2019 ICD-10-CM Diagnosis Code C56.9

Malignant neoplasm of unspecified ovary

    2016 2017 2018 2019 Billable/Specific Code Female Dx
  • C56.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM C56.9 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of C56.9 - other international versions of ICD-10 C56.9 may differ.
ICD-10-CM Coding Rules
  • C56.9 is applicable to female patients.
The following code(s) above C56.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C56.9:
  • C00-D49
    2019 ICD-10-CM Range C00-D49

    Neoplasms

    Note
    • Functional activity
    • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
    • Morphology [Histology]
    • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
    • Primary malignant neoplasms overlapping site boundaries
    • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
    • Malignant neoplasm of ectopic tissue
    • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
    Neoplasms
  • C51-C58
    2019 ICD-10-CM Range C51-C58

    Malignant neoplasms of female genital organs

    Includes
    • malignant neoplasm of skin of female genital organs
    Malignant neoplasms of female genital organs
  • C56
    ICD-10-CM Diagnosis Code C56

    Malignant neoplasm of ovary

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Use Additional
    • code to identify any functional activity
    Malignant neoplasm of ovary
Approximate Synonyms
  • Cancer of the ovary
  • Cancer of the ovary with peritoneal metastases
  • Cancer of the ovary, disseminated
  • Cancer of the ovary, endometrioid
  • Cancer of the ovary, germ cell tumor
  • Cancer of the ovary, mixed mullerian
  • Cancer of the ovary, mucinous cystadenoca
  • Cancer of the ovary, mucinous cystadenocarcinoma
  • Cancer of the ovary, papillary serous cystadenoca
  • Cancer of the ovary, papillary serous cystadenocarcinoma
  • Cancer of the ovary, primary
  • Cancer of the ovary, sarcoma
  • Cancer of the ovary, sex chord tumor
  • Cancer of the ovary, stage 1
  • Cancer of the ovary, stage 2
  • Cancer of the ovary, stage 3
  • Cancer of the ovary, stage 4
  • Cancer of the ovary, undifferentiated
  • Carcinoma of ovary, stage 1
  • Carcinoma of ovary, stage 2
  • Carcinoma of ovary, stage 3
  • Carcinoma of ovary, stage 4
  • Endometrioid carcinoma ovary
  • Germ cell tumor of ovary
  • Malignant germ cell tumor of ovary
  • Mucinous cystadenocarcinoma of ovary
  • Ovarian cancer
  • Ovarian cancer metastatic to peritoneum
  • Ovarian cancer, disseminated
  • Primary malignant neoplasm of ovary
  • Primary malignant tumor of ovary of mixed mullerian type
  • Sarcoma of ovary
  • Sarcoma, ovary
  • Serous papillary cystadenocarcinoma ovary
  • Sex cord tumor of ovary
  • Undifferentiated carcinoma of ovary
ICD-10-CM C56.9 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 736 Uterine and adnexa procedures for ovarian or adnexal malignancy with mcc
  • 737 Uterine and adnexa procedures for ovarian or adnexal malignancy with cc
  • 738 Uterine and adnexa procedures for ovarian or adnexal malignancy without cc/mcc
  • 739 Uterine, adnexa procedures for non-ovarian and non-adnexal malignancy with mcc
  • 740 Uterine, adnexa procedures for non-ovarian and non-adnexal malignancy with cc
  • 741 Uterine, adnexa procedures for non-ovarian and non-adnexal malignancy without cc/mcc
  • 754 Malignancy, female reproductive system with mcc
  • 755 Malignancy, female reproductive system with cc
  • 756 Malignancy, female reproductive system without cc/mcc

Convert C56.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change

Diagnosis Index entries containing back-references to C56.9:

ICD-10-CM Codes Adjacent To C56.9
C54.0 Malignant neoplasm of isthmus uteri
C54.1 Malignant neoplasm of endometrium
C54.2 Malignant neoplasm of myometrium
C54.3 Malignant neoplasm of fundus uteri
C54.8 Malignant neoplasm of overlapping sites of corpus uteri
C54.9 Malignant neoplasm of corpus uteri, unspecified
C55 Malignant neoplasm of uterus, part unspecified
C56 Malignant neoplasm of ovary
C56.1 Malignant neoplasm of right ovary
C56.2 Malignant neoplasm of left ovary
C56.9 Malignant neoplasm of unspecified ovary
C57 Malignant neoplasm of other and unspecified female genital organs
C57.0 Malignant neoplasm of fallopian tube
C57.00 Malignant neoplasm of unspecified fallopian tube
C57.01 Malignant neoplasm of right fallopian tube
C57.02 Malignant neoplasm of left fallopian tube
C57.1 Malignant neoplasm of broad ligament
C57.10 Malignant neoplasm of unspecified broad ligament
C57.11 Malignant neoplasm of right broad ligament
C57.12 Malignant neoplasm of left broad ligament
C57.2 Malignant neoplasm of round ligament

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.