C79.9 – Secondary malignant neoplasm of unspecified site
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of ill-defined, other secondary and unspecified sites
- Code
C79.9(claims format:C799)- Description
- Secondary malignant neoplasm of unspecified site
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C76-C80 Malignant neoplasms of ill-defined, other secondary and unspecified sites
- Parent codes
- C79
Notes for C79.9
- Metastatic cancer NOS
- Metastatic disease NOS
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
C79 – Secondary malignant neoplasm of other and unspecified sites
Index terms for C79.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in C79
- C79.0 – Secondary malignant neoplasm of kidney and renal pelvisHeader
- C79.1 – Secondary malignant neoplasm of bladder and other and unspecified urinary organsHeader
- C79.2 – Secondary malignant neoplasm of skinBillable
- C79.3 – Secondary malignant neoplasm of brain and cerebral meningesHeader
- C79.4 – Secondary malignant neoplasm of other and unspecified parts of nervous systemHeader
- C79.5 – Secondary malignant neoplasm of bone and bone marrowHeader
- C79.6 – Secondary malignant neoplasm of ovaryHeader
- C79.7 – Secondary malignant neoplasm of adrenal glandHeader
- C79.8 – Secondary malignant neoplasm of other specified sitesHeader
Frequently asked questions
What is ICD-10 code C79.9?
C79.9 is the ICD-10-CM code for secondary malignant neoplasm of unspecified site, in the block C76-C80 (Malignant neoplasms of ill-defined, other secondary and unspecified sites).
Is C79.9 a billable code?
Yes. C79.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does C79.9 belong to?
It belongs to category C79 – Secondary malignant neoplasm of other and unspecified sites.
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.