Tumor, endodermal sinus, unspecified site, female
- Cystadenoma, serous, borderline malignancy, ovary
- Teratoma, ovary, embryonal, immature or malignant
- Cystadenoma, mucinous, borderline malignancy, ovary
- Cystadenoma, papillary, borderline malignancy, ovary
- Tumor, papillary, mucinous of low malignant potential
- Leydig cell, tumor, malignant, unspecified site, female
- Cystadenoma, pseudomucinous, borderline malignancy, ovary
- Cystadenoma, serous, papillary, borderline malignancy, ovary
- Cystadenoma, papillary, serous, borderline malignancy, ovary
- Cystadenoma, papillary, mucinous, borderline malignancy, ovary
- Cystadenoma, mucinous, papillary, borderline malignancy, ovary
- Cystadenoma, pseudomucinous, papillary, borderline malignancy, ovary
Frequently asked questions
What is ICD-10 code C56?
C56 is the ICD-10-CM code for malignant neoplasm of ovary, in the block C51-C58 (Malignant neoplasms of female genital organs).
Is C56 a billable code?
No. C56 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.